UniProtKB - A0A0B5AC86 (INS3B_CONGE)
Con-Ins G3b
Functioni
This venom insulin, from a fish-hunting cone snail, facilitates prey capture by rapidly inducing hypoglycemic shock. It is one of the smallest known insulin found in nature and lacks the C-terminal segment of the B chain that, in human insulin, mediates engagement of the insulin receptor and assembly of the hormone's hexameric storage form. Despite lacking this segment, it both binds and activates human insulin receptor (long isoform (HIR-B)) with only a 10-fold lower potency. In vivo, intraperitoneal injection of this peptide into zebrafish lowers blood glucose with the same potency than human insulin. In addition, when applied to water, this peptide reduces overall locomotor activity of zebrafish larvae, observed as a significant decrease in the percentage of time spent swimming and movement frequency.
By similarityMiscellaneous
GO - Molecular functioni
- hormone activity Source: UniProtKB-KW
- toxin activity Source: UniProtKB-KW
GO - Biological processi
- glucose metabolic process Source: UniProtKB-KW
Keywordsi
Molecular function | Hormone, Toxin |
Biological process | Carbohydrate metabolism, Glucose metabolism |
Names & Taxonomyi
Protein namesi | Recommended name: Con-Ins G3b1 PublicationAlternative name(s): Insulin 3bImported Cleaved into the following 2 chains: Con-Ins G3b B chain1 Publication Con-Ins G3b A chain1 Publication |
Organismi | Conus geographus (Geography cone) (Nubecula geographus) |
Taxonomic identifieri | 6491 [NCBI] |
Taxonomic lineagei | Eukaryota › Metazoa › Spiralia › Lophotrochozoa › Mollusca › Gastropoda › Caenogastropoda › Neogastropoda › Conoidea › Conidae › Conus › Gastridium |
Subcellular locationi
Extracellular region or secreted
- Secreted By similarity
Extracellular region or secreted
- extracellular region Source: UniProtKB-SubCell
Keywords - Cellular componenti
SecretedPTM / Processingi
Molecule processing
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Signal peptidei | 1 – 21 | Sequence analysisAdd BLAST | 21 | |
PropeptideiPRO_0000439313 | 22 – 29 | By similarity | 8 | |
PeptideiPRO_5002098282 | 30 – 51 | Con-Ins G3b B chainBy similarityAdd BLAST | 22 | |
PropeptideiPRO_0000439314 | 52 – 92 | C peptideBy similarityAdd BLAST | 41 | |
PeptideiPRO_0000439315 | 93 – 113 | Con-Ins G3b A chainBy similarityAdd BLAST | 21 |
Amino acid modifications
Feature key | Position(s) | DescriptionActions | Graphical view | Length |
---|---|---|---|---|
Modified residuei | 34 | 4-hydroxyproline; partialBy similarity | 1 | |
Disulfide bondi | 38 ↔ 99 | Interchain (between B and A chains)By similarity | ||
Modified residuei | 41 | 4-carboxyglutamateBy similarity | 1 | |
Disulfide bondi | 50 ↔ 112 | Interchain (between B and A chains)By similarity | ||
Modified residuei | 51 | Histidine amideBy similarity | 1 | |
Modified residuei | 96 | 4-carboxyglutamateBy similarity | 1 | |
Disulfide bondi | 98 ↔ 103 | By similarity | ||
Modified residuei | 102 | 4-hydroxyproline; partialBy similarity | 1 |
Post-translational modificationi
Keywords - PTMi
Amidation, Cleavage on pair of basic residues, Disulfide bond, Gamma-carboxyglutamic acid, HydroxylationExpressioni
Tissue specificityi
Interactioni
Subunit structurei
Heterodimer of A and B chains; disulfide-linked.
By similarityGO - Molecular functioni
- hormone activity Source: UniProtKB-KW
Structurei
3D structure databases
AlphaFoldDBi | A0A0B5AC86 |
ModBasei | Search... |
SWISS-MODEL-Workspacei | Submit a new modelling project... |
Family & Domainsi
Sequence similaritiesi
Keywords - Domaini
SignalFamily and domain databases
InterProi | View protein in InterPro IPR016179, Insulin-like IPR036438, Insulin-like_sf IPR022353, Insulin_CS IPR022352, Insulin_family |
Pfami | View protein in Pfam PF00049, Insulin, 1 hit |
PRINTSi | PR00276, INSULINFAMLY |
SMARTi | View protein in SMART SM00078, IlGF, 1 hit |
SUPFAMi | SSF56994, SSF56994, 1 hit |
PROSITEi | View protein in PROSITE PS00262, INSULIN, 1 hit |
i Sequence
Sequence statusi: Complete.
: The displayed sequence is further processed into a mature form. Sequence processingi
10 20 30 40 50
MTTSFYFLLV ALGLLLYVCQ SSFGNQHTRN SDTPKHRCGS ELADQYVQLC
60 70 80 90 100
HGKRNDAGKK RGRASPLWQR QGFLSMLKAK RNEAFFLQRD GRGIVEVCCD
110
NPCTVATLMT FCH
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | KP268618 mRNA Translation: AJD85822.1 |
Similar proteinsi
Cross-referencesi
Sequence databases
Select the link destinations: EMBLi GenBanki DDBJi Links Updated | KP268618 mRNA Translation: AJD85822.1 |
3D structure databases
AlphaFoldDBi | A0A0B5AC86 |
ModBasei | Search... |
SWISS-MODEL-Workspacei | Submit a new modelling project... |
Family and domain databases
InterProi | View protein in InterPro IPR016179, Insulin-like IPR036438, Insulin-like_sf IPR022353, Insulin_CS IPR022352, Insulin_family |
Pfami | View protein in Pfam PF00049, Insulin, 1 hit |
PRINTSi | PR00276, INSULINFAMLY |
SMARTi | View protein in SMART SM00078, IlGF, 1 hit |
SUPFAMi | SSF56994, SSF56994, 1 hit |
PROSITEi | View protein in PROSITE PS00262, INSULIN, 1 hit |
MobiDBi | Search... |
Entry informationi
Entry namei | INS3B_CONGE | |
Accessioni | A0A0B5AC86Primary (citable) accession number: A0A0B5AC86 | |
Entry historyi | Integrated into UniProtKB/Swiss-Prot: | March 15, 2017 |
Last sequence update: | April 1, 2015 | |
Last modified: | May 25, 2022 | |
This is version 23 of the entry and version 1 of the sequence. See complete history. | ||
Entry statusi | Reviewed (UniProtKB/Swiss-Prot) | |
Annotation program | Animal Toxin Annotation Program |