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- *************************
- * mutT domain signature *
- *************************
-
- The bacterial mutT protein is involved in the GO system [1] responsible for
- removing an oxidatively damaged form of guanine (8-hydroxyguanine or
- 7,8-dihydro-8-oxoguanine) from DNA and the nucleotide pool. 8-oxo-dGTP is
- inserted opposite to dA and dC residues of template DNA with almost equal
- efficiency thus leading to A.T to G.C transversions. MutT specifically
- degrades 8-oxo-dGTP to the monophosphate with the concomitant release of
- pyrophosphate. MutT is a small protein of about 12 to 15 Kd.
-
- It has been shown [2] that a region of about 40 amino acid residues, which is
- found in the N-terminal part of mutT, can also be found in a variety of other
- prokaryotic, viral, and eukaryotic proteins. These proteins are:
-
- - A mutT homolog from plasmid pSAM2 of Streptomyces ambofaciens.
- - Bartonella bacilliformis invasion protein A (gene invA).
- - Escherichia coli hypothetical protein yebD.
- - Escherichia coli hypothetical protein yjaD.
- - Protein D250 from African swine fever viruses.
- - Proteins D9 and D10 from a variety of poxviruses.
- - Human 7,8-dihydro-8-oxoguanine triphosphatase [3].
- - A protein encoded on the antisense RNA of the basic fibroblast growth
- factor gene in higher vertebrates.
-
- It is proposed [2] that the conserved domain could be involved in the active
- center of a family of pyrophosphate-releasing NTPases. As a signature pattern
- we selected the core region of the domain; it contains four conserved
- glutamate residues.
-
- -Consensus pattern: G-x(5)-E-x(4)-[STAGC]-[LIVMA]-x-R-E-[LIVMF]-x-E-E
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Expert(s) to contact by email: Koonin E.V.
- koonin@ncbi.nlm.nih.gov
-
- -Last update: June 1994 / Text revised.
-
- [ 1] Michaels M.L., Miller J.H.
- J. Bacteriol. 174:6321-6325(1992).
- [ 2] Koonin E.V.
- Nucleic Acids Res. 21:4847-4847(1993).
- [ 3] Sakumi K., Furuichi M., Tsuzuki T., Kakuma T., Kawabata S., Maki H.,
- Sekiguchi M.
- J. Biol. Chem. 268:23524-23530(1993).
-