BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Myosin motors move on actin filaments, whereas kinesin and dynein motors move on microtubules. These molecular motor proteins all convert the energy from ATP into force and movement on either the actin or microtubule tracks. Myosin and kinesin had a common ancestor related to GTPases, but dynein is an AAA ATPase.

Detailed explanation-2: -Members of two large families of motor proteins-the kinesins and the dyneins-are responsible for powering the variety of movements in which microtubules participate.

Detailed explanation-3: -The first motor protein identified was skeletal muscle myosin, which is responsible for generating the force for muscle contraction. This myosin, called myosin II (see below) is an elongated protein that is formed from two heavy chains and two copies of each of two light chains.

Detailed explanation-4: -Actin filaments, usually in association with myosin, are responsible for many types of cell movements. Myosin is the prototype of a molecular motor-a protein that converts chemical energy in the form of ATP to mechanical energy, thus generating force and movement.