ID   CYGN_CYGAT              Reviewed;          39 AA.
AC   P02785;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1994, sequence version 3.
DT   25-MAY-2022, entry version 53.
DE   RecName: Full=Cygnin;
OS   Cygnus atratus (Black swan) (Anas atrata).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Archelosauria; Archosauria; Dinosauria; Saurischia; Theropoda;
OC   Coelurosauria; Aves; Neognathae; Galloanserae; Anseriformes; Anatidae;
OC   Anserinae; Cygnus.
OX   NCBI_TaxID=8868;
RN   [1]
RP   PROTEIN SEQUENCE, AND PYROGLUTAMATE FORMATION AT GLN-1.
RC   TISSUE=Egg white;
RX   PubMed=6654595;
RA   Simpson R.J., Morgan F.J.;
RT   "Isolation and complete amino acid sequence of a basic low molecular weight
RT   protein from black swan egg white.";
RL   Int. J. Pept. Protein Res. 22:476-481(1983).
CC   -!- SIMILARITY: Belongs to the transferrin family. {ECO:0000305}.
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DR   PIR; A03258; IZWS.
DR   AlphaFoldDB; P02785; -.
DR   SMR; P02785; -.
DR   InterPro; IPR012573; Meleagrin/Cygnin.
DR   Pfam; PF08189; Meleagrin; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Disulfide bond; Pyrrolidone carboxylic acid.
FT   PEPTIDE         1..39
FT                   /note="Cygnin"
FT                   /id="PRO_0000045042"
FT   MOD_RES         1
FT                   /note="Pyrrolidone carboxylic acid"
FT                   /evidence="ECO:0000269|PubMed:6654595"
FT   DISULFID        6..33
FT                   /note="Or C-6 with C-32"
FT                   /evidence="ECO:0000250"
FT   DISULFID        12..28
FT                   /evidence="ECO:0000250"
FT   DISULFID        16..32
FT                   /note="Or C-16 with C-33"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   39 AA;  4452 MW;  8D5DE270495FB4A4 CRC64;
     QVRKYCPKVG YCSSKCSKAD VWSLSSDCKF YCCLPPGWK