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Glyceraldehyde-3-phosphate ferredoxin oxidoreductase (GAPOR) and nonphosphorylating glyceraldehyde-3-phosphate dehydrogenase (GAPN), key enzymes of the respective modified Embden-Meyerhof pathways in the hyperthermophilic crenarchaeota Pyrobaculum aerophilum and Aeropyrum pernix.

Abstract
The growth of Pyrobaculum aerophilum on yeast extract and nitrate was stimulated by the addition of maltose. Extracts of maltose/yeast extract/nitrate-grown cells contained all enzyme activities of a modified Embden-Meyerhof (EM) pathway, including ATP-dependent glucokinase, phosphoglucose isomerase, ATP-dependent 6-phosphofructokinase, fructose-1,6-phosphate aldolase, triose-phosphate isomerase, GAPOR, phosphoglycerate mutase, enolase and pyruvate kinase. The activity of GAPOR was stimulated about fourfold by maltose, indicating a role in sugar degradation. GAPOR was purified 200-fold to homogeneity and characterized as a 67 kDa monomeric, extremely thermostable protein. The enzyme showed high specificity for glyceraldehyde-3-phosphate and did not use glyceraldehyde, acetaldehyde or formaldehyde as substrates. By matrix-assisted laser desorption/ionization-time of flight analysis of the purified enzyme, ORF PA1029 was identified as a coding gene, gapor, in the sequenced genome of Pyrobaculum aerophilum. The data indicate that the (micro)aerophilic Pyrobaculum aerophilum contains a functional GAPOR as part of a modified EM pathway. Cells of the strictly aerobic crenarchaeon Aeropyrum pernix also contain enzyme activities of a modified EM pathway similar to that of Pyrobaculum aerophilum, except that a GAPN activity replaces GAPOR activity.
AuthorsMatthias Reher, Susanne Gebhard, Peter Schönheit
JournalFEMS microbiology letters (FEMS Microbiol Lett) Vol. 273 Issue 2 Pg. 196-205 (Aug 2007) ISSN: 0378-1097 [Print] England
PMID17559573 (Publication Type: Journal Article)
Chemical References
  • Glyceraldehyde-3-Phosphate Dehydrogenases
  • glyceraldehyde-3-phosphate ferredoxin oxidoreductase
Topics
  • Aeropyrum (classification, enzymology)
  • Carbohydrate Metabolism
  • Glyceraldehyde-3-Phosphate Dehydrogenases (isolation & purification, metabolism)
  • Glycolysis (physiology)
  • Phylogeny
  • Pyrobaculum (classification, enzymology)
  • Substrate Specificity

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