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EC 2.7.11.19 Details

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EC number

2.7.11.19

Accepted name

phosphorylase kinase

Reaction

2 ATP + phosphorylase b = 2 ADP + phosphorylase a

Other name(s)

dephosphophosphorylase kinase, glycogen phosphorylase kinase, PHK, phosphorylase b kinase, phosphorylase B kinase, phosphorylase kinase (phosphorylating), STK17

Systematic name

ATP:phosphorylase-b phosphotransferase

CAS registry number

9001-88-1

Comment

Requires Ca²⁺ and calmodulin for activity. The enzyme phosphorylates a specific serine residue in each of the subunits of the dimeric phosphorylase b. For muscle phosphorylase but not liver phosphorylase, this is accompanied by a further dimerization to form a tetrameric phosphorylase. The enzyme couples muscle contraction with energy production via glycogenolysis—glycolysis by catalysing the Ca²⁺-dependent phosphorylation and activation of glycogen phosphorylase b [5]. The γ subunit of the tetrameric enzyme is the catalytic subunit.

History

created 1961 as EC 2.7.1.38, transferred 2005 to EC 2.7.11.19

EC Tree

1 Oxidoreductases

1.1 Acting on the CH-OH group of donors

1.2 Acting on the aldehyde or oxo group of donors

1.3 Acting on the CH-CH group of donors

1.4 Acting on the CH-NH₂ group of donors

1.5 Acting on the CH-NH group of donors

1.6 Acting on NADH or NADPH

1.7 Acting on other nitrogenous compounds as donors

1.8 Acting on a sulfur group of donors

1.9 Acting on a heme group of donors

1.10 Acting on diphenols and related substances as donors

1.11 Acting on a peroxide as acceptor

1.11.1 Peroxidases

1.11.2 Peroxygenases

1.12 Acting on hydrogen as donor

1.12.1 With NAD⁺ or NADP⁺ as acceptor

1.12.2 With a cytochrome as acceptor

1.12.5 With a quinone or similar compound as acceptor

1.12.7 With an iron-sulfur protein as acceptor

1.12.98 With other, known, physiological acceptors

1.12.99 With unknown physiological acceptors

1.13 Acting on single donors with incorporation of molecular oxygen (oxygenases)

1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen

1.15 Acting on superoxide as acceptor

1.16 Oxidizing metal ions

1.17 Acting on CH or CH₂ groups

1.18 Acting on iron-sulfur proteins as donors

1.19 Acting on reduced flavodoxin as donor

1.20 Acting on phosphorus or arsenic in donors

1.21 Catalysing the reaction X-H + Y-H = X-Y

1.21.1 With NAD⁺ or NADP⁺ as acceptor

1.21.3 With oxygen as acceptor

1.21.4 With a disulfide as acceptor

1.21.98 With other, known, physiological acceptors

1.21.99 With unknown physiological acceptors

1.22 Acting on halogen in donors

1.23 Reducing C-O-C group as acceptor

1.97 Other oxidoreductases

1.98 Enzymes using H₂ as reductant (deleted subclass)

1.99 Other enzymes using O₂ as oxidant (deleted subclass)

2.1 Transferring one-carbon groups

2.2 Transferring aldehyde or ketonic groups

2.3 Acyltransferases

2.4 Glycosyltransferases

2.5 Transferring alkyl or aryl groups, other than methyl groups

2.6 Transferring nitrogenous groups

2.7 Transferring phosphorus-containing groups

2.7.1 Phosphotransferases with an alcohol group as acceptor

2.7.2 Phosphotransferases with a carboxy group as acceptor

2.7.3 Phosphotransferases with a nitrogenous group as acceptor

2.7.4 Phosphotransferases with a phosphate group as acceptor

2.7.5 Phosphotransferases with regeneration of donors, apparently catalysing intramolecular transfers (deleted sub-subclass)

2.7.6 Diphosphotransferases

2.7.7 Nucleotidyltransferases

2.7.8 Transferases for other substituted phosphate groups

2.7.9 Phosphotransferases with paired acceptors

2.7.10 Protein-tyrosine kinases

2.7.11 Protein-serine/threonine kinases

2.7.11.1 non-specific serine/threonine protein kinase

2.7.11.2 [pyruvate dehydrogenase (acetyl-transferring)] kinase

2.7.11.3 dephospho-[reductase kinase] kinase

2.7.11.4 [3-methyl-2-oxobutanoate dehydrogenase (acetyl-transferring)] kinase

2.7.11.5 [isocitrate dehydrogenase (NADP⁺)] kinase

2.7.11.6 [tyrosine 3-monooxygenase] kinase

2.7.11.7 myosin-heavy-chain kinase

2.7.11.8 Fas-activated serine/threonine kinase

2.7.11.9 Goodpasture-antigen-binding protein kinase

2.7.11.10 IκB kinase

2.7.11.11 cAMP-dependent protein kinase

2.7.11.12 cGMP-dependent protein kinase

2.7.11.13 protein kinase C

2.7.11.14 rhodopsin kinase

2.7.11.15 β-adrenergic-receptor kinase

2.7.11.16 G-protein-coupled receptor kinase

2.7.11.17 Ca²⁺/calmodulin-dependent protein kinase

2.7.11.18 myosin-light-chain kinase

2.7.11.19 phosphorylase kinase

2.7.11.20 elongation factor 2 kinase

2.7.11.21 polo kinase

2.7.11.22 cyclin-dependent kinase

2.7.11.23 [RNA-polymerase]-subunit kinase

2.7.11.24 mitogen-activated protein kinase

2.7.11.25 mitogen-activated protein kinase kinase kinase

2.7.11.26 tau-protein kinase

2.7.11.27 [acetyl-CoA carboxylase] kinase

2.7.11.28 tropomyosin kinase

2.7.11.29 low-density-lipoprotein receptor kinase

2.7.11.30 receptor protein serine/threonine kinase

2.7.11.31 [hydroxymethylglutaryl-CoA reductase (NADPH)] kinase

2.7.11.32 [pyruvate, phosphate dikinase] kinase

2.7.11.33 [pyruvate, water dikinase] kinase

2.7.11.34 NEK6-subfamily protein kinase

2.7.12 Dual-specificity kinases (those acting on Ser/Thr and Tyr residues)

2.7.13 Protein-histidine kinases

2.7.14 Protein-arginine kinases

2.7.99 Other protein kinases

2.8 Transferring sulfur-containing groups

2.9 Transferring selenium-containing groups

2.10 Transferring molybdenum- or tungsten-containing groups

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Release 2023.1 (January 2023)