ID   INS2B_CONFO             Reviewed;         128 AA.
AC   A0A0B5A7N1;
DT   15-MAR-2017, integrated into UniProtKB/Swiss-Prot.
DT   01-APR-2015, sequence version 1.
DT   25-MAY-2022, entry version 26.
DE   RecName: Full=Con-Ins F2b {ECO:0000303|PubMed:25605914};
DE   AltName: Full=Insulin 2b {ECO:0000312|EMBL:AJD85824.1};
DE   Contains:
DE     RecName: Full=Con-Ins F2b B chain {ECO:0000303|PubMed:25605914};
DE   Contains:
DE     RecName: Full=Con-Ins F2b A chain {ECO:0000303|PubMed:25605914};
DE   Flags: Precursor;
OS   Conus floridulus (Cone snail) (Lividoconus floridulus).
OC   Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Mollusca; Gastropoda;
OC   Caenogastropoda; Neogastropoda; Conoidea; Conidae; Conus; Lividoconus.
OX   NCBI_TaxID=97180;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA], AND AMIDATION AT SER-127.
RC   TISSUE=Venom gland;
RX   PubMed=25605914; DOI=10.1073/pnas.1423857112;
RA   Safavi-Hemami H., Gajewiak J., Karanth S., Robinson S.D., Ueberheide B.,
RA   Douglass A.D., Schlegel A., Imperial J.S., Watkins M., Bandyopadhyay P.K.,
RA   Yandell M., Li Q., Purcell A.W., Norton R.S., Ellgaard L., Olivera B.M.;
RT   "Specialized insulin is used for chemical warfare by fish-hunting cone
RT   snails.";
RL   Proc. Natl. Acad. Sci. U.S.A. 112:1743-1748(2015).
CC   -!- FUNCTION: This venom insulin facilitates prey capture by rapidly
CC       inducing hypoglycemic shock. Intraperitoneal injection of this peptide
CC       into zebrafish lowers blood glucose with the same potency than human
CC       insulin. In vivo, when applied to water, this peptide reduces overall
CC       locomotor activity of zebrafish larvae, observed as a significant
CC       decrease in the percentage of time spent swimming and movement
CC       frequency. {ECO:0000250|UniProtKB:A0A0B5AC95}.
CC   -!- SUBUNIT: Heterodimer of A and B chains; disulfide-linked.
CC       {ECO:0000250|UniProtKB:A0A0B5AC95}.
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000250|UniProtKB:A0A0B5AC95}.
CC   -!- TISSUE SPECIFICITY: Expressed by the venom gland.
CC       {ECO:0000305|PubMed:25605914}.
CC   -!- SIMILARITY: Belongs to the insulin family.
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DR   EMBL; KP268615; AJD85824.1; -; mRNA.
DR   AlphaFoldDB; A0A0B5A7N1; -.
DR   SMR; A0A0B5A7N1; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0005179; F:hormone activity; IEA:UniProtKB-KW.
DR   GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR   GO; GO:0006006; P:glucose metabolic process; IEA:UniProtKB-KW.
DR   InterPro; IPR016179; Insulin-like.
DR   InterPro; IPR036438; Insulin-like_sf.
DR   InterPro; IPR016724; Insulin-rel_pep.
DR   InterPro; IPR022353; Insulin_CS.
DR   InterPro; IPR022352; Insulin_family.
DR   Pfam; PF00049; Insulin; 1.
DR   PIRSF; PIRSF018431; Molluscan_insulin_rel_peptide; 1.
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   Amidation; Carbohydrate metabolism; Cleavage on pair of basic residues;
KW   Disulfide bond; Gamma-carboxyglutamic acid; Glucose metabolism; Hormone;
KW   Secreted; Signal; Toxin.
FT   SIGNAL          1..24
FT                   /evidence="ECO:0000255"
FT   PEPTIDE         25..58
FT                   /note="Con-Ins F2b B chain"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5ABD9"
FT                   /id="PRO_5002111993"
FT   PROPEP          59..89
FT                   /note="C peptide"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5ABD9"
FT                   /id="PRO_0000439336"
FT   PEPTIDE         90..127
FT                   /note="Con-Ins F2b A chain"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5ABD9"
FT                   /id="PRO_0000439337"
FT   MOD_RES         115
FT                   /note="4-carboxyglutamate; partial"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   MOD_RES         127
FT                   /note="Serine amide"
FT                   /evidence="ECO:0000305|PubMed:25605914"
FT   DISULFID        29..104
FT                   /evidence="ECO:0000305"
FT   DISULFID        41..107
FT                   /note="Interchain (between B and A chains)"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   DISULFID        53..120
FT                   /note="Interchain (between B and A chains)"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   DISULFID        106..111
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
SQ   SEQUENCE   128 AA;  13796 MW;  AE1489777263DB41 CRC64;
     MTTSSYFLLV ALGLLLYVCR SSFGSEHTCE SDASPHPQGV CGSPLAEAVE AACELEESLQ
     GGTGKKRGRA SLLRKRRAFL SMLKARAKRN EASPLQRSGR GIVCECCKNH CNLEELTEYC
     PPVTEGSG