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Information on EC 2.7.11.11 - cAMP-dependent protein kinase

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EC Tree
IUBMB Comments
This eukaryotic enzyme recognizes the sequence -Arg-Arg-X-Ser*/Thr*-Hpo, where * indicates the phosphorylated residue and Hpo indicates a hydrophobic residue.The inactive holoenzyme is a heterotetramer composed of two regulatory (R) subunits and two catalytic (C) subunits. Each R subunit occludes the active site of a C subunit and contains two binding sites for 3',5'-cyclic-AMP (cAMP). Binding of cAMP activates the enzyme by causing conformational changes that release two free monomeric C subunits from a dimer of the R subunits, i.e. R2C2 + 4 cAMP = R2(cAMP)4 + 2 C. Activity requires phosphorylation of a conserved Thr in the activation loop (T-loop) sequence (Thr198 in human Calpha; Thr224 in budding yeast Tpk2), installed by auto-phosphorylation or by the 3-phosphoinositide-dependent protein kinase-1 (PDPK1). Certain R2C2 combinations can be localized to particular subcellular regions by their association with diverse species of 'A Kinase-Anchoring Proteins' (AKAPs). The enzyme has been characterized from many organisms. Humans have three C units (Calpha, Cbeta, and Cgamma) encoded by the paralogous genes PRKACA, PRKACB and PRKACG, respectively, and four R subunits (R1alpha, RIbeta, RIIalpha and RIIbeta), encoded by PKRAR1A, PKRAR1B, PKRAR2A and PKRAR2B, respectively. Yeast (Saccharomyces cerevisiae) has three C subunits (Tpk1, Tpk2, and Tpk3) encoded by the paralogous genes TPK1, TPK2 and TPK3, respectively, and a single R subunit (Bcy1) encoded by the BCY1 gene. Some validated substrates of the enzyme include cAMP-response element-binding protein (CREB), phosphorylase kinase alpha subunit (PHKA), and tyrosine 3-monooxygenase (TH) in mammals; Adr1, Whi3, Nej1, and Pyk1 in yeast.
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This record set is specific for:
UNIPROT: P61925
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Word Map
The expected taxonomic range for this enzyme is: Eukaryota, Archaea, Bacteria
Reaction Schemes
+
a [protein]-(L-serine/L-threonine)
=
+
a [protein]-(L-serine/L-threonine) phosphate
Synonyms
camp-dependent protein kinase, a kinase, cyclic amp-dependent protein kinase, camp-pka, camp/protein kinase a, capk, prkaca, camp dependent protein kinase, camp-dependent pka, cyclic amp-dependent protein kinase a, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
PKAc
catalytic subunit
A kinase
-
-
-
-
ATP:protein phosphotransferase (cAMP-dependent)
-
-
-
-
cAMP-dependent protein kinase
-
-
-
-
PK-25
-
-
-
-
PKA
-
-
-
-
PKA C-alpha
-
-
-
-
PKA C-beta
-
-
-
-
PKA C-gamma
-
-
-
-
PKA catalytic (C) subunit
-
-
-
-
protein kinase A
-
-
-
-
SYSTEMATIC NAME
IUBMB Comments
ATP:protein Ser/Thr-phosphotransferase (3',5'-cAMP-dependent)
This eukaryotic enzyme recognizes the sequence -Arg-Arg-X-Ser*/Thr*-Hpo, where * indicates the phosphorylated residue and Hpo indicates a hydrophobic residue.The inactive holoenzyme is a heterotetramer composed of two regulatory (R) subunits and two catalytic (C) subunits. Each R subunit occludes the active site of a C subunit and contains two binding sites for 3',5'-cyclic-AMP (cAMP). Binding of cAMP activates the enzyme by causing conformational changes that release two free monomeric C subunits from a dimer of the R subunits, i.e. R2C2 + 4 cAMP = R2(cAMP)4 + 2 C. Activity requires phosphorylation of a conserved Thr in the activation loop (T-loop) sequence (Thr198 in human Calpha; Thr224 in budding yeast Tpk2), installed by auto-phosphorylation or by the 3-phosphoinositide-dependent protein kinase-1 (PDPK1). Certain R2C2 combinations can be localized to particular subcellular regions by their association with diverse species of 'A Kinase-Anchoring Proteins' (AKAPs). The enzyme has been characterized from many organisms. Humans have three C units (Calpha, Cbeta, and Cgamma) encoded by the paralogous genes PRKACA, PRKACB and PRKACG, respectively, and four R subunits (R1alpha, RIbeta, RIIalpha and RIIbeta), encoded by PKRAR1A, PKRAR1B, PKRAR2A and PKRAR2B, respectively. Yeast (Saccharomyces cerevisiae) has three C subunits (Tpk1, Tpk2, and Tpk3) encoded by the paralogous genes TPK1, TPK2 and TPK3, respectively, and a single R subunit (Bcy1) encoded by the BCY1 gene. Some validated substrates of the enzyme include cAMP-response element-binding protein (CREB), phosphorylase kinase alpha subunit (PHKA), and tyrosine 3-monooxygenase (TH) in mammals; Adr1, Whi3, Nej1, and Pyk1 in yeast.
CAS REGISTRY NUMBER
COMMENTARY hide
142008-29-5
-
142008-29-5
cAMP-dependent protein kinase
SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
ATP + SP20 protein
ADP + phosphorylated SP20 protein
show the reaction diagram
i.e. TTYADFIASGRTGRRASIHD
-
-
?
NATURAL SUBSTRATE
NATURAL PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
ATP + SP20 protein
ADP + phosphorylated SP20 protein
show the reaction diagram
i.e. TTYADFIASGRTGRRASIHD
-
-
?
METALS and IONS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
Mg2+
activates
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
beta,gamma-methyleneadenosine 5'-triphosphate
-
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
-
UniProt
Manually annotated by BRENDA team
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
IPKA_HUMAN
76
0
7989
Swiss-Prot
-
CRYSTALLIZATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
in complex with Mg2+ and beta,gamma-methyleneadenosine 5'-triphosphate, sitting drop vapor diffusion method, using 100 mM MES (pH 6.5), 5 mM dithiothreitol, and 15-20% (w/v) PEG 4000 at 4-14°C
PURIFICATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
HisTrap column chromatography
CLONED (Commentary)
ORGANISM
UNIPROT
LITERATURE
expressed in Escherichia coli
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Gerlits, O.; Waltman, M.J.; Taylor, S.; Langan, P.; Kovalevsky, A.
Insights into the phosphoryl transfer catalyzed by cAMP-dependent protein kinase: an X-ray crystallographic study of complexes with various metals and peptide substrate SP20
Biochemistry
52
3721-3727
2013
Homo sapiens (P61925)
Manually annotated by BRENDA team