ID   CHSB_IPOCO              Reviewed;         363 AA.
AC   P48394;
DT   01-FEB-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1996, sequence version 1.
DT   25-MAY-2022, entry version 84.
DE   RecName: Full=Chalcone synthase B;
DE            EC=2.3.1.74;
DE   AltName: Full=Naringenin-chalcone synthase B;
DE            Short=CHS-B;
DE   Flags: Fragment;
GN   Name=CHSB;
OS   Ipomoea cordatotriloba (Tievine).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; lamiids; Solanales; Convolvulaceae; Ipomoeeae; Ipomoea.
OX   NCBI_TaxID=35882;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=7724563; DOI=10.1073/pnas.92.8.3338;
RA   Durbin M.L., Learn G.H., Huttley G.A., Clegg M.T.;
RT   "Evolution of the chalcone synthase gene family in the genus Ipomoea.";
RL   Proc. Natl. Acad. Sci. U.S.A. 92:3338-3342(1995).
CC   -!- FUNCTION: The primary product of this enzyme is 4,2',4',6'-
CC       tetrahydroxychalcone (also termed naringenin-chalcone or chalcone)
CC       which can under specific conditions spontaneously isomerize into
CC       naringenin.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=4-coumaroyl-CoA + 2 H(+) + 3 malonyl-CoA = 2',4,4',6'-
CC         tetrahydroxychalcone + 3 CO2 + 4 CoA; Xref=Rhea:RHEA:11128,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:16526, ChEBI:CHEBI:57287,
CC         ChEBI:CHEBI:57355, ChEBI:CHEBI:57384, ChEBI:CHEBI:77645; EC=2.3.1.74;
CC         Evidence={ECO:0000255|PROSITE-ProRule:PRU10023};
CC   -!- PATHWAY: Secondary metabolite biosynthesis; flavonoid biosynthesis.
CC   -!- SIMILARITY: Belongs to the thiolase-like superfamily. Chalcone/stilbene
CC       synthases family. {ECO:0000305}.
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DR   EMBL; U15942; AAC49027.1; -; Genomic_DNA.
DR   AlphaFoldDB; P48394; -.
DR   SMR; P48394; -.
DR   UniPathway; UPA00154; -.
DR   GO; GO:0102128; F:chalcone synthase activity; IEA:UniProtKB-EC.
DR   GO; GO:0016210; F:naringenin-chalcone synthase activity; IEA:UniProtKB-EC.
DR   GO; GO:0009813; P:flavonoid biosynthetic process; IEA:UniProtKB-UniPathway.
DR   Gene3D; 3.40.47.10; -; 2.
DR   InterPro; IPR012328; Chalcone/stilbene_synt_C.
DR   InterPro; IPR001099; Chalcone/stilbene_synt_N.
DR   InterPro; IPR018088; Chalcone/stilbene_synthase_AS.
DR   InterPro; IPR011141; Polyketide_synthase_type-III.
DR   InterPro; IPR016039; Thiolase-like.
DR   PANTHER; PTHR11877; PTHR11877; 1.
DR   Pfam; PF02797; Chal_sti_synt_C; 1.
DR   Pfam; PF00195; Chal_sti_synt_N; 1.
DR   PIRSF; PIRSF000451; PKS_III; 1.
DR   SUPFAM; SSF53901; SSF53901; 2.
DR   PROSITE; PS00441; CHALCONE_SYNTH; 1.
PE   3: Inferred from homology;
KW   Acyltransferase; Flavonoid biosynthesis; Transferase.
FT   CHAIN           1..>363
FT                   /note="Chalcone synthase B"
FT                   /id="PRO_0000215991"
FT   ACT_SITE        170
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU10023"
FT   NON_TER         363
SQ   SEQUENCE   363 AA;  40413 MW;  C7E4838342E575BB CRC64;
     MCTTVTVLTD TWSRREKRFE GHAKILAIGT ATPANWVDQT TYPDFYFRIT NSQHLLDHKE
     KFRRICNKSK IRKRHMILTE ELLKKNPNLC TYNDASLNTR QDILVSEVPK LGKEAAMKAI
     KEWGRPISEI THLVFCTTSG VDMPGADFQL TKLLGLNSSV KRLMMYQQGC NAGAAMLRLA
     KDVAENNKGA RVLVVCSEVM LSVFRGPSLQ QEDNLLAQCL FGDGSAALIV GTDPRPGLET
     PLFELISAAQ TIIPNTDSHL KLHVREMGLT FHCSKAVPTF ITQNVEDCLV KAFEPYGISD
     WNSIFWVLHP GGNAIVDGVE ETLGLAPEKL RASRDVLSGY GNLTSACVLF ILDEVRKKSK
     KDE