Triosephosphate isomerase (TIM) is a glycolytic enzyme that catalyzes the interconversion of dihydroxyacetone phosphate and D-glyceraldehyde-3-phosphate. The reaction is very efficient and requires neither cofactors nor metal ions. TIM, usually homodimeric, but in some organisms tetrameric, is ubiqitous and conserved in function across eukaryotes, bacteria and archaea.
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