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INS1A_CONTU
ID   INS1A_CONTU             Reviewed;         115 AA.
AC   A0A0B5ADU4;
DT   15-MAR-2017, integrated into UniProtKB/Swiss-Prot.
DT   01-APR-2015, sequence version 1.
DT   25-MAY-2022, entry version 22.
DE   RecName: Full=Con-Ins T1A {ECO:0000303|PubMed:30747102};
DE   AltName: Full=Con-Ins T1 {ECO:0000303|PubMed:25605914};
DE   AltName: Full=Insulin 1 {ECO:0000312|EMBL:AJD85833.1};
DE   Contains:
DE     RecName: Full=Con-Ins T1A B chain {ECO:0000303|PubMed:30747102};
DE     AltName: Full=Con-Ins T1 B chain {ECO:0000303|PubMed:25605914};
DE   Contains:
DE     RecName: Full=Con-Ins T1A A chain {ECO:0000303|PubMed:30747102};
DE     AltName: Full=Con-Ins T1 A chain {ECO:0000303|PubMed:25605914};
DE   Flags: Precursor;
OS   Conus tulipa (Fish-hunting cone snail) (Tulip cone).
OC   Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Mollusca; Gastropoda;
OC   Caenogastropoda; Neogastropoda; Conoidea; Conidae; Conus; Gastridium.
OX   NCBI_TaxID=6495;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
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).
RN   [2]
RP   FUNCTION, SYNTHESIS OF 30-52 AND 95-114, AND 3D-STRUCTURE MODELING IN
RP   COMPLEX WITH HUMAN INSULIN RECEPTOR.
RX   PubMed=30747102; DOI=10.7554/elife.41574;
RA   Ahorukomeye P., Disotuar M.M., Gajewiak J., Karanth S., Watkins M.,
RA   Robinson S.D., Florez Salcedo P., Smith N.A., Smith B.J., Schlegel A.,
RA   Forbes B.E., Olivera B., Hung-Chieh Chou D., Safavi-Hemami H.;
RT   "Fish-hunting cone snail venoms are a rich source of minimized ligands of
RT   the vertebrate insulin receptor.";
RL   Elife 8:0-0(2019).
CC   -!- FUNCTION: This venom insulin, from a fish-hunting cone snail,
CC       facilitates prey capture by rapidly inducing hypoglycemic shock
CC       (PubMed:30747102). It is one of the smallest known insulin found in
CC       nature and lacks the C-terminal segment of the B chain that, in human
CC       insulin, mediates engagement of the insulin receptor and assembly of
CC       the hormone's hexameric storage form (By similarity). Despite lacking
CC       this segment, it both binds and activates human insulin receptor (long
CC       isoform (HIR-B)) with a high potency (EC(50)=12.0 nM)
CC       (PubMed:30747102). In vivo, intraperitoneal injection of this peptide
CC       into zebrafish lowers blood glucose with a lower potency than human
CC       insulin (PubMed:30747102). In addition, when applied to water, this
CC       peptide reduces overall locomotor activity of zebrafish larvae,
CC       observed as a significant decrease in the percentage of time spent
CC       swimming and movement frequency (By similarity). When tested on a mouse
CC       model of diabetes, this insulin also lowers blood glucose with a 10-
CC       fold lower potency than human insulin (PubMed:30747102).
CC       {ECO:0000250|UniProtKB:A0A0B5AC95, ECO:0000269|PubMed:30747102}.
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   -!- MISCELLANEOUS: Is possibly an allelic variant of Con-Ins T1B (AC
CC       A0A0B5AC90). {ECO:0000305|PubMed:30747102}.
CC   -!- SIMILARITY: Belongs to the insulin family.
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DR   EMBL; KP268600; AJD85833.1; -; mRNA.
DR   AlphaFoldDB; A0A0B5ADU4; -.
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; IPR022353; Insulin_CS.
DR   Pfam; PF00049; Insulin; 1.
DR   SMART; SM00078; IlGF; 1.
DR   SUPFAM; SSF56994; SSF56994; 1.
DR   PROSITE; PS00262; INSULIN; 1.
PE   3: Inferred from homology;
KW   Amidation; Carbohydrate metabolism; Cleavage on pair of basic residues;
KW   Disulfide bond; Gamma-carboxyglutamic acid; Glucose metabolism; Hormone;
KW   Hydroxylation; Secreted; Signal; Toxin.
FT   SIGNAL          1..24
FT                   /evidence="ECO:0000255"
FT   PROPEP          25..29
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT                   /id="PRO_0000439300"
FT   PEPTIDE         30..52
FT                   /note="Con-Ins T1A B chain"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT                   /id="PRO_5002098295"
FT   PROPEP          53..94
FT                   /note="C peptide"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT                   /id="PRO_0000439301"
FT   PEPTIDE         95..114
FT                   /note="Con-Ins T1A A chain"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT                   /id="PRO_0000439302"
FT   MOD_RES         34
FT                   /note="4-hydroxyproline; partial"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   MOD_RES         41
FT                   /note="4-carboxyglutamate"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   MOD_RES         98
FT                   /note="4-carboxyglutamate"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   MOD_RES         104
FT                   /note="4-hydroxyproline; partial"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   MOD_RES         109
FT                   /note="4-carboxyglutamate; partial"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   MOD_RES         114
FT                   /note="Cysteine amide"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   DISULFID        38..101
FT                   /note="Interchain (between B and A chains)"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   DISULFID        50..114
FT                   /note="Interchain (between B and A chains)"
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
FT   DISULFID        100..105
FT                   /evidence="ECO:0000250|UniProtKB:A0A0B5AC95"
SQ   SEQUENCE   115 AA;  13161 MW;  F4E9A328A68FA8D9 CRC64;
     MTTSFYFLLM ALGLLLYVCQ SSFGNQHTRN SDTPKYRCGS EIPNSYIDLC FRKRNDAGKK
     RGRASPLWQR GGSLSMLKAR AKRNEAFHLQ RAHRGVVEHC CHRPCSNAEF KKFCG
 
 
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