transportase -->
transport protein
medical dictionary

<protein>

A class of transmembrane protein that allows substances to cross plasma membranes far faster than would be possible by diffusion alone. A major class of transport proteins expend energy to move substances (active transport), these are transport ATPases.

See: facilitated diffusion, symport, antiport.

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

(11 Mar 2008)