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PDOC00589
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1995-07-26
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* Phosphoglucomutase and phosphomannomutase phosphoserine signature *
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- Phosphoglucomutase (EC 5.4.2.2) (PGM). PGM is an enzyme responsible for
the conversion of D-glucose 1-phosphate into D-glucose 6-phosphate. PGM
participates in both the breakdown and synthesis of glucose [1].
- Phosphomannomutase (EC 5.4.2.8) (PMM). PMM is an enzyme responsible for
the conversion of D-mannose 1-phosphate into D-mannose 6-phosphate. PMM is
required for different biosynthetic pathways in bacteria. For example, in
enterobacteria such as Escherichia coli there are two different genes
coding for this enzyme: rfbK which is involved in the synthesis of the O
antigen of lipopolysaccharide and cpsG which is required for the synthesis
of the M antigen capsular polysaccharide [2]. In Pseudomonas aeruginosa PMM
(gene algC) is involved in the biosynthesis of the alginate layer [3] and
in Xanthomonas campestris (gene xanA) it is involved in the biosynthesis of
xanthan [4].
The catalytic mechanism of both PGM and PMM involves the formation of a
phosphoserine intermediate [1]. The sequence around the serine residue is
well conserved and can be used as a signature pattern.
In addition to PGM and PMM there are at least three uncharacterized proteins
that belong to this family [5]:
- Urease operon protein ureC from Helicobacter pylori.
- Escherichia coli hypothetical protein yhbF.
- A Methanococcus vannielii hypothetical protein in the 3'region of the gene
for ribosomal protein S10.
-Consensus pattern: [GA]-[LIVM]-x-[LIVM]-[ST]-[PGA]-S-H-x-P-x(4)-[GN]
[S is the phosphoserine residue]
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in SWISS-PROT: NONE.
-Note: PMM from fungi do not belong to this family.
-Last update: June 1994 / Pattern and text revised.
[ 1] Dai J.B., Liu Y., Ray W.J. Jr., Konno M.
J. Biol. Chem. 267:6322-6337(1992).
[ 2] Stevenson G., Lee S.J., Romana L.K., Reeves P.R.
Mol. Gen. Genet. 227:173-180(1991).
[ 3] Zielinski N.A., Chakrabarty A.M., Berry A.
J. Biol. Chem. 266:9754-9763(1991).
[ 4] Koeplin R., Arnold W., Hoette B., Simon R., Wang G., Puehler A.
J. Bacteriol. 174:191-199(1992).
[ 5] Bairoch A.
Unpublished observations (1993).