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- * Prokaryotic-type carbonic anhydrases signatures *
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-
- Carbonic anhydrases (EC 4.2.1.1) (CA) are zinc metalloenzymes which catalyze
- the reversible hydration of carbon dioxide.
-
- In Escherichia coli, CA (gene cynT) is involved in recycling carbon dioxide
- formed in the bicarbonate-dependent decomposition of cyanate by cyanase (gene
- cynS). By this action, it prevents the depletion of cellular bicarbonate [1].
- In photosynthetic bacteria and plant chloroplast, CA is essential to inorganic
- carbon fixation [2].
-
- Prokaryotic and plant chloroplast CA are structurally and evolutionary related
- and form a family distinct from the one which groups the many different forms
- of eukaryotic CA's.
-
- The hypothetical Escherichia coli protein yadF also belongs to this family.
-
- We developed two signature patterns for this family of enzymes. Both patterns
- contain conserved residues that could be involved in binding zinc (cysteine
- and histidine).
-
- -Consensus pattern: C-S-D-S-R-[LIVM]-x-[AP]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [EQ]-Y-A-[LIVM]-x(2)-[LIVM]-x(4)-[LIVM](3)-x-G-H-x(2)-C-G
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: June 1994 / Patterns and text revised.
-
- [ 1] Guilloton M.B., Korte J.J., Lamblin A.F., Fuchs J.A., Anderson P.M.
- J. Biol. Chem. 267:3731-3734(1992).
- [ 2] Fukuzawa H., Suzuki E., Komukai Y., Miyachi S.
- Proc. Natl. Acad. Sci. U.S.A. 89:4437-4441(1992).
-