ID   CDC2B_ANTMA             Reviewed;         280 AA.
AC   Q38773;
DT   15-JUL-1999, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   03-AUG-2022, entry version 102.
DE   RecName: Full=Cell division control protein 2 homolog B;
DE            EC=2.7.11.22;
DE            EC=2.7.11.23;
DE   Flags: Fragment;
GN   Name=CDC2B;
OS   Antirrhinum majus (Garden snapdragon).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; lamiids; Lamiales; Plantaginaceae; Antirrhineae; Antirrhinum.
OX   NCBI_TaxID=4151;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RC   TISSUE=Flower;
RX   PubMed=8837502; DOI=10.2307/3870243;
RA   Fobert P.R., Gaudin V., Lunness P., Coen E.S., Doonan J.H.;
RT   "Distinct classes of cdc2-related genes are differentially expressed during
RT   the cell division cycle in plants.";
RL   Plant Cell 8:1465-1476(1996).
CC   -!- FUNCTION: Plays a key role in the control of the eukaryotic cell cycle.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-
CC         [protein]; Xref=Rhea:RHEA:17989, Rhea:RHEA-COMP:9863, Rhea:RHEA-
CC         COMP:11604, ChEBI:CHEBI:15378, ChEBI:CHEBI:29999, ChEBI:CHEBI:30616,
CC         ChEBI:CHEBI:83421, ChEBI:CHEBI:456216; EC=2.7.11.22;
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-
CC         threonyl-[protein]; Xref=Rhea:RHEA:46608, Rhea:RHEA-COMP:11060,
CC         Rhea:RHEA-COMP:11605, ChEBI:CHEBI:15378, ChEBI:CHEBI:30013,
CC         ChEBI:CHEBI:30616, ChEBI:CHEBI:61977, ChEBI:CHEBI:456216;
CC         EC=2.7.11.22;
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=[DNA-directed RNA polymerase] + ATP = ADP + H(+) + phospho-
CC         [DNA-directed RNA polymerase]; Xref=Rhea:RHEA:10216, Rhea:RHEA-
CC         COMP:11321, Rhea:RHEA-COMP:11322, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:30616, ChEBI:CHEBI:43176, ChEBI:CHEBI:68546,
CC         ChEBI:CHEBI:456216; EC=2.7.11.23;
CC   -!- ACTIVITY REGULATION: Phosphorylation at Tyr-2 inactivates the enzyme,
CC       while phosphorylation at Thr-148 activates it. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the protein kinase superfamily. CMGC Ser/Thr
CC       protein kinase family. CDC2/CDKX subfamily. {ECO:0000305}.
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DR   EMBL; X97638; CAA66234.1; -; mRNA.
DR   PIR; T17116; T17116.
DR   AlphaFoldDB; Q38773; -.
DR   SMR; Q38773; -.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR   GO; GO:0004693; F:cyclin-dependent protein serine/threonine kinase activity; IEA:UniProtKB-EC.
DR   GO; GO:0106310; F:protein serine kinase activity; IEA:RHEA.
DR   GO; GO:0008353; F:RNA polymerase II CTD heptapeptide repeat kinase activity; IEA:UniProtKB-EC.
DR   GO; GO:0007049; P:cell cycle; IEA:UniProtKB-KW.
DR   GO; GO:0051301; P:cell division; IEA:UniProtKB-KW.
DR   GO; GO:0006468; P:protein phosphorylation; IEA:InterPro.
DR   InterPro; IPR011009; Kinase-like_dom_sf.
DR   InterPro; IPR000719; Prot_kinase_dom.
DR   InterPro; IPR008271; Ser/Thr_kinase_AS.
DR   Pfam; PF00069; Pkinase; 1.
DR   SMART; SM00220; S_TKc; 1.
DR   SUPFAM; SSF56112; SSF56112; 1.
DR   PROSITE; PS50011; PROTEIN_KINASE_DOM; 1.
DR   PROSITE; PS00108; PROTEIN_KINASE_ST; 1.
PE   2: Evidence at transcript level;
KW   ATP-binding; Cell cycle; Cell division; Kinase; Mitosis;
KW   Nucleotide-binding; Phosphoprotein; Serine/threonine-protein kinase;
KW   Transferase.
FT   CHAIN           <1..280
FT                   /note="Cell division control protein 2 homolog B"
FT                   /id="PRO_0000085746"
FT   DOMAIN          <1..274
FT                   /note="Protein kinase"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00159"
FT   ACT_SITE        114
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00159,
FT                   ECO:0000255|PROSITE-ProRule:PRU10027"
FT   BINDING         <1..5
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00159"
FT   BINDING         20
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00159"
FT   MOD_RES         2
FT                   /note="Phosphotyrosine"
FT                   /evidence="ECO:0000250"
FT   MOD_RES         148
FT                   /note="Phosphothreonine; by CAK"
FT                   /evidence="ECO:0000250"
FT   NON_TER         1
SQ   SEQUENCE   280 AA;  32167 MW;  EB4F3715A4FFE6CC CRC64;
     AYGVVYKARD IETNEDIALK KIRLEQEDEG VPSTAIREIS LLKEMHHENI VNLKDVVHRE
     KRLYLVFEYL DLDLKKHMDS CPEFSQDLHM VKMFLCQILR GVAYCHSHRV LHRDLKPQNL
     LIDRGSNTIK LADFGLARAF GIPVRTFTHE VVTLWYRAPE VLLGSRHYST PVDVWSVGCI
     FAEMVNQKPL FPGDSEIDEL HKIFRIIGTP NEDIWPGVTS LPDFKSSFPK WPPKELATIV
     PNLGATGLDL LCKMLQLDPS KRITAKKALE HEYFKDIVLP