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P2014

Sigma-Aldrich

Phosphorylase Kinase from rabbit muscle

lyophilized powder, ≥60 units/mg protein

Synonym(s):

ATP:phosphorylase-b phosphotransferase, Dephosphophosphorylase kinase

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About This Item

CAS Number:
Enzyme Commission number:
MDL number:
UNSPSC Code:
12352204
NACRES:
NA.54

form

lyophilized powder

specific activity

≥60 units/mg protein

composition

Protein, 20-40% biuret

foreign activity

ATPase ≤0.5%
phosphorylase a ≤1%
phosphorylase b ≤5%

storage temp.

−20°C

General description

Phosphorylase kinase contains four subunits each containing an α, β, γ, and sigma component. The sigma component binds 4 calcium molecules and is termed calmodulin while the γ unit acts as the catalytic subunit.

Application

Phosphorylase kinase from rabbit muscle has been used in a study to assess features of glycogen phosphorylase. It has also been used in a study to investigate the activation of different forms of muscle phosphorylase kinase by actin.

Unit Definition

One unit will form 1.0 μmolar unit of phosphorylase a from phosphorylase b per min at pH 7.7 at 30°C in the presence of ATP.

Physical form

Lyophilized powder containing (NH4)2SO4, sucrose, β-glycerophosphate and dithioerythritol

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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It had long been one of the crucial questions in muscle physiology how glycogenolysis is regulated in connection with muscle contraction, when we found the answer to this question in the last half of the 1960s. By that time, the
G V Silonova et al.
Biokhimiia (Moscow, Russia), 49(1), 127-135 (1984-01-01)
The activation of different forms of muscle phosphorylase kinase by actin has been studied. F-actin which is polymerized by 2 mM MgCl2 is a more effective activator of phosphorylase kinase than F-actin polymerized by 50 mM KCl. There is evidence
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Calcium/calmodulin-stimulated protein kinases can be classified as one of two types - restricted or multifunctional. This family of kinases contains several structural similarities: all possess a calmodulin binding motif and an autoinhibitory region. In addition, all of the calcium/calmodulin-stimulated protein

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