En klass fibrösa proteiner eller skleroproteiner av betydelse både som strukturproteiner och för studiet av proteinsammansättning. Denna proteintyp utgör huvudbeståndsdelen av epidermis, hår, naglar, hornvävnad och den organiska grundmassan i tandemalj. Två huvudformer har beskrivits: alfakeratin, vars peptidstomme bildar en alfahelix (högerspiral), och betakeratin, vars stomme har en sicksack- eller veckad struktur.
A class of fibrous proteins or scleroproteins that represents the principal constituent of EPIDERMIS; HAIR; NAILS; horny tissues, and the organic matrix of tooth ENAMEL. Two major conformational groups have been characterized, alpha-keratin, whose peptide backbone forms a coiled-coil alpha helical structure consisting of TYPE I KERATIN and a TYPE II KERATIN, and beta-keratin, whose backbone forms a zigzag or pleated sheet structure. alpha-Keratins have been classified into at least 20 subtypes. In addition multiple isoforms of subtypes have been found which may be due to GENE DUPLICATION.
Keratiner — Alfa-keratin — Glykosylerad keratin — Keratin-associerade proteiner
Keratin — Cytokeratin — Keratin-Associated Proteins — Keratin Associated Proteins — Keratin Associated Protein — Associated Protein, Keratin — Protein, Keratin Associated — alpha-Keratin — alpha Keratin