ID   DFSD2_HELAN             Reviewed;          78 AA.
AC   P82659;
DT   01-DEC-2000, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-2000, sequence version 1.
DT   03-AUG-2022, entry version 73.
DE   RecName: Full=Defensin SD2;
DE   AltName: Full=Flower-specific gamma-thionin;
DE   Flags: Precursor;
GN   Name=SD2;
OS   Helianthus annuus (Common sunflower).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; campanulids; Asterales; Asteraceae; Asteroideae;
OC   Heliantheae alliance; Heliantheae; Helianthus.
OX   NCBI_TaxID=4232;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   TISSUE=Flower;
RA   Urdangarin M.C., de la Canal L.;
RT   "A defensin gene expressed in sunflower inflorescence.";
RL   Plant Physiol. Biochem. 38:253-258(2000).
CC   -!- FUNCTION: May play a protective role in flowers by protecting the
CC       reproductive organs from potential pathogen attack.
CC   -!- SUBCELLULAR LOCATION: Secreted, cell wall {ECO:0000250}.
CC   -!- TISSUE SPECIFICITY: Highest expression in flowers and to a lesser
CC       extent in leaves. Lower levels in hypocotyls. No expression in roots
CC       and cotyledons.
CC   -!- DEVELOPMENTAL STAGE: Expressed progressively during flower development
CC       reaching the highest level in the mature fertilized flower stage.
CC   -!- SIMILARITY: Belongs to the DEFL family. {ECO:0000305}.
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DR   EMBL; AF178634; AAF72042.1; -; mRNA.
DR   EMBL; AF141131; AAF66591.1; -; mRNA.
DR   AlphaFoldDB; P82659; -.
DR   SMR; P82659; -.
DR   EnsemblPlants; mRNA:HanXRQr2_Chr12g0536651; mRNA:HanXRQr2_Chr12g0536651; HanXRQr2_Chr12g0536651.
DR   Gramene; mRNA:HanXRQr2_Chr12g0536651; mRNA:HanXRQr2_Chr12g0536651; HanXRQr2_Chr12g0536651.
DR   OrthoDB; 1625543at2759; -.
DR   GO; GO:0005576; C:extracellular region; IEA:UniProtKB-KW.
DR   GO; GO:0050832; P:defense response to fungus; IEA:UniProtKB-KW.
DR   GO; GO:0031640; P:killing of cells of another organism; IEA:UniProtKB-KW.
DR   CDD; cd00107; Knot1; 1.
DR   Gene3D; 3.30.30.10; -; 1.
DR   InterPro; IPR008176; Defensin_plant.
DR   InterPro; IPR003614; Scorpion_toxin-like.
DR   InterPro; IPR036574; Scorpion_toxin-like_sf.
DR   PRINTS; PR00288; PUROTHIONIN.
DR   SMART; SM00505; Knot1; 1.
DR   SUPFAM; SSF57095; SSF57095; 1.
DR   PROSITE; PS00940; GAMMA_THIONIN; 1.
PE   2: Evidence at transcript level;
KW   Antimicrobial; Cell wall; Disulfide bond; Fungicide; Plant defense;
KW   Secreted; Signal.
FT   SIGNAL          1..20
FT                   /evidence="ECO:0000255"
FT   CHAIN           21..78
FT                   /note="Defensin SD2"
FT                   /id="PRO_0000007041"
FT   DISULFID        34..78
FT                   /evidence="ECO:0000250"
FT   DISULFID        45..65
FT                   /evidence="ECO:0000250"
FT   DISULFID        51..72
FT                   /evidence="ECO:0000250"
FT   DISULFID        55..74
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   78 AA;  8627 MW;  1AD6A98582149A2D CRC64;
     MKSSMKMFAA LLLVVMCLLA NEMGGPLVVE ARTCESQSHK FKGTCLSDTN CANVCHSERF
     SGGKCRGFRR RCFCTTHC