Widespread occurrence of non-phosphorylating glyceraldehyde-3-phosphate dehydrogenase among gram-positive bacteria.
The non-phosphorylating glyceraldehyde 3-phosphate dehydrogenase (GAPDHN, NADP+-specific, EC 1.2.1.9) is present in green eukaryotes and some Streptococcus strains. The present report describes the results of activity and immunoblot analyses, which were used to generate the first survey of bacterial GAPDHN distribution in a number of Bacillus, Streptococcus and Clostridium strains. Putative gapN genes were identified after PCR amplification of partial 700-bp sequences using degenerate primers constructed from highly conserved protein regions. Alignment of the amino acid sequences of these fragments with those of known sequences from other eukaryotic and prokaryotic GAPDHNs, demonstrated the presence of conserved residues involved in catalytic activity that are not conserved in aldehyde dehydrogenases, a protein family closely linked to GAPDHNs. The results confirm that the basic structural features of the members of the GAPDHN family have been conserved throughout evolution and that no identity exists with phosphorylating GAPDHs. Furthermore, phylogenetic trees generated from multiple sequence alignments suggested a close relationship between plant and bacterial GAPDHN families.
Enzymatic Engineering and Molecular Genetics Team, Faculty of Sciences Aïn-Chock, University Hassan-II, Casablanca, Morocco.
Abdelghani
A
Iddar
Federico
F
Valverde
Omar
O
Assobhei
Aurelio
A
Serrano
Abdelaziz
A
Soukri
D000595:Amino Acid Sequence; D001407:Bacillus / Q000201:enzymology; D003013:Clostridium / Q000201:enzymology; D017931:DNA Primers; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000235:genetics / Q000378:metabolism*; D006094:Gram-Positive Bacteria / Q000145:classification / Q000201:enzymology* / Q000235:genetics; D008969:Molecular Sequence Data; D010766:Phosphorylation; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013291:Streptococcus / Q000201:enzymology
D017931:DNA Primers; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases