ID   INS_CROAT               Reviewed;          51 AA.
AC   P01334;
DT   21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT   21-JUL-1986, sequence version 1.
DT   25-MAY-2022, entry version 90.
DE   RecName: Full=Insulin;
DE   Contains:
DE     RecName: Full=Insulin B chain;
DE   Contains:
DE     RecName: Full=Insulin A chain;
GN   Name=INS;
OS   Crotalus atrox (Western diamondback rattlesnake).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC   Serpentes; Colubroidea; Viperidae; Crotalinae; Crotalus.
OX   NCBI_TaxID=8730;
RN   [1]
RP   PROTEIN SEQUENCE.
RX   PubMed=939409; DOI=10.1016/0016-6480(76)90184-2;
RA   Kimmel J.R., Maher M.J., Pollock H.G., Vensel W.H.;
RT   "Isolation and characterization of reptilian insulin: partial amino acid
RT   sequence of rattlesnake (Crotalus atrox) insulin.";
RL   Gen. Comp. Endocrinol. 28:320-333(1976).
CC   -!- FUNCTION: Insulin decreases blood glucose concentration. It increases
CC       cell permeability to monosaccharides, amino acids and fatty acids. It
CC       accelerates glycolysis, the pentose phosphate cycle, and glycogen
CC       synthesis in liver.
CC   -!- SUBUNIT: Heterodimer of a B chain and an A chain linked by two
CC       disulfide bonds.
CC   -!- SUBCELLULAR LOCATION: Secreted.
CC   -!- SIMILARITY: Belongs to the insulin family. {ECO:0000305}.
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DR   PIR; A01601; INRS.
DR   AlphaFoldDB; P01334; -.
DR   SMR; P01334; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0005179; F:hormone activity; IEA:UniProtKB-KW.
DR   GO; GO:0006006; P:glucose metabolic process; IEA:UniProtKB-KW.
DR   CDD; cd04367; IlGF_insulin_like; 1.
DR   InterPro; IPR004825; Insulin.
DR   InterPro; IPR016179; Insulin-like.
DR   InterPro; IPR036438; Insulin-like_sf.
DR   InterPro; IPR022353; Insulin_CS.
DR   InterPro; IPR022352; Insulin_family.
DR   PANTHER; PTHR11454; PTHR11454; 2.
DR   Pfam; PF00049; Insulin; 2.
DR   PRINTS; PR00277; INSULIN.
DR   PRINTS; PR00276; INSULINFAMLY.
DR   SMART; SM00078; IlGF; 1.
DR   SUPFAM; SSF56994; SSF56994; 1.
DR   PROSITE; PS00262; INSULIN; 1.
PE   1: Evidence at protein level;
KW   Carbohydrate metabolism; Direct protein sequencing; Disulfide bond;
KW   Glucose metabolism; Hormone; Secreted.
FT   PEPTIDE         1..30
FT                   /note="Insulin B chain"
FT                   /evidence="ECO:0000269|PubMed:939409"
FT                   /id="PRO_0000015800"
FT   PEPTIDE         31..51
FT                   /note="Insulin A chain"
FT                   /evidence="ECO:0000269|PubMed:939409"
FT                   /id="PRO_0000015801"
FT   DISULFID        7..37
FT                   /note="Interchain (between B and A chains)"
FT   DISULFID        19..50
FT                   /note="Interchain (between B and A chains)"
FT   DISULFID        36..41
FT   NON_CONS        30..31
FT                   /evidence="ECO:0000305"
SQ   SEQUENCE   51 AA;  5794 MW;  951C975CF426A7B6 CRC64;
     APNQRLCGSH LVEALFLICG ERGFYYSPRS GIVEQCCENT CSLYQLENYC N