This effect of
TK on carbon allocation may be due to its central location in the C3
cycle where it catalyzes the reversible transfer of a two-carbon
molecule to glyceraldehyde 3-phosphate (G3P) (acceptor) from sedoheptulose 7-phosphate, generating xylulose 5-phosphate
(Xu5P) and ribose 5-phosphate; or fructose 6-phosphate to produce
Xu5P and erythrose 4-phosphate