allosteric

al·lo·ster·ic   (āl'ə-stěr'ĭk)    adj.  Of or involving a change in the shape and activity of an enzyme that results from molecular binding with a regulatory substance at a site other than the enzymatically active one. al'lo·ster'i·cal·ly adv., al·los'ter·y (ə-lŏs'tə-rē) n.

Main Entry: al·lo·ste·ric
Pronunciation: "al-O-'ster-ik, -'sti(&)r-
Function: adjective
: of, relating to, or being a change in theshape and activity of a protein (as an enzyme) that results from combination with another substance at a point other than the chemically active site —al·lo·ste·ri·cal·ly /-i-k(&-)lE/ adverb —al·lo·ste·ry /'al-O-"ster-E,-"sti(&)r-/ noun plural -ries