The plant mitochondrial F1-ATPase The identity of the δ' (20 kDa) subunit

AbstractThe N-terminal amino acid sequence of the 20 kDa (δ') subunit of the turnip (Brassica napus L) mitochondrial F1-ATPase has been determined. Comparison of the sequence obtained with those of the ɛ subunits of chloroplast CF1, E. coli F1 and the δ subunit of bovine F1 shows that the turnip δ subunit is another member of this family of homologous proteins. The δ subunit of sweet potato F1-ATPase [(1989) J. Biol. Chem. 264, 3183-3186] is very similar to the turnip sequence and thus can also be considered to belong to this family