ID   KRFT_ANAPL              Reviewed;          95 AA.
AC   P08335;
DT   01-AUG-1988, integrated into UniProtKB/Swiss-Prot.
DT   01-AUG-1988, sequence version 1.
DT   25-MAY-2022, entry version 51.
DE   RecName: Full=Feather keratin B-4;
DE            Short=F-ker;
OS   Anas platyrhynchos (Mallard) (Anas boschas).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Archelosauria; Archosauria; Dinosauria; Saurischia; Theropoda;
OC   Coelurosauria; Aves; Neognathae; Galloanserae; Anseriformes; Anatidae;
OC   Anatinae; Anas.
OX   NCBI_TaxID=8839;
RN   [1]
RP   PROTEIN SEQUENCE, AND ACETYLATION AT SER-1.
RC   TISSUE=Feather;
RA   Arai K.M., Takahashi R., Yokote Y., Akahane K.;
RT   "The primary structure of feather keratins from duck (Anas platyrhynchos)
RT   and pigeon (Columba livia).";
RL   Biochim. Biophys. Acta 873:6-12(1986).
CC   -!- SUBUNIT: The avian keratins (F-ker, S-ker, C-ker and B-ker) are a
CC       complex mixture of very similar polypeptides.
CC   -!- SIMILARITY: Belongs to the avian keratin family. {ECO:0000305}.
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DR   PIR; A24506; KRDKF4.
DR   AlphaFoldDB; P08335; -.
DR   GO; GO:0005882; C:intermediate filament; IEA:UniProtKB-KW.
DR   GO; GO:0005200; F:structural constituent of cytoskeleton; IEA:InterPro.
DR   InterPro; IPR003461; Keratin.
DR   PANTHER; PTHR31203; PTHR31203; 1.
DR   Pfam; PF02422; Keratin; 1.
PE   1: Evidence at protein level;
KW   Acetylation; Direct protein sequencing; Keratin.
FT   CHAIN           1..95
FT                   /note="Feather keratin B-4"
FT                   /id="PRO_0000096995"
FT   MOD_RES         1
FT                   /note="N-acetylserine"
FT                   /evidence="ECO:0000269|Ref.1"
SQ   SEQUENCE   95 AA;  9662 MW;  B90FC4CA43805817 CRC64;
     SCYDLCRPCG PTPLANSCNE PCVRQCQDSR VVIQPSPVVV TLPGPILSSF PQNTAVGSTS
     AAVGSILSEE GVPISSGGFG LSGFGGRYSG RCLPC