CIRE_CHAPA
ID CIRE_CHAPA Reviewed; 30 AA.
AC P84643;
DT 13-SEP-2005, integrated into UniProtKB/Swiss-Prot.
DT 13-SEP-2005, sequence version 1.
DT 25-MAY-2022, entry version 38.
DE RecName: Full=Circulin-E;
DE Short=CIRE;
OS Chassalia parviflora.
OC Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC asterids; lamiids; Gentianales; Rubiaceae; Rubioideae; Palicoureeae;
OC Chassalia.
OX NCBI_TaxID=58431;
RN [1] {ECO:0000305}
RP PROTEIN SEQUENCE, FUNCTION, AND MASS SPECTROMETRY.
RX PubMed=10691702; DOI=10.1021/np990432r;
RA Gustafson K.R., Walton L.K., Sowder R.C. Jr., Johnson D.G., Pannell L.K.,
RA Cardellina J.H. Jr., Boyd M.R.;
RT "New circulin macrocyclic polypeptides from Chassalia parvifolia.";
RL J. Nat. Prod. 63:176-178(2000).
CC -!- FUNCTION: Probably participates in a plant defense mechanism. Inhibits
CC the cytopathic effects of the human immunodeficiency virus.
CC {ECO:0000255|PROSITE-ProRule:PRU00395, ECO:0000269|PubMed:10691702,
CC ECO:0000305}.
CC -!- DOMAIN: The presence of a 'disulfide through disulfide knot'
CC structurally defines this protein as a knottin.
CC {ECO:0000250|UniProtKB:P56871}.
CC -!- PTM: This is a cyclic peptide. {ECO:0000255|PROSITE-ProRule:PRU00395,
CC ECO:0000269|PubMed:10691702}.
CC -!- MASS SPECTROMETRY: Mass=3396.4; Method=FAB;
CC Evidence={ECO:0000269|PubMed:10691702};
CC -!- SIMILARITY: Belongs to the cyclotide family. Bracelet 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; P84643; -.
DR SMR; P84643; -.
DR GO; GO:0006952; P:defense response; IDA:UniProtKB.
DR GO; GO:0050688; P:regulation of defense response to virus; IEA:UniProtKB-KW.
DR InterPro; IPR005535; Cyclotide.
DR InterPro; IPR012323; Cyclotide_bracelet_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; PS60008; CYCLOTIDE_BRACELET; 1.
PE 1: Evidence at protein level;
KW Antiviral protein; Direct protein sequencing; Disulfide bond; Knottin;
KW Plant defense.
FT PEPTIDE 1..30
FT /note="Circulin-E"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00395,
FT ECO:0000269|PubMed:10691702"
FT /id="PRO_0000043602"
FT DISULFID 4..20
FT /evidence="ECO:0000250|UniProtKB:P56871,
FT ECO:0000255|PROSITE-ProRule:PRU00395"
FT DISULFID 8..22
FT /evidence="ECO:0000250|UniProtKB:P56871,
FT ECO:0000255|PROSITE-ProRule:PRU00395"
FT DISULFID 13..27
FT /evidence="ECO:0000250|UniProtKB:P56871,
FT ECO:0000255|PROSITE-ProRule:PRU00395"
FT CROSSLNK 1..30
FT /note="Cyclopeptide (Lys-Asp)"
FT /evidence="ECO:0000269|PubMed:10691702"
SQ SEQUENCE 30 AA; 3420 MW; 87DCB2598B2005D7 CRC64;
KIPCGESCVW IPCLTSVFNC KCENKVCYHD