C3755

Creatine Phosphokinase from rabbit muscle

Type I, salt-free, lyophilized powder, ≥150 units/mg protein

• Sinonimo/i: ATP: Creatine N-Phosphotransferase, CPK, Creatine Kinase, Phosphocreatine phosphokinase
• Numero CAS: 9001-15-4
• Classificazione EC (Enzyme Commission): 2.7.3.2 (BRENDA, IUBMB)
• Numero CE: 232-585-5
• Numero MDL: MFCD00130876
• Codice UNSPSC: 12352204
• eCl@ss: 32160410
• NACRES: NA.54

Proprietà

• Tipo: Type I
• Livello qualitativo: 200
• Stato: salt-free, lyophilized powder
• Attività specifica: ≥150 units/mg protein
• PM: 80-86.2 kDa
• Solubilità: 0.25 M glycyl-glycine, pH 7.4: soluble 5.0 mg/mL, clear, colorless to slightly yellow
• Attività estranea: ATPase ≤0.01%; Lactic dehydrogenase, hexokinase, myokinase and pyruvate kinase ≤0.001%
• Condizioni di spedizione: wet ice
• Temperatura di conservazione: −20°C

Descrizione

Applicazioni

Molecular Weight: ~81,000
Creatine Phosphokinase is a dimer composed predominantly of the skeletal muscle derived homodimer (MM). CK also exists as a heterodimer (MB) particularly in the myocardium. CK derived from brain tissue consists mainly of the brain source homodimer (BB). The amino acid sequences of the M chain and B chains are about 80% homologous. From the sequence, the molecular weight of the M chain is 43,112.

E^1%₍₂₈₀₎₌ 8.76

pH Optimum: pH 8.8-9.0 for the forward reaction and pH 6.0-7.0 for the reverse reaction.

CK is a cellular enzyme with a wide tissue distribution. Its physiological role is associated with ATP generation for contractile or transport systems. Increased levels of CK are associated with myocardial infarction, muscular dystrophy, hyperthyroidism, pulmonary infarction and cerebrovascular disease. Variations in relative isozyme distribution can provide additional information in the diagnosis of these conditions.

Substrates: Creatine, N-ethylglycocyamine and glyocyamine have been shown to act as substrates for CK. CK is very specific for ATP/ADP.

Inhibitors: ADP is a strong inhibitor of the forward reaction competing with ATP. Divalent cations such as Ca²⁺ (K_i=4.5 mM), Zn²⁺ and Cu²⁺ inhibit CK by competing with Mg²⁺. Other inhibitors include acetate, acetylsalicylic acid, adenosine, p-aminosalicylic acid, AMP, benzoic acid, bicarbonate, bromide, chloride, p-Chloromercuribenzoic acid, ethylene oxide, 2,4-fluorodinitrobenzene, iodide, malonic acid, NAD, nitrate, phosphate, pyrophosphate, salicylic acid, sulfate, sulfite, thyroxine, trichloroacetate, L-triiodothyroxine, L-triiodothyronine, and tripolyphosphate.

The enzyme from Sigma has been used in the measurement of phosphocreatine in hippocampal neurons isolated from rat brains.[1]

Avvertenza

The use of 0.1% albumin in the reaction buffer is recommended to avoid inactivation due to dilution.

Definizione di unità

One unit will transfer 1.0 μmole of phosphate from phosphocreatine to ADP per min at pH 7.4 at 30 °C.

Nota sulla preparazione

Produces a clear, colorless to light yellow solution at 5 mg/mL in 0.25 M glycyl-glycine, pH 7.4

Risultati analitici

Protein determined by biuret.

Informazioni sulla sicurezza

• Codice della classe di stoccaggio: 11 - Combustible Solids
• Classe di pericolosità dell'acqua (WGK): WGK 3
• Punto d’infiammabilità (°F): Not applicable
• Punto d’infiammabilità (°C): Not applicable
• Dispositivi di protezione individuale: Eyeshields, Gloves, type N95 (US)