Tomas Rezanka

Summary

Affiliation: Academy of Sciences of the Czech Republic
Country: Czech Republic

Publications

  1. Rezanka T, Sigler K. Structural analysis of a polysaccharide from Chlorella kessleri by means of gas chromatography-mass spectrometry of its saccharide alditols. Folia Microbiol (Praha). 2007;52:246-52 pubmed
    ..1H- and 13C-NMR was employed to assess the configuration of glycosidic bonds and individual monosaccharides were assigned to the L or D series by means of gas chromatography of the acetylated (S)-2-butyl glycosides. ..
  2. Rezanka T, Sigler K. Hirtusneanoside, an unsymmetrical dimeric tetrahydroxanthone from the lichen Usnea hirta. J Nat Prod. 2007;70:1487-91 pubmed
    ..Hirtusneanoside has a unique structure comprising L-rhamnopyranoside of a tetrahydroxanthone dimer and showed growth inhibitory activities against Gram-positive bacteria...
  3. Rezanka T, Siristova L, Matoulková D, Sigler K. Hydrophilic interaction liquid chromatography: ESI-MS/MS of plasmalogen phospholipids from Pectinatus bacterium. Lipids. 2011;46:765-80 pubmed publisher
    ..Major molecular species were c-p19:0/15:0 PlsEtn and PlsSer, which accounted for more than 4% of the total lipids...
  4. Rezanka T. Glycosides of polyenoic branched fatty acids from myxomycetes. Phytochemistry. 2002;60:639-46 pubmed
    ..Pers., two in A. denudata (L.) Wetts., and A. nutans (Bull.) Grev., Fuligo septica (L.) Wigg., Lycogala epidendrum (L.) Fries, Physarum polycephalum Schwein., and Trichia varia Pers. contained one of the identified glycosides each...
  5. Rezanka T, Dvoráková R, Hanus L, Dembitsky V. Enteridinines A and B from slime mold Enteridium lycoperdon. Phytochemistry. 2004;65:455-62 pubmed
    ....
  6. Rezanka T, Lukavsky J, Nedbalová L, Sigler K. Lipidomic profile in three species of dinoflagellates (Amphidinium carterae, Cystodinium sp., and Peridinium aciculiferum) containing very long chain polyunsaturated fatty acids. Phytochemistry. 2017;139:88-97 pubmed publisher
    ..g. PC, and, after further acylation, also of TAG. ..
  7. Rezanka T, Nedbalová L, Sigler K. Enantiomeric separation of triacylglycerols containing polyunsaturated fatty acids with 18 carbon atoms. J Chromatogr A. 2016;1467:261-269 pubmed publisher
    ..5 to 60‰. The ratio of regioisomers and enantiomers was found to change with increasing salinity of the culture medium. This can be explained by variable activity of acyltransferases in cells exposed to salt stress. ..
  8. Rezanka T, Kolouchová I, Sigler K. Lipidomic analysis of psychrophilic yeasts cultivated at different temperatures. Biochim Biophys Acta. 2016;1861:1634-1642 pubmed publisher
    ....
  9. Řezanka T, Lukavský J, Vítová M, Nedbalová L, Sigler K. Lipidomic analysis of Botryococcus (Trebouxiophyceae, Chlorophyta) - Identification of lipid classes containing very long chain fatty acids by offline two-dimensional LC-tandem MS. Phytochemistry. 2018;148:29-38 pubmed publisher
    ..In contrast to Botryococcus, C16, a substantially lower proportion of C18 polyunsaturated fatty acids and no VLCFAs were detected in Botryosphaerella. ..
  10. Spizek J, Rezanka T. Lincosamides: Chemical structure, biosynthesis, mechanism of action, resistance, and applications. Biochem Pharmacol. 2017;133:20-28 pubmed publisher
    ..Resistance to lincomycin and clindamycin may be caused by methylation of 23S ribosomal RNA, modification of the antibiotics by specific enzymes or active efflux from the bacterial cell. ..

Locale

Detail Information

Publications17

  1. Rezanka T, Sigler K. Structural analysis of a polysaccharide from Chlorella kessleri by means of gas chromatography-mass spectrometry of its saccharide alditols. Folia Microbiol (Praha). 2007;52:246-52 pubmed
    ..1H- and 13C-NMR was employed to assess the configuration of glycosidic bonds and individual monosaccharides were assigned to the L or D series by means of gas chromatography of the acetylated (S)-2-butyl glycosides. ..
  2. Rezanka T, Sigler K. Hirtusneanoside, an unsymmetrical dimeric tetrahydroxanthone from the lichen Usnea hirta. J Nat Prod. 2007;70:1487-91 pubmed
    ..Hirtusneanoside has a unique structure comprising L-rhamnopyranoside of a tetrahydroxanthone dimer and showed growth inhibitory activities against Gram-positive bacteria...
  3. Rezanka T, Siristova L, Matoulková D, Sigler K. Hydrophilic interaction liquid chromatography: ESI-MS/MS of plasmalogen phospholipids from Pectinatus bacterium. Lipids. 2011;46:765-80 pubmed publisher
    ..Major molecular species were c-p19:0/15:0 PlsEtn and PlsSer, which accounted for more than 4% of the total lipids...
  4. Rezanka T. Glycosides of polyenoic branched fatty acids from myxomycetes. Phytochemistry. 2002;60:639-46 pubmed
    ..Pers., two in A. denudata (L.) Wetts., and A. nutans (Bull.) Grev., Fuligo septica (L.) Wigg., Lycogala epidendrum (L.) Fries, Physarum polycephalum Schwein., and Trichia varia Pers. contained one of the identified glycosides each...
  5. Rezanka T, Dvoráková R, Hanus L, Dembitsky V. Enteridinines A and B from slime mold Enteridium lycoperdon. Phytochemistry. 2004;65:455-62 pubmed
    ....
  6. Rezanka T, Lukavsky J, Nedbalová L, Sigler K. Lipidomic profile in three species of dinoflagellates (Amphidinium carterae, Cystodinium sp., and Peridinium aciculiferum) containing very long chain polyunsaturated fatty acids. Phytochemistry. 2017;139:88-97 pubmed publisher
    ..g. PC, and, after further acylation, also of TAG. ..
  7. Rezanka T, Nedbalová L, Sigler K. Enantiomeric separation of triacylglycerols containing polyunsaturated fatty acids with 18 carbon atoms. J Chromatogr A. 2016;1467:261-269 pubmed publisher
    ..5 to 60‰. The ratio of regioisomers and enantiomers was found to change with increasing salinity of the culture medium. This can be explained by variable activity of acyltransferases in cells exposed to salt stress. ..
  8. Rezanka T, Kolouchová I, Sigler K. Lipidomic analysis of psychrophilic yeasts cultivated at different temperatures. Biochim Biophys Acta. 2016;1861:1634-1642 pubmed publisher
    ....
  9. Řezanka T, Lukavský J, Vítová M, Nedbalová L, Sigler K. Lipidomic analysis of Botryococcus (Trebouxiophyceae, Chlorophyta) - Identification of lipid classes containing very long chain fatty acids by offline two-dimensional LC-tandem MS. Phytochemistry. 2018;148:29-38 pubmed publisher
    ..In contrast to Botryococcus, C16, a substantially lower proportion of C18 polyunsaturated fatty acids and no VLCFAs were detected in Botryosphaerella. ..
  10. Spizek J, Rezanka T. Lincosamides: Chemical structure, biosynthesis, mechanism of action, resistance, and applications. Biochem Pharmacol. 2017;133:20-28 pubmed publisher
    ..Resistance to lincomycin and clindamycin may be caused by methylation of 23S ribosomal RNA, modification of the antibiotics by specific enzymes or active efflux from the bacterial cell. ..
  11. Nedbalová L, Střížek A, Sigler K, Rezanka T. Effect of salinity on the fatty acid and triacylglycerol composition of five haptophyte algae from the genera Coccolithophora, Isochrysis and Prymnesium determined by LC-MS/APCI. Phytochemistry. 2016;130:64-76 pubmed publisher
    ....
  12. Řezanka T, Pádrová K, Sigler K. Regioisomeric and enantiomeric analysis of triacylglycerols. Anal Biochem. 2017;524:3-12 pubmed publisher
    ..Details of mass spectrometry of triacylglycerols are also described, especially the identification of important triacylglycerol ions such as [M + H-RCOOH]+ in atmospheric pressure chemical ionization mass spectra. ..
  13. Rezanka T, Temina M, Tolstikov A, Dembitsky V. Natural microbial UV radiation filters--mycosporine-like amino acids. Folia Microbiol (Praha). 2004;49:339-52 pubmed
    ..This review points to the role of MAAs as a natural defense against UV radiation. ..
  14. Rezanka T, Dembitsky V. The colleflaccinosides, two chiral bianthraquinone glycosides with antitumor activity from the lichen Collema flaccidum collected in Israel and Russia. Nat Prod Res. 2006;20:969-80 pubmed
    ..Their structures were elucidated using UV, CD, IR, MS, 1D and 2D NMR spectral data, and chemical degradation. The colleflaccinosides B had significant antitumor activity in the crown gall tumor inhibition test. ..
  15. Rezanka T, Matoulková D, Kyselová L, Sigler K. Identification of plasmalogen cardiolipins from Pectinatus by liquid chromatography-high resolution electrospray ionization tandem mass spectrometry. Lipids. 2013;48:1237-51 pubmed publisher
    ..The high resolution mass spectrometry allowed the unambiguous structural assignment of Ptd2Gro, PlsPtd2Gro, and Pls2Ptd2Gro in the three species of Pectinatus, which contain predominantly odd numbered fatty acids...
  16. Rezanka T, Kolouchová I, Gharwalova L, Palyzová A, Sigler K. Identification and Characterization of Phospholipids with Very Long Chain Fatty Acids in Brewer's Yeast. Lipids. 2017;52:1007-1017 pubmed publisher
    ..Wild-type unmutated brewer's yeast strains conventionally used for the manufacture of food supplements were found to contain VLCFA. ..
  17. Rezanka T, Sigler K. Identification of very long chain unsaturated fatty acids from Ximenia oil by atmospheric pressure chemical ionization liquid chromatography-mass spectroscopy. Phytochemistry. 2007;68:925-34 pubmed
    ..The combination of these two techniques was used to identify unusual unsaturated VLCFAs up to tetracontenoic acid. All four positional isomers of tetratriacontenoic acid were also synthesized to unambiguously confirm their structure...