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- W1912804952 abstract "We describe the N epsilon-acetimidylation of horse heart cytochrome c with retention of biological activity, the cleavage of the modified protein by CNBr, the separation of the fragments, and their further side-chain protection. We describe the manipulation of the amino acid sequences of the fragments by stepwise semisynthetic methods. We have prepared fragments corresponding to residues 66-78 and 66-79 of the protein, as well as the [Asp66] analogue of fragment 66-79. We have prepared the natural sequence and the [o-fluoro-Phe82] analogue of the fragment corresponding to residues 81-104 of the protein, and the [N epsilon-trifluoroacetyl-Lys79], the [N epsilon-dinitrophenyl-Lys79] and the [S-acetamidomethyl-Cys79] analogues of fragment 79-104, and the [N epsilon-Cbz-Lys81] analogue of fragment 80-104. We have coupled back the fragments of natural sequence to form a semisynthetic fragment corresponding to residues 66-104 of the protein. Modified fragments were also coupled to give analogues of the 66-104-residue sequence. In every case the homoserine residue representing methionine-80 was removed from the C-terminus of the 66-80-residue fragment and replaced by methionine on the N-terminus of the 81-104 residue fragment during the preparation of the fragments for coupling. The semisynthetic fragments are ready for specific deprotection and further coupling. We have coupled one such fragment to the (1-65)-peptide to produce semisynthetic [Hse65]cytochrome c. The product has satisfactory characteristics on chemical analysis, and on assay of its biological activity." @default.
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- W1912804952 date "1979-04-01" @default.
- W1912804952 modified "2023-10-18" @default.
- W1912804952 title "The semisynthesis of fragments corresponding to residues 66-104 of horse heart cytochrome c" @default.
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- W1912804952 doi "https://doi.org/10.1042/bj1790169" @default.
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