Myosin - skeletal muscle S1 fragment (CS-MYS04)

Product Uses

• Measurement of F-actin activated myosin ATPase activity
• Identification/characterization of proteins or small molecules that affect myosin ATPase activity
• Identification/characterization of proteins or small molecules that affect myosin / F- actin interaction 

Materials

Skeletal muscle myosin protein has been purified from rabbit psoas muscle (1, 2). The full length myosin protein was purified with its essential light chains (ELC) and regulatory light chains (RLC). Myosin was then digested with alpha-chymotrypsin to liberate the soluble subfragment-1 (S1) domain, which was isolated by centrifugation (3). The purified myosin S1 fragment has been determined to be biologically active in an Factin activated ATPase assay (see biological activity assay). Rabbit psoas myosin S1 fragment protein is supplied as a white lyophilized powder. 

Storage and Resonstitution

Briefly centrifuge to collect the product at the bottom of the tube. Reconstituting a tube of MYS04 with 75 ul of Milli-Q water will generate a 3.3 mg/ml stock of psoas S1 myosin in the following buffer: 20 mM PIPES pH 7.0, 1 mM EDTA, 5% (w/v) sucrose and 1% (w/v) dextran. The protein should not be exposed to repeated freeze-thaw cycles. The lyophilized protein is stable at 4°C desiccated(<10% humidity) for 1 year. 

Purity

Protein purity is determined by scanning densitometry of Coomassie Blue stained protein on a 4-20% gradient polyacrylamide gel. The myosin and its light chains used to produce the myosin S1 fragment was determined to be 90% pure.