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• W2017609866 abstract "The cornified cell envelope (CE) is a 15-nm thick layer of insoluble protein deposited on the intracellular side of the cell membrane of terminally differentiated stratified squamous epithelia. The CE is thought to consist of a complex amalgam of proteins cross-linked by isodipeptide bonds formed by the action of transglutaminases, but little is known about how or in which order the several putative proteins are cross-linked together. In this paper, CEs purified from human foreskin epidermis were digested in two steps by proteinase K, which released as soluble peptides about 30% and then another 35% of CE protein mass, corresponding to approximately the outer third (cytoplasmic surface) and middle third, respectively. Following fractionation, 145 unique peptides containing two or more sequences cross-linked by isodipeptide bond(s) were sequenced. Based on these data, most (94% molar mass) of the outer third of CE structure consists of intra- and interchain cross-linked loricrin, admixed with SPR1 and SPR2 proteins as bridging cross-links between loricrin. Likewise, the middle third of CE structure consists largely of cross-linked loricrin and SPR proteins, but is mixed with the novel protein elafin which also forms cross-bridges between loricrin. In addition, cross-links involving loricrin and keratins 1, 2e, and 10 or filaggrin were recovered in both levels. The data establish for the first time that these several proteins are indeed cross-linked protein components of the CE structure. In addition, the data support a model for the intermediate to final stages of CE assembly: the proteins elafin, SPR1 and SPR2, and loricrin begin to be deposited on a preformed scaffold; later, elafin deposition decreases as loricrin and SPR accumulation continues to effect final assembly. The recovery of cross-links involving keratins further suggests that the subjacent cytoplasmic keratin intermediate filament-filaggrin network is anchored to the developing CE during these events. The cornified cell envelope (CE) is a 15-nm thick layer of insoluble protein deposited on the intracellular side of the cell membrane of terminally differentiated stratified squamous epithelia. The CE is thought to consist of a complex amalgam of proteins cross-linked by isodipeptide bonds formed by the action of transglutaminases, but little is known about how or in which order the several putative proteins are cross-linked together. In this paper, CEs purified from human foreskin epidermis were digested in two steps by proteinase K, which released as soluble peptides about 30% and then another 35% of CE protein mass, corresponding to approximately the outer third (cytoplasmic surface) and middle third, respectively. Following fractionation, 145 unique peptides containing two or more sequences cross-linked by isodipeptide bond(s) were sequenced. Based on these data, most (94% molar mass) of the outer third of CE structure consists of intra- and interchain cross-linked loricrin, admixed with SPR1 and SPR2 proteins as bridging cross-links between loricrin. Likewise, the middle third of CE structure consists largely of cross-linked loricrin and SPR proteins, but is mixed with the novel protein elafin which also forms cross-bridges between loricrin. In addition, cross-links involving loricrin and keratins 1, 2e, and 10 or filaggrin were recovered in both levels. The data establish for the first time that these several proteins are indeed cross-linked protein components of the CE structure. In addition, the data support a model for the intermediate to final stages of CE assembly: the proteins elafin, SPR1 and SPR2, and loricrin begin to be deposited on a preformed scaffold; later, elafin deposition decreases as loricrin and SPR accumulation continues to effect final assembly. The recovery of cross-links involving keratins further suggests that the subjacent cytoplasmic keratin intermediate filament-filaggrin network is anchored to the developing CE during these events." @default.
• W2017609866 created "2016-06-24" @default.
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• W2017609866 date "1995-07-01" @default.
• W2017609866 modified "2023-09-30" @default.
• W2017609866 title "The Proteins Elafin, Filaggrin, Keratin Intermediate Filaments, Loricrin, and Small Proline-rich Proteins 1 and 2 Are Isodipeptide Cross-linked Components of the Human Epidermal Cornified Cell Envelope" @default.
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• W2017609866 doi "https://doi.org/10.1074/jbc.270.30.17702" @default.
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