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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Participation of membrane-associated proteins in the formation of the cross-linked envelope of the keratinocyte.

Cultured keratinocytes, like those in natural squamous epithelia, form submembranous protein envelopes cross-linked by cellular transglutaminase. During the cross-linking, the cytosolic protein involucrin becomes incorporated into the envelope and can no longer be extracted by detergents. We show here that when transglutaminase is activated in cultured keratinocytes, at least six other proteins also become nonextractable. In contrast to involucrin, these proteins are associated with membranes. Two of the proteins (210 and 195 kd) are differentiated products specific to the keratinocyte; like involucrin, they are absent from small keratinocytes and fibroblasts, but appear in larger keratinocytes during the course of their terminal differentiation. The other proteins that become nonextractable cannot be destined exclusively for envelope formation since they are also present in fibroblasts. Transglutaminase is used by the mature (large) keratinocyte to make a detergent-resistant envelope from what appears to be a mixture of differentiation-specific and nonspecific proteins, both membrane-bound and cytosolic.[1]


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