P6635

Phosphorylase b from rabbit muscle

lyophilized powder, ≥20 units/mg protein, 2× crystallization

• Sinónimos: α-Glucan Phosphorylase, 1,4-α-D-Glucan:orthophosphate α-D-glucosyltransferase, Glycogen Phosphorylase
• Número de CAS: 9012-69-5
• Comisión internacional de enzimas: 2.4.1.1 (BRENDA, IUBMB)
• Número CE: 232-737-0
• Número MDL: MFCD00131905
• Código UNSPSC: 12352204
• NACRES: NA.77

Propiedades

• origen biológico: rabbit muscle
• Formulario: lyophilized powder
• actividad específica: ≥20 units/mg protein
• mol peso: 97,200 Da by calculation
• purificado por: 2× crystallization
• condiciones de almacenamiento: (Keep container tightly closed in a dry and well-ventilated place)
• técnicas: mass spectrometry (MS): suitable
• impurezas: ~0.01 μmol/mg protein 5′-AMP (This low level will not interfere with phosphorylase and phosphorylase kinase assays.)
• Nº de acceso UniProt: A0A5F9CLZ9; A0A5F9CRR0; A0A5F9D1C4; A0A5F9DLL9
• actividad extraña: phosphoglucomutase ≤1.0%; phosphorylase a ≤10%; phosphorylase kinase ≤0.5%; phosphorylase phosphatase, debrancher enzyme, AMPase and ATPase ≤0.1%
• temp. de almacenamiento: −20°C

Descripción

Descripción general

Research area: Cell Signaling

Glycogen phosphorylase (PG), a specialized complex allosteric enzyme has an evolutionarily conserved gene sequence. GP contains a family of three isozymes such as muscle GP (mGP), liver GP (lGP), and brain GP (bGP) in humans.

Aplicación

Phosphorylase b from rabbit muscle has been used:

• in the calibration of Sepharose C1-6B columns while studying the molecular weight of methylamine dehydrogenase subunits
• in ion mobility-mass spectrometry studies of phosphorylase B ions that have been generated with supercharging reagents, in the charge-reducing buffer
• for the preparation of p³² labeled phosphorylase A using phosphorylase kinase and [³²P]ATP
• in phosphorylase phosphatase assay
• in enzyme assay as a positive control to ensure the reaction system for the activity determination was adopted

Acciones bioquímicas o fisiológicas

Phosphorylase b is a non-active form and is present in resting muscles. Phosphorylase b kinase activity increases significantly when the Mg²⁺:ATP ratio exceeds 1. The breakdown of ATP during muscle contraction is thought to trigger in vivo conversion of phosphorylase b into a. Phosphorylase b is activated by inosine monophosphate. Glycogen phosphorylase (PG) enzyme plays a vital role in the first step of glycogenolysis. In the initial stage of glycogenolysis, glycogen phosphorylase(GP) breaks α-1,4- -glycosidic bonds, releasing the glucose-1-phosphate (G1P)molecule. When incubated with the proper concentrations of glucose-1-phosphate without the addition of primer, rabbit muscle phosphorylase B was found to be capable of forming protein-bound alpha-1,4 glucosyl chains.

Envase

Package size based on protein content.

Definición de unidad

One unit will form 1.0 μmole of α-D-glucose 1-phosphate from glycogen and orthophosphate in the presence of 5′-AMP, per min at pH 6.8 at 30 °C measured in a system containing phosphoglucomutase, NADP, and glucose 6-phosphate dehydrogenase. (One μmolar unit is equivalent to approx. 45 Cori units.)

Forma física

Lyophilized powder containing lactose, 5′-AMP, and Mg(OAc)₂ (10 μmole per 100 mg protein)

Información de seguridad

• Código de clase de almacenamiento: 11 - Combustible Solids
• Clase de riesgo para el agua (WGK): WGK 3
• Punto de inflamabilidad (°F): Not applicable
• Punto de inflamabilidad (°C): Not applicable
• Equipo de protección personal: Eyeshields, Gloves, type N95 (US)