PMID: 6170342Jun 29, 1981Paper

Studies on the synthesis and degradation of a high molecular weight, histidine-rich phosphoprotein from mammalian epidermis

Biochimica Et Biophysica Acta
I R Scott, C R Harding

Abstract

The synthesis and subsequent fate of the histidine-rich proteins, which form a major component of keratohyalin granules in mammalian epidermis, have been studied in the guinea-pig and new-born rat. In both species the protein first synthesised is of very high molecular weight, approximately 340 000. It is short-lived and breaks down to lower molecular weight proteins 1-2 days after its synthesis. These smaller proteins differ in the two species. In the guinea-pig, the high molecular weight protein breaks down to proteins of molecular weight 250 000 and 200 000, which are themselves unstable and break down to low molecular weight species, probably amino acids. The initial breakdown of the high molecular weight protein coincides with the dispersion of the keratohyalin granules and the transition of the granular cell into the stratum corneum. This high molecular weight histidine-rich protein has been purified to homogeneity, despite its instability to several treatments during purification. The protein is highly phosphorylated, containing 6 mol% of phosphoserine, but is otherwise very basic. The possibility that dephosphorylation of the protein produces highly basic matrix proteins in the stratum corneum is discussed.

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Citations

Jan 1, 1987·Archives of Dermatological Research·J Mansbridge, M Knapp
Mar 1, 1987·The Histochemical Journal·T P SmithC J Bailey
Jul 1, 1996·Archives of Dermatological Research·T SeguchiT Tezuka
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