alphaproteobacteria

Summary

Summary: A class in the phylum PROTEOBACTERIA comprised mostly of two major phenotypes: purple non-sulfur bacteria and aerobic bacteriochlorophyll-containing bacteria.

Top Publications

  1. Thrash J, Boyd A, Huggett M, Grote J, Carini P, Yoder R, et al. Phylogenomic evidence for a common ancestor of mitochondria and the SAR11 clade. Sci Rep. 2011;1:13 pubmed publisher
    Mitochondria share a common ancestor with the Alphaproteobacteria, but determining their precise origins is challenging due to inherent difficulties in phylogenetically reconstructing ancient evolutionary events...
  2. Dergousoff S, Chilton N. Novel genotypes of Anaplasma bovis, "Candidatus Midichloria" sp. and Ignatzschineria sp. in the Rocky Mountain wood tick, Dermacentor andersoni. Vet Microbiol. 2011;150:100-6 pubmed publisher
    ..Further investigations are needed to determine the prevalence, reservoir hosts, and pathogenicity of the Canadian genotype of A. bovis...
  3. Smith D, Kitner J, Norbeck A, Clauss T, Lipton M, Schwalbach M, et al. Transcriptional and translational regulatory responses to iron limitation in the globally distributed marine bacterium Candidatus pelagibacter ubique. PLoS ONE. 2010;5:e10487 pubmed publisher
    ..We propose a model in which the RNA-binding activity of CspE and CspL selectively enables protein synthesis of the iron acquisition protein SfuC during transient growth-limiting episodes of iron scarcity...
  4. Fioravanti A, Fumeaux C, Mohapatra S, Bompard C, Brilli M, Frandi A, et al. DNA binding of the cell cycle transcriptional regulator GcrA depends on N6-adenosine methylation in Caulobacter crescentus and other Alphaproteobacteria. PLoS Genet. 2013;9:e1003541 pubmed publisher
    ..cell cycle regulator GcrA and the N6-adenosine methyltransferase CcrM, both highly conserved proteins among Alphaproteobacteria, that are activated early and at the end of S-phase, respectively...
  5. Ulmschneider M, Bagneris C, McCusker E, DeCaen P, Delling M, Clapham D, et al. Molecular dynamics of ion transport through the open conformation of a bacterial voltage-gated sodium channel. Proc Natl Acad Sci U S A. 2013;110:6364-9 pubmed publisher
    ..These studies simulate sodium channel conductance based on an experimentally determined structure of a sodium channel pore that has a completely open transmembrane pathway and activation gate...
  6. Dziewit L, Baj J, Szuplewska M, Maj A, Tabin M, Czyzkowska A, et al. Insights into the transposable mobilome of Paracoccus spp. (Alphaproteobacteria). PLoS ONE. 2012;7:e32277 pubmed publisher
    ..to identify a pool of functional transposable elements (TEs) residing in bacteria of the genus Paracoccus (Alphaproteobacteria)...
  7. Giovannoni S, Vergin K. Seasonality in ocean microbial communities. Science. 2012;335:671-6 pubmed publisher
    ..These developments will enable marine scientists to predict changes in geochemical cycles mediated by microbial communities and to gauge their broader impacts...
  8. Smorawinska M, Szuplewska M, Zaleski P, Wawrzyniak P, Maj A, Plucienniczak A, et al. Mobilizable narrow host range plasmids as natural suicide vectors enabling horizontal gene transfer among distantly related bacterial species. FEMS Microbiol Lett. 2012;326:76-82 pubmed publisher
    ..and pIGRK), which could be maintained in several closely related species of Gammaproteobacteria, but not in Alphaproteobacteria. The plasmids contain different mobilization systems (MOB), whose activity in Escherichia coli was ..
  9. Georgiades K, Madoui M, Le P, Robert C, Raoult D. Phylogenomic analysis of Odyssella thessalonicensis fortifies the common origin of Rickettsiales, Pelagibacter ubique and Reclimonas americana mitochondrion. PLoS ONE. 2011;6:e24857 pubmed publisher
    The evolution of the Alphaproteobacteria and origin of the mitochondria are topics of considerable debate. Most studies have placed the mitochondria ancestor within the Rickettsiales order...

More Information

Publications74

  1. Viklund J, Ettema T, Andersson S. Independent genome reduction and phylogenetic reclassification of the oceanic SAR11 clade. Mol Biol Evol. 2012;29:599-615 pubmed publisher
    ..Pelagibacter ubique is most closely related to soil and aquatic Alphaproteobacteria with large genomes...
  2. Salcher M, Pernthaler J, Posch T. Seasonal bloom dynamics and ecophysiology of the freshwater sister clade of SAR11 bacteria 'that rule the waves' (LD12). ISME J. 2011;5:1242-52 pubmed publisher
    b>Alphaproteobacteria are common members of marine bacterioplankton assemblages, but are believed to be rare in lacustrine systems...
  3. Brilli M, Fondi M, Fani R, Mengoni A, Ferri L, Bazzicalupo M, et al. The diversity and evolution of cell cycle regulation in alpha-proteobacteria: a comparative genomic analysis. BMC Syst Biol. 2010;4:52 pubmed publisher
    ..Although the circuitry regulating CtrA is known in molecular detail in Caulobacter, its conservation and functionality in the other alpha-proteobacteria are still poorly understood...
  4. Oh H, Kwon K, Kang I, Kang S, Lee J, Kim S, et al. Complete genome sequence of "Candidatus Puniceispirillum marinum" IMCC1322, a representative of the SAR116 clade in the Alphaproteobacteria. J Bacteriol. 2010;192:3240-1 pubmed publisher
    ..Puniceispirillum marinum" IMCC1322, the first cultured representative of the SAR116 clade in the Alphaproteobacteria, is reported here...
  5. Rodpothong P, Sullivan J, Songsrirote K, Sumpton D, Cheung K, Thomas Oates J, et al. Nodulation gene mutants of Mesorhizobium loti R7A-nodZ and nolL mutants have host-specific phenotypes on Lotus spp. Mol Plant Microbe Interact. 2009;22:1546-54 pubmed publisher
    ..Overall the results reveal differences in the sensitivity of plant perception with respect to signaling leading to root hair deformation and nodule primordium development versus infection thread formation and rhizobial entry...
  6. Lami R, Cottrell M, Campbell B, Kirchman D. Light-dependent growth and proteorhodopsin expression by Flavobacteria and SAR11 in experiments with Delaware coastal waters. Environ Microbiol. 2009;11:3201-9 pubmed publisher
    ..Collectively, these data suggest that light affects growth of PR-containing bacteria and regulation of PR mRNA synthesis in natural communities...
  7. Huang S, Zhang Y, Chen F, Jiao N. Complete genome sequence of a marine roseophage provides evidence into the evolution of gene transfer agents in alphaproteobacteria. Virol J. 2011;8:124 pubmed publisher
    ..The complete genome of RDJL?1 provides evidence into the hypothesis that extant RcGTA may be a prophage remnant...
  8. Collier J. Epigenetic regulation of the bacterial cell cycle. Curr Opin Microbiol. 2009;12:722-9 pubmed publisher
    ..In gamma-proteobacteria, most GATC sites are only transiently hemi-methylated, except regulatory GATC sites that are protected from Dam methylation by specific DNA-binding proteins...
  9. Wang Z, Kadouri D, Wu M. Genomic insights into an obligate epibiotic bacterial predator: Micavibrio aeruginosavorus ARL-13. BMC Genomics. 2011;12:453 pubmed publisher
    ..Although bacterial predators play important roles in the dynamics of natural microbial communities, little is known about the molecular mechanism of bacterial predation and the evolution of diverse predatory lifestyles...
  10. Beninati T, Riegler M, Vilcins I, Sacchi L, McFadyen R, Krockenberger M, et al. Absence of the symbiont Candidatus Midichloria mitochondrii in the mitochondria of the tick Ixodes holocyclus. FEMS Microbiol Lett. 2009;299:241-7 pubmed publisher
    ..mitochondrii strains; however, no bacteria were seen in the mitochondria. Comparative studies involving these strains may shed light on the unique phenomenon of mitochondrial invasion...
  11. Dashiff A, Keeling T, Kadouri D. Inhibition of predation by Bdellovibrio bacteriovorus and Micavibrio aeruginosavorus via host cell metabolic activity in the presence of carbohydrates. Appl Environ Microbiol. 2011;77:2224-31 pubmed publisher
    ..The data presented here might be of value when storing, growing, and cultivating predatory bacteria, as well as when considering environmental conditions that might influence predation in the field...
  12. Zhang X, Ren W, DeCaen P, Yan C, Tao X, Tang L, et al. Crystal structure of an orthologue of the NaChBac voltage-gated sodium channel. Nature. 2012;486:130-4 pubmed publisher
    ..We propose that Na(v)Rh is in an 'inactivated' conformation. Comparison of Na(v)Rh with Na(v)Ab reveals considerable conformational rearrangements that may underlie the electromechanical coupling mechanism of voltage-gated channels...
  13. Rodriguez Ezpeleta N, Embley T. The SAR11 group of alpha-proteobacteria is not related to the origin of mitochondria. PLoS ONE. 2012;7:e30520 pubmed publisher
    ..In addition, our analyses raise doubts about the monophyly of the newly proposed Pelagibacteraceae family...
  14. Carini P, Steindler L, Beszteri S, Giovannoni S. Nutrient requirements for growth of the extreme oligotroph 'Candidatus Pelagibacter ubique' HTCC1062 on a defined medium. ISME J. 2013;7:592-602 pubmed publisher
  15. Li S, Tang Y, Nie Y, Cai M, Wu X. Complete genome sequence of Polymorphum gilvum SL003B-26A1T, a crude oil-degrading bacterium from oil-polluted saline soil. J Bacteriol. 2011;193:2894-5 pubmed publisher
    ..Here we report the complete genome of SL003B-26A1(T) and the genes likely to be involved in oil degradation and ecological adaption...
  16. Greene S, Brilli M, Biondi E, Komeili A. Analysis of the CtrA pathway in Magnetospirillum reveals an ancestral role in motility in alphaproteobacteria. J Bacteriol. 2012;194:2973-86 pubmed publisher
    ..In this work, we probed the role of the CtrA regulatory network, conserved throughout the Alphaproteobacteria, in the magnetotactic bacterium Magnetospirillum magneticum strain AMB-1, which possesses unique ..
  17. Albuquerque L, Rainey F, Pena A, Tiago I, Veríssimo A, Nobre M, et al. Tepidamorphus gemmatus gen. nov., sp. nov., a slightly thermophilic member of the Alphaproteobacteria. Syst Appl Microbiol. 2010;33:60-6 pubmed publisher
  18. Matsuura Y, Kikuchi Y, Meng X, Koga R, Fukatsu T. Novel clade of alphaproteobacterial endosymbionts associated with stinkbugs and other arthropods. Appl Environ Microbiol. 2012;78:4149-56 pubmed publisher
    ..343 individuals representing 24 populations of four Nysius species revealed overall detection rates of the alphaproteobacteria at 77.6% in Nysius plebeius, 87.7% in Nysius sp. 1, 81.0% in Nysius sp. 2, and 100% in Nysius expressus...
  19. Dziewit L, Adamczuk M, Szuplewska M, Bartosik D. DIY series of genetic cassettes useful in construction of versatile vectors specific for Alphaproteobacteria. J Microbiol Methods. 2011;86:166-74 pubmed publisher
    ..Do It Yourself) series of genetic cassettes, which facilitate construction of novel versatile vectors for Alphaproteobacteria. All the cassettes are based on defined genetic modules derived from three natural plasmids of Paracoccus ..
  20. Oh H, Kang I, Vergin K, Kang D, Rhee K, Giovannoni S, et al. Complete genome sequence of strain HTCC2503T of Parvularcula bermudensis, the type species of the order "Parvularculales" in the class Alphaproteobacteria. J Bacteriol. 2011;193:305-6 pubmed publisher
    The order "Parvularculales" represents the seventh order in the class Alphaproteobacteria. Parvularcula bermudensis, the type species of the order, was isolated from the Sargasso Sea using dilution-to-extinction culturing...
  21. Coleman M, Chisholm S. Ecosystem-specific selection pressures revealed through comparative population genomics. Proc Natl Acad Sci U S A. 2010;107:18634-9 pubmed publisher
    ..These findings implicate phosphorus availability as the dominant selective force driving divergence between these populations, and demonstrate the promise of this approach for revealing selective agents in more complex microbial systems...
  22. Steindler L, Schwalbach M, Smith D, Chan F, Giovannoni S. Energy starved Candidatus Pelagibacter ubique substitutes light-mediated ATP production for endogenous carbon respiration. PLoS ONE. 2011;6:e19725 pubmed publisher
    ..These findings show that PR is a vital adaptation that supports Cand. P. ubique metabolism during carbon starvation, a condition that is likely to occur in the extreme conditions of ocean environments...
  23. Brindefalk B, Ettema T, Viklund J, Thollesson M, Andersson S. A phylometagenomic exploration of oceanic alphaproteobacteria reveals mitochondrial relatives unrelated to the SAR11 clade. PLoS ONE. 2011;6:e24457 pubmed publisher
    ..The availability of ocean metagenome data substantially increases the sampling of Alphaproteobacteria inhabiting the oxygen-containing waters of the oceans that likely resemble the originating environment of ..
  24. Bazylinski D, Williams T, Lefèvre C, Berg R, Zhang C, Bowser S, et al. Magnetococcus marinus gen. nov., sp. nov., a marine, magnetotactic bacterium that represents a novel lineage (Magnetococcaceae fam. nov., Magnetococcales ord. nov.) at the base of the Alphaproteobacteria. Int J Syst Evol Microbiol. 2013;63:801-8 pubmed publisher
    ..nov.) and family (Magnetococcaceae fam. nov.) are proposed for the reception of Magnetococcus and related magnetotactic cocci, which are provisionally included in the Alphaproteobacteria as the most basal known lineage of this class.
  25. Dashiff A, Junka R, Libera M, Kadouri D. Predation of human pathogens by the predatory bacteria Micavibrio aeruginosavorus and Bdellovibrio bacteriovorus. J Appl Microbiol. 2011;110:431-44 pubmed publisher
    ..The focus of this study was to evaluate the potential use of the predatory bacteria Bdellovibrio bacteriovorus and Micavibrio aeruginosavorus to control the pathogens associated with human infection...
  26. Epis S, Mandrioli M, Genchi M, Montagna M, Sacchi L, Pistone D, et al. Localization of the bacterial symbiont Candidatus Midichloria mitochondrii within the hard tick Ixodes ricinus by whole-mount FISH staining. Ticks Tick Borne Dis. 2013;4:39-45 pubmed publisher
    ..Cellular localization and quantification of the symbionts were also assessed with electron microscopy and specific real-time PCR, respectively...
  27. Kunihiro T, Takasu H, Miyazaki T, Uramoto Y, Kinoshita K, Yodnarasri S, et al. Increase in Alphaproteobacteria in association with a polychaete, Capitella sp. I, in the organically enriched sediment. ISME J. 2011;5:1818-31 pubmed publisher
    ..In particular, ubiquinone-10, which is present in members of the class Alphaproteobacteria, increased in the sediment with dense patches of the Capitella...
  28. Brown M, Lauro F, DeMaere M, Muir L, Wilkins D, Thomas T, et al. Global biogeography of SAR11 marine bacteria. Mol Syst Biol. 2012;8:595 pubmed publisher
    ..Our data demonstrate the importance of adaptive radiation in the organism's ability to proliferate throughout the world's oceans, and describe genomic traits characteristic of different phylotypes in specific marine biomes...
  29. Montagna M, Sassera D, Epis S, Bazzocchi C, Vannini C, Lo N, et al. "Candidatus Midichloriaceae" fam. nov. (Rickettsiales), an ecologically widespread clade of intracellular alphaproteobacteria. Appl Environ Microbiol. 2013;79:3241-8 pubmed publisher
  30. Campagne S, Damberger F, Kaczmarczyk A, Francez Charlot A, Allain F, Vorholt J. Structural basis for sigma factor mimicry in the general stress response of Alphaproteobacteria. Proc Natl Acad Sci U S A. 2012;109:E1405-14 pubmed publisher
    ..Recently, the general stress response sigma factor in Alphaproteobacteria, ?(EcfG), was identified...
  31. Abhishek A, Bavishi A, Bavishi A, Choudhary M. Bacterial genome chimaerism and the origin of mitochondria. Can J Microbiol. 2011;57:49-61 pubmed publisher
    Many studies have sought to determine the origin and evolution of mitochondria. Although the Alphaproteobacteria are thought to be the closest relatives of the mitochondrial progenitor, there is dispute as to what its particular sister ..
  32. Sun J, Steindler L, Thrash J, Halsey K, Smith D, Carter A, et al. One carbon metabolism in SAR11 pelagic marine bacteria. PLoS ONE. 2011;6:e23973 pubmed publisher
    The SAR11 Alphaproteobacteria are the most abundant heterotrophs in the oceans and are believed to play a major role in mineralizing marine dissolved organic carbon...
  33. Chen Y, Patel N, Crombie A, Scrivens J, Murrell J. Bacterial flavin-containing monooxygenase is trimethylamine monooxygenase. Proc Natl Acad Sci U S A. 2011;108:17791-6 pubmed publisher
    ..silvestris to grow on TMA as a sole carbon and energy source. Close homologs of tmm occur in many Alphaproteobacteria, in particular Rhodobacteraceae (marine Roseobacter clade, MRC) and the marine SAR11 clade (Pelagibacter ..
  34. Poiata E, Meyer M, Ames T, Breaker R. A variant riboswitch aptamer class for S-adenosylmethionine common in marine bacteria. RNA. 2009;15:2046-56 pubmed publisher
    ..This tandem riboswitch arrangement exhibits an architecture that can potentially control both the transcriptional and translational stages of gene expression...
  35. Mariconti M, Epis S, Sacchi L, Biggiogera M, Sassera D, Genchi M, et al. A study on the presence of flagella in the order Rickettsiales: the case of 'Candidatus Midichloria mitochondrii'. Microbiology. 2012;158:1677-83 pubmed publisher
    ..M. mitochondrii'...
  36. Fukuda W, Yamada K, Miyoshi Y, Okuno H, Atomi H, Imanaka T. Rhodoligotrophos appendicifer gen. nov., sp. nov., an appendaged bacterium isolated from a freshwater Antarctic lake. Int J Syst Evol Microbiol. 2012;62:1945-50 pubmed publisher
    ..nov., in the order Rhizobiales, family Rhodobiaceae. The name Rhodoligotrophos appendicifer gen. nov. sp. nov. is proposed as the type species of this new genus, with 120-1(T) (?=?JCM 16873(T)?=?ATCC BAA-2115(T)) as the type strain...
  37. Castillo Ramírez S, Vázquez Castellanos J, Gonzalez V, Cevallos M. Horizontal gene transfer and diverse functional constrains within a common replication-partitioning system in Alphaproteobacteria: the repABC operon. BMC Genomics. 2009;10:536 pubmed publisher
    The repABC plasmid family, which is extensively present within Alphaproteobacteria, and some secondary chromosomes of the Rhizobiales have the particular feature that all the elements involved in replication and partitioning reside ..
  38. Dick G, Podell S, Johnson H, Rivera Espinoza Y, Bernier Latmani R, McCarthy J, et al. Genomic insights into Mn(II) oxidation by the marine alphaproteobacterium Aurantimonas sp. strain SI85-9A1. Appl Environ Microbiol. 2008;74:2646-58 pubmed publisher
    ..Overall, our results provide novel insights into the physiology and biochemistry of Mn(II) oxidation and reveal a genome specialized for life at the oxic/anoxic interface. ..
  39. Alexandre A, Laranjo M, Young J, Oliveira S. dnaJ is a useful phylogenetic marker for alphaproteobacteria. Int J Syst Evol Microbiol. 2008;58:2839-49 pubmed publisher
    ..In this study, the dnaJ chaperone gene was investigated as a marker for phylogeny studies in alphaproteobacteria. Preliminary analysis of G+C contents and G+C3s contents (the G+C content of the synonymous third codon ..
  40. Vergin K, Tripp H, Wilhelm L, Denver D, Rappé M, Giovannoni S. High intraspecific recombination rate in a native population of Candidatus pelagibacter ubique (SAR11). Environ Microbiol. 2007;9:2430-40 pubmed
    ..The eukaryotic model of species sharing a common pool of alleles is more apt for this SAR11 population than a strictly clonal model of inheritance in which allelic diversity is controlled by periodic selection. ..
  41. Miwa H, Sun J, Oldroyd G, Downie J. Analysis of Nod-factor-induced calcium signaling in root hairs of symbiotically defective mutants of Lotus japonicus. Mol Plant Microbe Interact. 2006;19:914-23 pubmed
    ..We propose that increased bacterial numbers within infection foci in root hairs leads to accumulation of Nod factor to sufficient levels to activate the calcium flux, and this may drive infection thread growth. ..
  42. Corbino K, Barrick J, Lim J, Welz R, Tucker B, Puskarz I, et al. Evidence for a second class of S-adenosylmethionine riboswitches and other regulatory RNA motifs in alpha-proteobacteria. Genome Biol. 2005;6:R70 pubmed
    ..The two SAM riboswitches might be 'RNA World' relics that were selectively retained in certain bacterial lineages or new motifs that have emerged since the divergence of the major bacterial groups. ..
  43. Giovannoni S, Bibbs L, Cho J, Stapels M, Desiderio R, Vergin K, et al. Proteorhodopsin in the ubiquitous marine bacterium SAR11. Nature. 2005;438:82-5 pubmed
    ..The gene is expressed by cells grown in either diurnal light or in darkness, and there is no difference between the growth rates or cell yields of cultures grown in light or darkness. ..
  44. MacLellan S, Smallbone L, Sibley C, Finan T. The expression of a novel antisense gene mediates incompatibility within the large repABC family of alpha-proteobacterial plasmids. Mol Microbiol. 2005;55:611-23 pubmed
    ..This gene, that we have named incA, is transcribed antisense to the repABC genes. Our analysis suggests that the incA gene is conserved in repABC loci from a diverse spectrum of bacteria. ..
  45. Atteia A, Adrait A, Brugière S, Tardif M, van Lis R, Deusch O, et al. A proteomic survey of Chlamydomonas reinhardtii mitochondria sheds new light on the metabolic plasticity of the organelle and on the nature of the alpha-proteobacterial mitochondrial ancestor. Mol Biol Evol. 2009;26:1533-48 pubmed publisher
  46. Gilbert J, Muhling M, Joint I. A rare SAR11 fosmid clone confirming genetic variability in the 'Candidatus Pelagibacter ubique' genome. ISME J. 2008;2:790-3 pubmed publisher
    ..Variation in SAR11 genomes from different locations might explain why SAR11 is abundant in so many diverse marine provinces. ..
  47. Davidov Y, Huchon D, Koval S, Jurkevitch E. A new alpha-proteobacterial clade of Bdellovibrio-like predators: implications for the mitochondrial endosymbiotic theory. Environ Microbiol. 2006;8:2179-88 pubmed
    ..We here propose a scenario based on the BALO feeding-mode to hypothesize a mechanism at play at the origin of the mitochondrial endosymbiosis...
  48. Murray J, Karas B, Sato S, Tabata S, Amyot L, Szczyglowski K. A cytokinin perception mutant colonized by Rhizobium in the absence of nodule organogenesis. Science. 2007;315:101-4 pubmed
    ..We demonstrated that the corresponding gene encodes a cytokinin receptor that is required for the activation of the nodule inception regulator Nin and nodule organogenesis. ..
  49. Alonso Sáez L, Gasol J. Seasonal variations in the contributions of different bacterial groups to the uptake of low-molecular-weight compounds in northwestern Mediterranean coastal waters. Appl Environ Microbiol. 2007;73:3528-35 pubmed
    ..not very active in the uptake of glucose at any time of the year (<10% of cells were active) compared to Alphaproteobacteria (generally >20% of cells were active)...
  50. Lo N, Beninati T, Sassera D, Bouman E, Santagati S, Gern L, et al. Widespread distribution and high prevalence of an alpha-proteobacterial symbiont in the tick Ixodes ricinus. Environ Microbiol. 2006;8:1280-7 pubmed
    ..To our knowledge, IricES1 is the most widespread and highly prevalent of any tick-associated symbiont...
  51. Lohr J, Chen F, Hill R. Genomic analysis of bacteriophage PhiJL001: insights into its interaction with a sponge-associated alpha-proteobacterium. Appl Environ Microbiol. 2005;71:1598-609 pubmed
    ..The unique marine phage-host system described here provides a model system for studying the role of phages in sponge microbial communities...
  52. Reisch C, Moran M, Whitman W. Dimethylsulfoniopropionate-dependent demethylase (DmdA) from Pelagibacter ubique and Silicibacter pomeroyi. J Bacteriol. 2008;190:8018-24 pubmed publisher
    ..pomeroyi DSS-3 was 70 mM. These results suggest that marine bacterioplankton may actively accumulate DMSP to osmotically significant concentrations that favor near-maximal rates of DMSP demethylation activity...
  53. Kwon K, Lee H, Yang S, Kim S. Kordiimonas gwangyangensis gen. nov., sp. nov., a marine bacterium isolated from marine sediments that forms a distinct phyletic lineage (Kordiimonadales ord. nov.) in the 'Alphaproteobacteria'. Int J Syst Evol Microbiol. 2005;55:2033-7 pubmed
    ..that the isolate forms a phyletic lineage that is distinct from the seven known orders within the 'Alphaproteobacteria'...
  54. Moeseneder M, Arrieta J, Herndl G. A comparison of DNA- and RNA-based clone libraries from the same marine bacterioplankton community. FEMS Microbiol Ecol. 2005;51:341-52 pubmed
  55. Elifantz H, Malmstrom R, Cottrell M, Kirchman D. Assimilation of polysaccharides and glucose by major bacterial groups in the Delaware Estuary. Appl Environ Microbiol. 2005;71:7799-805 pubmed
    ..Actinobacteria contributed 70% to glucose assimilation in freshwater, while Alphaproteobacteria assimilated 60% of this compound in saline water...
  56. Wichels A, Würtz S, Döpke H, Schütt C, Gerdts G. Bacterial diversity in the breadcrumb sponge Halichondria panicea (Pallas). FEMS Microbiol Ecol. 2006;56:102-18 pubmed
    ..A PCR-DGGE specific for the Roseobacter group of marine Alphaproteobacteria displayed low diversity and a marked similarity between all samples...
  57. Williams K, Sobral B, Dickerman A. A robust species tree for the alphaproteobacteria. J Bacteriol. 2007;189:4578-86 pubmed
    ..A species tree for 72 alphaproteobacteria was produced from a concatenation of alignments for 104 well-behaved protein families...
  58. Wang C, Sobral B, Williams K. Loss of a universal tRNA feature. J Bacteriol. 2007;189:1954-62 pubmed
    ..Parvularculales, and Pelagibacter generally fail to encode this extra guanylate, unlike those of other alphaproteobacteria and bacteria in general...
  59. Urdiain M, Lopez Lopez A, Gonzalo C, Busse H, Langer S, Kampfer P, et al. Reclassification of Rhodobium marinum and Rhodobium pfennigii as Afifella marina gen. nov. comb. nov. and Afifella pfennigii comb. nov., a new genus of photoheterotrophic Alphaproteobacteria and emended descriptions of Rhodobium, Rhodobium orientis a. Syst Appl Microbiol. 2008;31:339-51 pubmed publisher
    ..Due to this reason, it is not proposed to reclassify the species...
  60. Gatsos X, Perry A, Anwari K, Dolezal P, Wolynec P, Likic V, et al. Protein secretion and outer membrane assembly in Alphaproteobacteria. FEMS Microbiol Rev. 2008;32:995-1009 pubmed publisher
    ..The Alphaproteobacteria in particular seem prone to gene loss and show the presence or absence of specific components mediating the ..
  61. Sowell S, Norbeck A, Lipton M, Nicora C, Callister S, Smith R, et al. Proteomic analysis of stationary phase in the marine bacterium "Candidatus Pelagibacter ubique". Appl Environ Microbiol. 2008;74:4091-100 pubmed publisher
  62. Stingl U, Tripp H, Giovannoni S. Improvements of high-throughput culturing yielded novel SAR11 strains and other abundant marine bacteria from the Oregon coast and the Bermuda Atlantic Time Series study site. ISME J. 2007;1:361-71 pubmed
    ..In early experiments, bacteria from the SAR11 cluster (class Alphaproteobacteria), which are presumed to be the most abundant prokaryotes on earth, were cultured...
  63. Wilhelm L, Tripp H, Givan S, Smith D, Giovannoni S. Natural variation in SAR11 marine bacterioplankton genomes inferred from metagenomic data. Biol Direct. 2007;2:27 pubmed
  64. Gupta R. Protein signatures distinctive of alpha proteobacteria and its subgroups and a model for alpha-proteobacterial evolution. Crit Rev Microbiol. 2005;31:101-35 pubmed
    ..The shared presence of many of these signatures in the mitochondrial (eukaryotic) homologs also provides evidence of the alpha-proteobacterial ancestry of mitochondria...
  65. Radutoiu S, Madsen L, Madsen E, Jurkiewicz A, Fukai E, Quistgaard E, et al. LysM domains mediate lipochitin-oligosaccharide recognition and Nfr genes extend the symbiotic host range. EMBO J. 2007;26:3923-35 pubmed
    ..We show that a single amino-acid variation in the LysM2 domain of NFR5 changes recognition of the Nod-factor synthesized by the DZL strain and suggests a possible binding site for bacterial lipochitin-oligosaccharide signal molecules...