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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- Unpublished observations (1993).
-