different between actin vs profilin

English

From Ancient Greek ????? (aktís, “ray”), based on the shape of the filament formed, and the English chemical suffix -in.

actin (countable and uncountable, plural actins)

(biochemistry, uncountable) 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.
(biochemistry, countable) One of the six isoforms of actin.

profilamentous +? -in

profilin (countable and uncountable, plural profilins)

(biochemistry) An actin-binding protein involved in the dynamic turnover and restructuring of the actin cytoskeleton, found in all eukaryotic organisms in most cells.

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