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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Differential processing of human and rat E1 alpha precursors of the branched-chain alpha-keto acid dehydrogenase complex caused by an N-terminal proline in the rat sequence.

The N-terminal sequences of the E1 alpha, E1 beta and E2 subunits of the human branched-chain alpha-keto acid dehydrogenase complex have been determined by microsequencing. The N-terminal of human E1 beta and E2 subunits (Val and Gly, respectively) are identical to those of the corresponding rat and bovine subunits. However, the N-terminus of the human E1 alpha subunit (Ser) is identical to bovine, but differs from the rat E1 alpha (Phe) subunit. Comparison of the N-terminal sequences of human and rat E1 alpha subunits shows that the serine residue at the +1 position in the human sequence is replaced by a proline residue in the rat sequence. The presence of the proline residue apparently causes a 5'-shift by one residue in the cleavage site by the mitochondrial processing peptidase in the rat sequence, when compared to the human sequence. The results provide evidence that the mitochondrial processing peptidase cannot cleave an X-Pro bond, similar to trypsin, chymotrypsin and microsomal signal peptidases.[1]


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