[troh-puh-nin, trop-uh-]

Origin of troponin

1965–70; tropo(myosin) (see tropo-, myosin) + -n- (of uncertain origin) + -in2

troponin I

[troh-puh-nin ahy, trop-uh-]
noun Biochemistry.
  1. a protein within a troponin complex that helps regulate the heartbeat and can be used as an indicator of myocardial infarction. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

troponin in Medicine


[trōpə-nĭn, trŏpə-]
  1. A calcium-regulated protein in muscle tissue occurring in three subunits with tropomyosin.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

troponin in Science


[trōpə-nĭn, trŏpə-]
  1. One of the proteins that make up the thin filaments of muscle tissue and that regulate muscle contraction and relaxation. Troponin occurs in three forms bound together in a complex. One of the three forms is a receptor of calcium ions that induces structural changes that allow the actin in the thin filaments to interact with myosin, causing contraction.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.