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- **********************************************************************
- * Nickel-dependent hydrogenases b-type cytochrome subunit signatures *
- **********************************************************************
-
- Bacterial membrane-bound nickel-dependent hydrogenases [1,2,3] seem to be
- associated with a b-type cytochrome involved in electron transfer from
- hydrogen to oxygen. This cytochrome is a protein of about 28 Kd that seems to
- have four transmembrane regions. The gene coding for this cytochrome is
- adjacent to that coding for the large subunit of the hydrogenase. It has been
- assigned a variety of names in different species: hupC, hyaC, hydC or hoxZ.
-
- We developed two signature patterns for this protein. The first corresponds to
- the first potential transmembrane region. The second signature includes the C-
- terminal part of a hydrophilic loop between the third and the fourth
- transmembrane region as well as the first half of the fourth transmembrane
- region. Both signatures contain conserved histidines that could be involved in
- binding the heme iron group.
-
- -Consensus pattern: R-[LIVMFYW]-x-H-W-[LIVM]-x(2)-[LIVMF]-[STAC]-[LIVM]-x(2)-
- L-x-[LIVM]-T-G
- [H could be a heme ligand]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [RH]-[STA]-[LIVMFYW]-H-[RH]-[LIVM]-x(2)-W-x-[LIVMF]-x(2)-
- F-x(3)-H
- [The two H's could be heme ligands]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: October 1993 / First entry.
-
- [ 1] Cauvin B., Colbeau A., Vignais P.M.
- Mol. Microbiol. 5:2519-2527(1991).
- [ 2] Dross F., Geisler V., Lenger R., Theis F., Krafft T., Fahrenholz F.,
- Kojro E., Duchene A., Tripier D., Juvenal K., Kroeger A.
- Eur. J. Biochem. 206:93-102(1992).
- [ 3] Hidalgo E., Palacios J.M., Murillo J., Ruiz-Argueso T.
- J. Bacteriol. 174:4130-4139(1992).
-