Abstract
1. Fully reduced and S-carboxymethylated wool samples were prepared in which either the readily reducible cystine bonds or those that could only be reduced with difficulty were specifically labelled with iodo[2-14C]acetate; these two cystine fractions correspond to the (A+B) and (C+D) cystine fractions respectively, of Middlebrook & Phillips (1942). 2. Radioactively labelled peptides were isolated from partial acid hydrolysates of these wool samples. 3. It appears that the (A+B) cystine residues probably owe their increased reactivity to being in a more polar environment. 4. The implication of these results for the problem of characterizing the disulphide bonds of wool is briefly discussed.
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- AMBLER R. P. THE AMINO ACID SEQUENCE OF PSEUDOMONAS CYTOCHROME C-551. Biochem J. 1963 Nov;89:349–378. doi: 10.1042/bj0890349. [DOI] [PMC free article] [PubMed] [Google Scholar]
- CECIL R., LOENING U. E. The reaction of the disulphide groups of insulin with sodium sulphite. Biochem J. 1960 Jul;76:146–155. doi: 10.1042/bj0760146. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Dopheide T. A. The primary structure of a protein, component 0.62, rich in glycine and aromatic residues, obtained from wool keratin. Eur J Biochem. 1973 Apr 2;34(1):120–124. doi: 10.1111/j.1432-1033.1973.tb02737.x. [DOI] [PubMed] [Google Scholar]
- Elleman T. C., Dopheide T. A. The sequence of SCMK-B2B, a high-sulfur protein from wool keratin. J Biol Chem. 1972 Jun 25;247(12):3900–3909. [PubMed] [Google Scholar]
- Elleman T. C. The amino acid sequence of protein SCMK-B2A from the high-sulphur fraction of wool keratin. Biochem J. 1972 Dec;130(3):833–845. doi: 10.1042/bj1300833. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Elleman T. C. The amino acid sequence of protein SCMK-B2C from the high-sulphur fraction of wool keratin. Biochem J. 1972 Aug;128(5):1229–1239. doi: 10.1042/bj1281229. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Haylett T., Swart L. S., Parris D. Studies on the high-sulphur proteins of reduced merino wool. Amino acid sequence of protein SCMKB-3B 3 . Biochem J. 1971 Jun;123(2):191–200. doi: 10.1042/bj1230191. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lindley H., Elleman T. C. The preparation and properties of a group of proteins from the high-sulphur fraction of wool. Biochem J. 1972 Jul;128(4):859–867. doi: 10.1042/bj1280859. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lindley H., Haylett T. Disulphide interchange reactions involving cyclocystine and their relevance to problems of alpha-keratin structure. Biochem J. 1968 Jul;108(4):701–703. doi: 10.1042/bj1080701. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lindley H., Haylett T. Occurrence of the Cys-Cys sequence in keratins. J Mol Biol. 1967 Nov 28;30(1):63–67. doi: 10.1016/0022-2836(67)90243-4. [DOI] [PubMed] [Google Scholar]
- Lindley H., Phillips H. The action of sulphites on the cystine disulphide linkages of wool: 5. The effect of some chemical modifications of the wool on the magnitude of the bisulphite-reactive fraction (A+B) and the relative magnitudes of subfractions A and B. Biochem J. 1947;41(1):34–38. [PMC free article] [PubMed] [Google Scholar]
- Middlebrook W. R., Phillips H. The action of sulphites on the cystine disulphide linkages of wool: The subdivision of the combined cystine into four fractions differing in their reactivity towards sodium bisulphite. Biochem J. 1942 Jun;36(5-6):428–437. doi: 10.1042/bj0360428. [DOI] [PMC free article] [PubMed] [Google Scholar]
- O'Donnell I. J. The complete amino acid sequence of a feather keratin from emu (Dromaius novae-hollandiae). Aust J Biol Sci. 1973 Apr;26(2):415–435. doi: 10.1071/bi9730415. [DOI] [PubMed] [Google Scholar]
- Rees M. W., Short M. N., Kassanis B. The amino acid composition, antigenicity, and other characteristics of the satellite viruses of tobacco necrosis virus. Virology. 1970 Mar;40(3):448–461. doi: 10.1016/0042-6822(70)90188-1. [DOI] [PubMed] [Google Scholar]
- Swart L. S., Haylett T. Studies on the high-sulphur proteins of reduced Merino wool. Amino acid sequence of protein SCMKB-3A3. Biochem J. 1973 Aug;133(4):641–654. doi: 10.1042/bj1330641. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Swart L. S., Haylett T. Studies on the high-sulphur proteins of reduced merino wool. Amino acid sequence of protein SCMKB-3B 4 . Biochem J. 1971 Jun;123(2):201–210. doi: 10.1042/bj1230201. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Swart L. S. Homology in the amino-acid sequences of the high-sulphur proteins from wool. Nat New Biol. 1973 May 2;243(122):27–29. [PubMed] [Google Scholar]