home *** CD-ROM | disk | FTP | other *** search
- *************************************************************
- * Respiratory-chain NADH dehydrogenase subunit 1 signatures *
- *************************************************************
-
- Respiratory-chain NADH dehydrogenase (EC 1.6.5.3) [1,2] (also known as complex
- I or NADH-ubiquinone oxidoreductase) is an oligomeric enzymatic complex
- located in the inner mitochondrial membrane which also seems to exist in
- the chloroplast and in cyanobacteria (as a NADH-plastoquinone oxidoreductase).
- Among the 25 to 30 polypeptide subunits of this bioenergetic enzyme complex
- there are fifteen which are located in the membrane part, seven of which are
- encoded by the mitochondrial and chloroplast genomes of most species. The most
- conserved of these organelle-encoded subunits is known as subunit 1 (gene ND1
- in mitochondrion, and NDH1 in chloroplast) and seems to contain the ubiquinone
- binding site.
-
- The ND1 subunit is highly similar to subunit 4 of Escherichia coli formate
- hydrogenlyase (gene hycD). Paracoccus denitrificans NQO8 and Escherichia coli
- nuoH NADH-ubiquinone oxidoreductase subunits also belong to this family [3].
-
- We have developed two signature patterns based on conserved regions of this
- subunit.
-
- -Consensus pattern: G-[LIVMFYKRS]-[LIVMAGP]-Q-x-[LIVMFY]-x-D-[AGIM]-[LIVMFT]-
- K-[LVMYT]-[LIVMFYG]-x-[KR]-[EQG]
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for watermelon and Leishmania ND1.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: P-F-D-[LIVMFYQ]-[STAGPVM]-E-[GAC]-E-x-[EQ]-[LIVMS]-x(2)-G
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for Chlamydomonas reinhardtii and Pisaster ochraceus ND1, and tobacco NDH1.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: June 1994 / Patterns and text revised.
-
- [ 1] Ragan C.I.
- Curr. Top. Bioenerg. 15:1-36(1987).
- [ 2] Weiss H., Friedrich T., Hofhaus G., Preis D.
- Eur. J. Biochem. 197:563-576(1991).
- [ 3] Weidner U., Geier S., Ptock A., Friedrich T., Leif H., Weiss H.
- J. Mol. Biol. 233:109-122(1993).
-