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. 2003 Jan;69(1):524–532. doi: 10.1128/AEM.69.1.524-532.2003

FIG. 4.

FIG. 4.

Cellular location of chlorogenate esterase. The products of the enzyme are metabolized on different sides of the intracellular membrane. QuiA initiates a sequence of reactions that convert quinate to protocatechuate on the outer surface of the membrane. Specific transport systems transfer protocatechuate to the cytosol (9). Metabolism of caffeate in the cystosol is initiated by HcaC, which converts the compound to a thioester of CoA.