The cDNA sequences of cytochrome c oxidase subunit VIa from carp and rainbow trout suggest the absence of isoforms in fishes.
The cDNAs of subunit VIa of cytochrome c oxidase from rainbow trout liver and carp heart are presented, revealing 82% identity of their deduced amino acid sequences. The two cDNAs are evolutionary equally distant from the livertype (VIaL) and heart-type (VIaH) of mammalian subunit VIa. The data suggest that in ectotherm fishes no isoforms of subunit VIa occur, and that the postulated tissue-specific mechanism of thermogenesis in mammals, based on interaction of ATP with subunit VIaH (Frank, V. and Kadenbach, B. (1996) FEBS Lett. 382, 121-124), is absent.
Hüttemann
M
M
Fachbereich Chemie, Philipps-Universität, Marburg, Germany.
Exner
S
S
Arnold
S
S
Lottspeich
F
F
Kadenbach
B
B
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002347:Carps / Q000235:genetics*; D002417:Cattle; D018076:DNA, Complementary / Q000235:genetics; D003576:Electron Transport Complex IV / Q000235:genetics*; D006801:Humans; D007527:Isoenzymes / Q000235:genetics*; D008969:Molecular Sequence Data; D017686:Oncorhynchus mykiss / Q000235:genetics*; D051381:Rats; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
D018076:DNA, Complementary; D007527:Isoenzymes; D003576:Electron Transport Complex IV