<biochemistry> A dimer in which the two subunits are different.

One of the best known examples is tubulin that is found as an _ tubulin/_ tubulin dimer. Heterodimers are relatively common and it may be that the arrangement has the advantage that, for example: several different binding subunits may interact with a conserved signalling subunit.

This entry appears with permission from the Dictionary of Cell and Molecular Biology

(11 Mar 2008)