actin
noun
- motor protein
- protein in Schistosoma mansoni
- protein
Wiktionary
Pronunciation: /ˈæktɪn/
noun
Etymology: From Ancient Greek ἀκτίς (aktís, “ray”), based on the shape of the filament formed, + -in.
- A globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament).
“2012, Elaine N. Marieb & Katja Hoehn, Human Anatomy & Physiology, 8th ed., chapter 9 "Muscles and Muscle Tissue", page 281. Actin has kidney-shaped polypeptide subunits, called globular actin or G actin, which bear the active sites to which the myosin heads attach during contraction.”
- One of the six isoforms of actin.