ID   MSD3_AMAPH              Reviewed;          32 AA.
AC   A0A023IWK4;
DT   28-MAR-2018, integrated into UniProtKB/Swiss-Prot.
DT   09-JUL-2014, sequence version 1.
DT   25-MAY-2022, entry version 10.
DE   RecName: Full=MSDIN-like toxin proprotein 3 {ECO:0000303|PubMed:24613547};
DE   Contains:
DE     RecName: Full=Toxin MSD3 {ECO:0000305|PubMed:24613547};
DE   Flags: Precursor;
OS   Amanita phalloides (Death cap).
OC   Eukaryota; Fungi; Dikarya; Basidiomycota; Agaricomycotina; Agaricomycetes;
OC   Agaricomycetidae; Agaricales; Amanitaceae; Amanita.
OX   NCBI_TaxID=67723;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA], AND FUNCTION.
RX   PubMed=24613547; DOI=10.1016/j.toxicon.2014.02.020;
RA   Li P., Deng W., Li T.;
RT   "The molecular diversity of toxin gene families in lethal Amanita
RT   mushrooms.";
RL   Toxicon 83:59-68(2014).
CC   -!- FUNCTION: Probable toxin that belongs to the MSDIN-like toxin family
CC       responsible for a large number of food poisoning cases and deaths
CC       (PubMed:24613547). {ECO:0000305|PubMed:24613547}.
CC   -!- PTM: Processed by the macrocyclase-peptidase enzyme POPB to yield a
CC       toxic cyclic heptapeptide (By similarity). POPB first removes 10
CC       residues from the N-terminus (By similarity). Conformational trapping
CC       of the remaining peptide forces the enzyme to release this intermediate
CC       rather than proceed to macrocyclization (By similarity). The enzyme
CC       rebinds the remaining peptide in a different conformation and catalyzes
CC       macrocyclization of the N-terminal 8 residues (By similarity).
CC       {ECO:0000250|UniProtKB:A0A067SLB9}.
CC   -!- SIMILARITY: Belongs to the MSDIN fungal toxin family. {ECO:0000305}.
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DR   EMBL; KF552081; AHB18709.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0A023IWK4; -.
DR   GO; GO:0090729; F:toxin activity; IEA:UniProtKB-KW.
DR   InterPro; IPR027582; Amanitin/phalloidin.
DR   TIGRFAMs; TIGR04309; amanitin; 1.
PE   3: Inferred from homology;
KW   Toxin.
FT   PROPEP          1..10
FT                   /evidence="ECO:0000305|PubMed:24613547"
FT                   /id="PRO_0000443677"
FT   PEPTIDE         11..17
FT                   /note="Toxin MSD3"
FT                   /evidence="ECO:0000305|PubMed:24613547"
FT                   /id="PRO_0000443678"
FT   PROPEP          18..32
FT                   /evidence="ECO:0000305|PubMed:24613547"
FT                   /id="PRO_0000443679"
FT   CROSSLNK        11..17
FT                   /note="Cyclopeptide (Ser-Pro)"
FT                   /evidence="ECO:0000305|PubMed:24613547"
SQ   SEQUENCE   32 AA;  3672 MW;  28D60A5BAE16CBF0 CRC64;
     MSDINATRLP SFFFPIPCIS DDIEMVLTRG ER