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| {{STRUCTURE_1txg| PDB=1txg | SCENE= }} | | {{STRUCTURE_1txg| PDB=1txg | SCENE= }} |
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| '''Structure of glycerol-3-phosphate dehydrogenase from Archaeoglobus fulgidus'''
| | ===Structure of glycerol-3-phosphate dehydrogenase from Archaeoglobus fulgidus=== |
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| ==Overview==
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| NAD(+)-dependent glycerol-3-phosphate dehydrogenase (G3PDH) is generally absent in archaea, because archaea, unlike eukaryotes and eubacteria, utilize glycerol-1-phosphate instead of glycerol-3-phosphate for the biosynthesis of membrane lipids. Surprisingly, the genome of the hyperthermophilic archaeon Archaeoglobus fulgidus comprises a G3PDH ortholog, gpsA, most likely due to horizontal gene transfer from a eubacterial organism. Biochemical characterization proved G3PDH-like activity of the recombinant gpsA gene product. However, unlike other G3PDHs, the up to 85 degrees C thermostable A. fulgidus G3PDH exerted a 15-fold preference for NADPH over NADH. The A. fulgidus G3PDH bears the hallmarks of adaptation to halotolerance and thermophilicity, because its 1.7-A crystal structure showed a high surface density for negative charges and 10 additional intramolecular salt bridges compared to a mesophilic G3PDH structure. Whereas all amino acid residues required for dihydroxyacetone phosphate binding and reductive catalysis are highly conserved, the binding site for the adenine moiety of the NAD(P) cosubstrate shows a structural variation that reflects the observed NADPH preference, for example, by a putative salt bridge between R49 and the 2'-phosphate.
| | The line below this paragraph, {{ABSTRACT_PUBMED_15557260}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 15557260 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_15557260}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Thauer, R K.]] | | [[Category: Thauer, R K.]] |
| [[Category: Oxidoreductase]] | | [[Category: Oxidoreductase]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:29:14 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 10:18:49 2008'' |