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ACTP2_PHYSE
ID   ACTP2_PHYSE             Reviewed;         226 AA.
AC   P0DL56; D2YZQ4; Q8IAE2;
DT   16-SEP-2015, integrated into UniProtKB/Swiss-Prot.
DT   16-SEP-2015, sequence version 1.
DT   03-AUG-2022, entry version 16.
DE   RecName: Full=DELTA-alicitoxin-Pse1b;
DE            Short=DELTA-ALTX-Pse1b;
DE   AltName: Full=Pst-I {ECO:0000303|PubMed:20837039};
DE   Flags: Precursor;
OS   Phyllodiscus semoni (Night anemone).
OC   Eukaryota; Metazoa; Cnidaria; Anthozoa; Hexacorallia; Actiniaria;
OC   Nynantheae; Aliciidae; Phyllodiscus.
OX   NCBI_TaxID=163701;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   TISSUE=Tentacle;
RX   PubMed=20837039; DOI=10.1016/j.toxicon.2010.09.002;
RA   Uechi G., Toma H., Arakawa T., Sato Y.;
RT   "Molecular characterization on the genome structure of hemolysin toxin
RT   isoforms isolated from sea anemone Actineria villosa and Phyllodiscus
RT   semoni.";
RL   Toxicon 56:1470-1476(2010).
RN   [2]
RP   ERRATUM OF PUBMED:20837039.
RA   Uechi G., Toma H., Arakawa T., Sato Y.;
RL   Toxicon 57:625-625(2011).
RN   [3]
RP   REVIEW.
RX   PubMed=19268680; DOI=10.1016/j.toxicon.2009.02.026;
RA   Kristan K.C., Viero G., Dalla Serra M., Macek P., Anderluh G.;
RT   "Molecular mechanism of pore formation by actinoporins.";
RL   Toxicon 54:1125-1134(2009).
CC   -!- FUNCTION: Pore-forming protein that forms cations-selective hydrophilic
CC       pores of around 1 nm and causes hemolysis. Pore formation is a multi-
CC       step process that involves specific recognition of membrane
CC       sphingomyelin (but neither cholesterol nor phosphatidylcholine) using
CC       aromatic rich region and adjacent phosphocholine (POC) binding site,
CC       firm binding to the membrane (mainly driven by hydrophobic
CC       interactions) accompanied by the transfer of the N-terminal region to
CC       the lipid-water interface and finally pore formation after
CC       oligomerization of monomers.
CC   -!- SUBUNIT: Tetramer in the presence of a lipidic interface. Monomer, in
CC       soluble state. {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Secreted {ECO:0000305}. Nematocyst {ECO:0000305}.
CC       Target cell membrane {ECO:0000250}. Note=Forms an alpha-helical
CC       membrane channel in the prey. {ECO:0000250}.
CC   -!- DOMAIN: The N-terminal region, before the pore is formed, is bound to
CC       the lipid membrane. It partitions into the lipid-water interface and
CC       stabilizes the monomeric molecule on the membrane. Finally, it
CC       traverses the bilayer, thus forming the transmembrane pore.
CC       {ECO:0000250|UniProtKB:P61914}.
CC   -!- SIMILARITY: Belongs to the actinoporin family. Sea anemone subfamily.
CC       {ECO:0000305}.
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DR   EMBL; AB512461; BAI70365.1; -; mRNA.
DR   AlphaFoldDB; P0DL56; -.
DR   SMR; P0DL56; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-SubCell.
DR   GO; GO:0042151; C:nematocyst; IEA:UniProtKB-SubCell.
DR   GO; GO:0046930; C:pore complex; IEA:InterPro.
DR   GO; GO:0015267; F:channel activity; IEA:InterPro.
DR   GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR   GO; GO:0006812; P:cation transport; IEA:InterPro.
DR   GO; GO:0044179; P:hemolysis in another organism; IEA:UniProtKB-KW.
DR   GO; GO:0046931; P:pore complex assembly; IEA:InterPro.
DR   Gene3D; 2.60.270.20; -; 1.
DR   InterPro; IPR009104; Anemon_actinoporin-like.
DR   InterPro; IPR015926; Cytolysin/lectin.
DR   Pfam; PF06369; Anemone_cytotox; 1.
DR   SUPFAM; SSF63724; SSF63724; 1.
PE   2: Evidence at transcript level;
KW   Cleavage on pair of basic residues; Cytolysis; Hemolysis; Ion transport;
KW   Membrane; Nematocyst; Secreted; Signal; Target cell membrane;
KW   Target membrane; Toxin; Transmembrane; Transport.
FT   SIGNAL          1..21
FT                   /evidence="ECO:0000255"
FT   PROPEP          22..45
FT                   /evidence="ECO:0000250|UniProtKB:P0DL55"
FT                   /id="PRO_0000433628"
FT   CHAIN           48..226
FT                   /note="DELTA-alicitoxin-Pse1b"
FT                   /id="PRO_0000433629"
FT   REGION          50..59
FT                   /note="Plays an important role in the hemolytic activity"
FT                   /evidence="ECO:0000250|UniProtKB:P07845"
FT   REGION          58..77
FT                   /note="N-terminal region"
FT                   /evidence="ECO:0000250|UniProtKB:P61914"
FT   REGION          152..167
FT                   /note="Trp-rich region, which is important for the binding
FT                   to lipid membrane"
FT                   /evidence="ECO:0000250|UniProtKB:P61914"
FT   BINDING         101
FT                   /ligand="phosphocholine"
FT                   /ligand_id="ChEBI:CHEBI:295975"
FT                   /evidence="ECO:0000250|UniProtKB:P07845"
FT   BINDING         134
FT                   /ligand="phosphocholine"
FT                   /ligand_id="ChEBI:CHEBI:295975"
FT                   /evidence="ECO:0000250|UniProtKB:P07845"
FT   BINDING         152
FT                   /ligand="phosphocholine"
FT                   /ligand_id="ChEBI:CHEBI:295975"
FT                   /evidence="ECO:0000250|UniProtKB:P07845"
FT   BINDING         154
FT                   /ligand="phosphocholine"
FT                   /ligand_id="ChEBI:CHEBI:295975"
FT                   /evidence="ECO:0000250|UniProtKB:P07845"
FT   BINDING         180
FT                   /ligand="phosphocholine"
FT                   /ligand_id="ChEBI:CHEBI:295975"
FT                   /evidence="ECO:0000250|UniProtKB:P07845"
FT   BINDING         184
FT                   /ligand="phosphocholine"
FT                   /ligand_id="ChEBI:CHEBI:295975"
FT                   /evidence="ECO:0000250|UniProtKB:P07845"
FT   SITE            160
FT                   /note="Important in the initial contact with the lipid
FT                   membrane"
FT                   /evidence="ECO:0000250|UniProtKB:P61914"
SQ   SEQUENCE   226 AA;  25167 MW;  7F50634384911137 CRC64;
     MRHFVVFLYM FLALSIPTAF AKKHIVTKKG NHQDITNDNE GENAEKKSAT VAGAVIAGGE
     LALKILTKIL YEIGKIDRKI AIGVDNESGL KWTALNTYYK SGASDVTLPY EVENSKALLY
     TARKSKGPVA RGAVGVLAYK MSSGNTLAVM FSVPFDYNLY SNWWNVKIYD GEKKADEKMY
     NELYNNNNPI KPSTWEKRDL GKDGLKLRGF MTSNGDAKLV IHIEKS
 
 
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