allosterism

[ăl′ō-stĕrĭz′əm]
n.
  1. A change in the activity and conformation of an enzyme resulting from the binding of a compound at a site on the enzyme other than the active binding site.
Related formsal′lo•steric (ăl′ō-stĕrĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.