Biochemistry of the Contractile Proteins of Smooth Muscle

The sections in this article are: Background on Contractile Mechanism Aspects of Striated Muscle Biochemistry Comparison of Striated and Smooth Muscle Biochemistry Content of Contractile Proteins in Smooth Muscle Actin Tropomyosin Myosin Isolation Physical Properties and Subunit Composition Myosin Fragments ATPase Activity Ca 2+ Binding Thick Filament Formation Immunochemical Properties Actomyosin ATPase Activities Regulation Phosphorylation of Myosin Phosphatase Activity Phosphorylation and the Regulatory Mechanism Other Mechanisms Role of Tropomyosin in the Regulatory Mechanism Summary of the Regulatory Mechanism Correlation of Actomyosin ATPase Activity With In Vivo Functioning Other Protein Components α‐Actinin 130,000 Component 100‐Å Filament Protein