ID   VARB_VIOAR              Reviewed;          30 AA.
AC   P58447;
DT   05-DEC-2001, integrated into UniProtKB/Swiss-Prot.
DT   05-DEC-2001, sequence version 1.
DT   25-MAY-2022, entry version 53.
DE   RecName: Full=Varv peptide B;
OS   Viola arvensis (European field pansy) (Field violet).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   rosids; fabids; Malpighiales; Violaceae; Viola.
OX   NCBI_TaxID=97415;
RN   [1]
RP   PROTEIN SEQUENCE, AND MASS SPECTROMETRY.
RX   PubMed=10075760; DOI=10.1021/np9803878;
RA   Goeransson U., Luijendijk T., Johansson S., Bohlin L., Claeson P.;
RT   "Seven novel macrocyclic polypeptides from Viola arvensis.";
RL   J. Nat. Prod. 62:283-286(1999).
CC   -!- FUNCTION: Probably participates in a plant defense mechanism.
CC   -!- DOMAIN: The presence of a 'disulfide through disulfide knot'
CC       structurally defines this protein as a knottin.
CC   -!- PTM: This is a cyclic peptide.
CC   -!- MASS SPECTROMETRY: Mass=3087; Mass_error=3; Method=MALDI;
CC       Evidence={ECO:0000269|PubMed:10075760};
CC   -!- SIMILARITY: Belongs to the cyclotide family. Moebius subfamily.
CC       {ECO:0000255|PROSITE-ProRule:PRU00395}.
CC   -!- CAUTION: This peptide is cyclic. The start position was chosen by
CC       similarity to OAK1 (kalata-B1) for which the DNA sequence is known.
CC       {ECO:0000305}.
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DR   AlphaFoldDB; P58447; -.
DR   SMR; P58447; -.
DR   GO; GO:0006952; P:defense response; ISS:UniProtKB.
DR   InterPro; IPR005535; Cyclotide.
DR   InterPro; IPR012324; Cyclotide_moebius_CS.
DR   InterPro; IPR036146; Cyclotide_sf.
DR   Pfam; PF03784; Cyclotide; 1.
DR   PIRSF; PIRSF037891; Cycloviolacin; 1.
DR   SUPFAM; SSF57038; SSF57038; 1.
DR   PROSITE; PS51052; CYCLOTIDE; 1.
DR   PROSITE; PS60009; CYCLOTIDE_MOEBIUS; 1.
PE   1: Evidence at protein level;
KW   Direct protein sequencing; Disulfide bond; Knottin; Plant defense.
FT   PEPTIDE         1..30
FT                   /note="Varv peptide B"
FT                   /id="PRO_0000043623"
FT   DISULFID        5..19
FT   DISULFID        9..21
FT   DISULFID        14..27
FT   CROSSLNK        1..30
FT                   /note="Cyclopeptide (Gly-Asn)"
SQ   SEQUENCE   30 AA;  3094 MW;  7B09691FEBAD26EE CRC64;
     GLPVCGETCF GGTCNTPGCS CDPWPMCSRN