Tropomyosin is a protein found in both skeletal and smooth muscle, but the mrna produced in each of these is different in composition even though they are transcribed from the same gene. This observation is explained by a mechanism in eukaryotic cells known as alternative splicing.
All living things have organelles that keep their cells physically intact. The term "cytoskeleton" refers to this class of organelles as a whole, and one of the earliest known systems is based on filamentous polymers of the protein actin. Tropomyosin, a second protein polymer, is a crucial component of the majority of animal actin filaments.
Actin filament function is tightly regulated by a wide family of proteins called tropomyosins, which are present in both muscle and non-muscle cells. These proteins are found along the -helical groove of the majority of actin filaments as rod-shaped coiled-coil hetero- or homo-dimers. Along the length of the actin filament, dimers interact, aligning themselves head to tail.
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