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Protein

Cytotoxic linear peptide IsCT

Gene
N/A
Organism
Opisthacanthus madagascariensis (Scorpion)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

Cytotoxic linear peptide IsCT: shows weak hemolytic activity and antibacterial activity against both Gram-positive and Gram-negative bacteria probably by forming pores in the cell membrane. IsCT adopts an amphipathic alpha-helical structure.
Cytotoxic linear peptide IsCTf: shows neither hemolytic, nor antibacterial activities, probably because it cannot adopt amphipathic alpha-helical structure.

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Sitei29 – 291Important for antibacterial activity, and hemolysis activity

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Antibiotic, Antimicrobial, Toxin

Keywords - Biological processi

Cytolysis, Ion transport, Transport

Names & Taxonomyi

Protein namesi
Recommended name:
Cytotoxic linear peptide IsCT
Alternative name(s):
Non-disulfide-bridged peptide 4.11 Publication
Short name:
NDBP-4.11 Publication
Non-disulfide-bridged peptide 5.21 Publication
Short name:
NDBP-5.21 Publication
Cleaved into the following chain:
OrganismiOpisthacanthus madagascariensis (Scorpion)
Taxonomic identifieri167108 [NCBI]
Taxonomic lineageiEukaryotaMetazoaEcdysozoaArthropodaChelicerataArachnidaScorpionesIuridaScorpionoideaHemiscorpiidaeOpisthacanthus

Subcellular locationi

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Membrane, Secreted, Target cell membrane, Target membrane

Pathology & Biotechi

Mutagenesis

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Mutagenesisi29 – 291W → A: Drastic reduction in antibacterial activity against both Gram-positive and Gram-negative bacteria, and complete loss of hemolysis activity. 1 Publication
Mutagenesisi29 – 291W → L: Drastic reduction in antibacterial activity against both Gram-positive and Gram-negative bacteria, and big loss of hemolysis activity. Similar or 2-fold increase in antibacterial activity against both Gram-positive and Gram-negative bacteria, and big loss of hemolysis activity; when associated with K-34. 1 Publication
Mutagenesisi30 – 301E → K: Similar or 2-fold increase in antibacterial activity against both Gram-positive and Gram-negative bacteria, and little loss of hemolysis activity. Similar or 2-fold increase in antibacterial activity against both Gram-positive and Gram-negative bacteria, and complete loss of hemolysis activity; when associated with P-31 and K-34. 1 Publication
Mutagenesisi31 – 311G → P: Similar or 2-fold increase in antibacterial activity against both Gram-positive and Gram-negative bacteria, and complete loss of hemolysis activity; when associated with K-30 and K-34. 1 Publication
Mutagenesisi34 – 341S → K: Similar or 2-fold increase in antibacterial activity against both Gram-positive and Gram-negative bacteria, and big loss of hemolysis activity; when associated with L-29. Similar or 2-fold increase in antibacterial activity against both Gram-positive and Gram-negative bacteria, and complete loss of hemolysis; when associated with K-30 and P-31. 1 Publication

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Signal peptidei1 – 23232 PublicationsAdd
BLAST
Peptidei24 – 3613Cytotoxic linear peptide IsCTPRO_0000035356Add
BLAST
Peptidei24 – 3411Cytotoxic linear peptide IsCTfPRO_0000035357Add
BLAST
Propeptidei40 – 6829PRO_0000035358Add
BLAST

Amino acid modifications

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Modified residuei36 – 361Phenylalanine amide

Post-translational modificationi

IsCTf is an enzymatic proteolytic cleavage product of IsCT by the proteases present in the venom.

Keywords - PTMi

Amidation, Cleavage on pair of basic residues

Expressioni

Tissue specificityi

Expressed by the venom gland.

Structurei

Secondary structure

1
68
Legend: HelixTurnBeta strand
Show more details
Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Helixi27 – 359Combined sources

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
EntryMethodResolution (Å)ChainPositionsPDBsum
1T51NMR-A24-36[»]
1T52NMR-A24-36[»]
1T54NMR-A24-36[»]
1T55NMR-A24-36[»]
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiQ8MMJ7.

Family & Domainsi

Sequence similaritiesi

Keywords - Domaini

Signal, Transmembrane

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

Q8MMJ7-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MKTQFAILLV ALVLFQMFAQ SDAILGKIWE GIKSLFGKRG LSDLDGLDEL
60
FDGEISKADR DFLRELMR
Length:68
Mass (Da):7,722
Last modified:October 1, 2002 - v1
Checksum:iFAFBC86E52583297
GO

Mass spectrometryi

Molecular mass is 1502.00 Da from positions 24 - 36. Determined by MALDI. 1 Publication
Molecular mass is 1502.9 Da from positions 24 - 36. Determined by MALDI. 1 Publication
Molecular mass is 1242.80 Da from positions 24 - 34. Determined by MALDI. 1 Publication

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF397895 mRNA. Translation: AAM76913.1.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF397895 mRNA. Translation: AAM76913.1.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
EntryMethodResolution (Å)ChainPositionsPDBsum
1T51NMR-A24-36[»]
1T52NMR-A24-36[»]
1T54NMR-A24-36[»]
1T55NMR-A24-36[»]
ModBaseiSearch...
MobiDBiSearch...

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Miscellaneous databases

EvolutionaryTraceiQ8MMJ7.

Family and domain databases

ProtoNetiSearch...

Publicationsi

  1. "Purification, structure-function analysis, and molecular characterization of novel linear peptides from scorpion Opisthacanthus madagascariensis."
    Dai L., Corzo G., Naoki H., Andriantsiferana M., Nakajima T.
    Biochem. Biophys. Res. Commun. 293:1514-1522(2002) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [MRNA], PROTEIN SEQUENCE OF 24-34, MASS SPECTROMETRY, SYNTHESIS.
    Tissue: Venom and Venom gland.
  2. "IsCT, a novel cytotoxic linear peptide from scorpion Opisthacanthus madagascariensis."
    Dai L., Yasuda A., Naoki H., Corzo G., Andriantsiferana M., Nakajima T.
    Biochem. Biophys. Res. Commun. 286:820-825(2001) [PubMed] [Europe PMC] [Abstract]
    Cited for: PROTEIN SEQUENCE OF 24-36, MASS SPECTROMETRY, SYNTHESIS.
    Tissue: Venom.
  3. "Scorpion venom peptides without disulfide bridges."
    Zeng X.C., Corzo G., Hahin R.
    IUBMB Life 57:13-21(2005) [PubMed] [Europe PMC] [Abstract]
    Cited for: NOMENCLATURE.
  4. "Scorpion venom peptides with no disulfide bridges: a review."
    Almaaytah A., Albalas Q.
    Peptides 51:35-45(2014) [PubMed] [Europe PMC] [Abstract]
    Cited for: NOMENCLATURE.
  5. "Antibiotic activity and structural analysis of the scorpion-derived antimicrobial peptide IsCT and its analogs."
    Lee K., Shin S.Y., Kim K., Lim S.S., Hahm K.-S., Kim Y.
    Biochem. Biophys. Res. Commun. 323:712-719(2004) [PubMed] [Europe PMC] [Abstract]
    Cited for: STRUCTURE BY NMR OF 24-36, MUTAGENESIS OF TRP-29; GLU-30; GLY-31 AND SER-34.

Entry informationi

Entry nameiNDB41_OPIMA
AccessioniPrimary (citable) accession number: Q8MMJ7
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 1, 2003
Last sequence update: October 1, 2002
Last modified: July 22, 2015
This is version 54 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programAnimal Toxin Annotation Program

Miscellaneousi

Keywords - Technical termi

3D-structure, Direct protein sequencing

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  2. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.