ID KCRB_RABIT Reviewed; 381 AA.
AC P00567;
DT 21-JUL-1986, integrated into UniProtKB/Swiss-Prot.
DT 21-JUL-1986, sequence version 1.
DT 24-JAN-2024, entry version 131.
DE RecName: Full=Creatine kinase B-type;
DE EC=2.7.3.2;
DE AltName: Full=B-CK;
DE AltName: Full=Creatine kinase B chain;
DE AltName: Full=Creatine phosphokinase M-type;
DE Short=CPK-B;
GN Name=CKB;
OS Oryctolagus cuniculus (Rabbit).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC Eutheria; Euarchontoglires; Glires; Lagomorpha; Leporidae; Oryctolagus.
OX NCBI_TaxID=9986;
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA].
RX PubMed=3857581; DOI=10.1073/pnas.82.8.2310;
RA Pickering L., Pang H., Biemann K., Munro H., Schimmel P.;
RT "Two tissue-specific isozymes of creatine kinase have closely matched amino
RT acid sequences.";
RL Proc. Natl. Acad. Sci. U.S.A. 82:2310-2314(1985).
CC -!- FUNCTION: Reversibly catalyzes the transfer of phosphate between ATP
CC and various phosphogens (e.g. creatine phosphate). Creatine kinase
CC isoenzymes play a central role in energy transduction in tissues with
CC large, fluctuating energy demands, such as skeletal muscle, heart,
CC brain and spermatozoa. Acts as a key regulator of adaptive
CC thermogenesis as part of the futile creatine cycle: localizes to the
CC mitochondria of thermogenic fat cells and acts by mediating
CC phosphorylation of creatine to initiate a futile cycle of creatine
CC phosphorylation and dephosphorylation. During the futile creatine
CC cycle, creatine and N-phosphocreatine are in a futile cycle, which
CC dissipates the high energy charge of N-phosphocreatine as heat without
CC performing any mechanical or chemical work.
CC {ECO:0000250|UniProtKB:Q04447}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=ATP + creatine = ADP + H(+) + N-phosphocreatine;
CC Xref=Rhea:RHEA:17157, ChEBI:CHEBI:15378, ChEBI:CHEBI:30616,
CC ChEBI:CHEBI:57947, ChEBI:CHEBI:58092, ChEBI:CHEBI:456216; EC=2.7.3.2;
CC Evidence={ECO:0000250|UniProtKB:Q04447, ECO:0000255|PROSITE-
CC ProRule:PRU10029};
CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:17158;
CC Evidence={ECO:0000250|UniProtKB:Q04447};
CC -!- SUBUNIT: Dimer of identical or non-identical chains, which can be
CC either B (brain type) or M (muscle type). With MM being the major form
CC in skeletal muscle and myocardium, MB existing in myocardium, and BB
CC existing in many tissues, especially brain. Interacts with SLC12A6 (via
CC C-terminus); the interaction may be required for SLC12A6 potassium-
CC chloride cotransport activity (By similarity).
CC {ECO:0000250|UniProtKB:P12277}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm, cytosol
CC {ECO:0000250|UniProtKB:Q04447}. Mitochondrion
CC {ECO:0000250|UniProtKB:Q04447}. Cell membrane
CC {ECO:0000250|UniProtKB:P12277}. Note=Localizes to the mitochondria of
CC thermogenic fat cells via the internal MTS-like signal (iMTS-L) region.
CC {ECO:0000250|UniProtKB:Q04447}.
CC -!- DOMAIN: The internal MTS-like signal (iMTS-L) mediates targeting to
CC mitochondria thermogenic fat cells. {ECO:0000250|UniProtKB:Q04447}.
CC -!- SIMILARITY: Belongs to the ATP:guanido phosphotransferase family.
CC {ECO:0000255|PROSITE-ProRule:PRU00842, ECO:0000255|PROSITE-
CC ProRule:PRU00843}.
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DR EMBL; M11306; AAA31201.1; -; mRNA.
DR PIR; A00678; KIRBCB.
DR RefSeq; NP_001075730.1; NM_001082261.1.
DR AlphaFoldDB; P00567; -.
DR SMR; P00567; -.
DR STRING; 9986.ENSOCUP00000046566; -.
DR PaxDb; 9986-ENSOCUP00000007616; -.
DR GeneID; 100009085; -.
DR KEGG; ocu:100009085; -.
DR CTD; 1152; -.
DR eggNOG; KOG3581; Eukaryota.
DR InParanoid; P00567; -.
DR OrthoDB; 35839at2759; -.
DR Proteomes; UP000001811; Unplaced.
DR GO; GO:0005829; C:cytosol; IEA:UniProtKB-SubCell.
DR GO; GO:0005739; C:mitochondrion; ISS:UniProtKB.
DR GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR GO; GO:0004111; F:creatine kinase activity; ISS:UniProtKB.
DR GO; GO:0007420; P:brain development; ISS:AgBase.
DR GO; GO:0030644; P:intracellular chloride ion homeostasis; ISS:AgBase.
DR GO; GO:0046314; P:phosphocreatine biosynthetic process; IEA:InterPro.
DR GO; GO:0016310; P:phosphorylation; IEA:UniProtKB-KW.
DR CDD; cd00716; creatine_kinase_like; 1.
DR Gene3D; 1.10.135.10; ATP:guanido phosphotransferase, N-terminal domain; 1.
DR Gene3D; 3.30.590.10; Glutamine synthetase/guanido kinase, catalytic domain; 1.
DR InterPro; IPR000749; ATP-guanido_PTrfase.
DR InterPro; IPR022415; ATP-guanido_PTrfase_AS.
DR InterPro; IPR022414; ATP-guanido_PTrfase_cat.
DR InterPro; IPR022413; ATP-guanido_PTrfase_N.
DR InterPro; IPR036802; ATP-guanido_PTrfase_N_sf.
DR InterPro; IPR014746; Gln_synth/guanido_kin_cat_dom.
DR PANTHER; PTHR11547; ARGININE OR CREATINE KINASE; 1.
DR PANTHER; PTHR11547:SF23; CREATINE KINASE B-TYPE; 1.
DR Pfam; PF00217; ATP-gua_Ptrans; 1.
DR Pfam; PF02807; ATP-gua_PtransN; 1.
DR SUPFAM; SSF55931; Glutamine synthetase/guanido kinase; 1.
DR SUPFAM; SSF48034; Guanido kinase N-terminal domain; 1.
DR PROSITE; PS00112; PHOSPHAGEN_KINASE; 1.
DR PROSITE; PS51510; PHOSPHAGEN_KINASE_C; 1.
DR PROSITE; PS51509; PHOSPHAGEN_KINASE_N; 1.
PE 2: Evidence at transcript level;
KW ATP-binding; Cell membrane; Cytoplasm; Kinase; Membrane; Mitochondrion;
KW Nitration; Nucleotide-binding; Phosphoprotein; Reference proteome;
KW Transferase.
FT CHAIN 1..381
FT /note="Creatine kinase B-type"
FT /id="PRO_0000211969"
FT DOMAIN 11..98
FT /note="Phosphagen kinase N-terminal"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00842"
FT DOMAIN 125..367
FT /note="Phosphagen kinase C-terminal"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT REGION 96..123
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 130..138
FT /note="Internal MTS-like signal"
FT /evidence="ECO:0000250|UniProtKB:Q04447"
FT COMPBIAS 96..113
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT BINDING 72
FT /ligand="creatine"
FT /ligand_id="ChEBI:CHEBI:57947"
FT /evidence="ECO:0000250|UniProtKB:P12277"
FT BINDING 128..132
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT BINDING 130
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT BINDING 132
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT BINDING 191
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT BINDING 232
FT /ligand="creatine"
FT /ligand_id="ChEBI:CHEBI:57947"
FT /evidence="ECO:0000250|UniProtKB:P12277"
FT BINDING 236
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT BINDING 285
FT /ligand="creatine"
FT /ligand_id="ChEBI:CHEBI:57947"
FT /evidence="ECO:0000250|UniProtKB:P12277"
FT BINDING 292
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT BINDING 320..325
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT BINDING 320
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT BINDING 335
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00843"
FT MOD_RES 4
FT /note="Phosphoserine"
FT /evidence="ECO:0000250|UniProtKB:P12277"
FT MOD_RES 35
FT /note="Phosphothreonine"
FT /evidence="ECO:0000250|UniProtKB:P12277"
FT MOD_RES 125
FT /note="Phosphotyrosine"
FT /evidence="ECO:0000250|UniProtKB:Q04447"
FT MOD_RES 199
FT /note="Phosphoserine"
FT /evidence="ECO:0000250|UniProtKB:P12277"
FT MOD_RES 269
FT /note="3'-nitrotyrosine"
FT /evidence="ECO:0000250|UniProtKB:Q04447"
FT MOD_RES 309
FT /note="Phosphoserine"
FT /evidence="ECO:0000250|UniProtKB:P07335"
FT MOD_RES 322
FT /note="Phosphothreonine"
FT /evidence="ECO:0000250|UniProtKB:Q04447"
SQ SEQUENCE 381 AA; 42663 MW; 0001F0FF3A1F3F40 CRC64;
MPFSNTHNTL KLRFPAEDEF PDLSAHNNHM AKVLTPEMDA ELRAKSTPSG FTLDDVIQTG
VDNPGHPFIM TVGCVAGDEE SYEAFKELFD PIIEDRHGGY KPSDEHKTDL NPDNLQGGDD
LDPNYVLSSR VRTGRSIRGF CLPPHCSRGE RRAVEKLAVE ALSSLDGDLA GRYYALKSMT
EAEQQQLIDD HFLFDKPVSP LLLASGMARD WPDARGIWHN DNKTFLVWIN EEDHLRVISM
QKGGNMKEVF TRFCNGLTQI ETLFKSKNYE FMWNPHLGYI LTCPSNLGTG LRAGVHIKLP
HLGQHEKFSE VLKRLRLQKR GTGGVDTAAV GGVFDVSNAD RLGFSEVELV QMVVDGVKLL
IEMEQRLEQG QAIDDLMPAQ K
//
