mutase

[myōōtās, -tāz]
n.
  1. Any enzyme that catalyzes the rearrangement of atoms within a molecule, especially one that causes the transfer of a phosphate group from one carbon atom to another.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.