The action of sulphites on the cystine disulphide linkages of wool: 4. Methylation of the thiol groups of bisulphited wools.
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چکیده
منابع مشابه
50 . The Action of Sulphites on the Cystine Disulphide Linkages of Wool
(R1 and R2, polypeptide chains.) The optimum pH for the reaction is 5. Increasing the temperature, time of reaction or concentration ofNaHSO3 does not cause more than about one-third of the disulphide-S to react [Elsworth & Phillips, 1941]. The reaction is slowly reversed when the bisulphited wool is rinsed with cold water, but it is possible to free the treated wool from uncombined NaHSO3 and ...
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During some studies on the reactivity of the cystine linkages in wool, it was necessary to find methods for blocking the various polar side chains with minimum degradation of the fibre as a whole, and without introducing any coloration due to the reagent used. Various workers have found that the amino groups of proteins react readily with i8ocyanates in aqueous solution at pH 8 and 00 (Hopkins ...
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Only 50% ofthe disulphide-S ofwool will react with NaHSO3 to give thiol and S-cysteinesulphonate groups (Elsworth & Phillips, 1941; Middlebrook & Phillips, 1942). We have now shown that the disulphide-S ofwool can be subdivided into two halves differing in their reaction with alkalis; one-half tends to decompose according to reaction (1), whilst the other half tends to decompose according to re...
متن کاملSelective purification of the thiol peptides of myosin.
1. A method for selective purification of thiol peptides is described. Thiol groups in a protein are treated with radioactive cystine by disulphide-thiol interchange. The labelled cystine peptides in a digest can then be fractionated for peptide ;maps'. Performic acid oxidation of paper strips containing the radioactive peptides followed by further ionophoresis yields the purified cysteic acid ...
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عنوان ژورنال:
- The Biochemical journal
دوره 38 1 شماره
صفحات -
تاریخ انتشار 1944