Fig. 3. Summary of the hypothetical feedback inhibition mechanism of folate biosynthesis in lactic acid bacteria. GTP, guanosine triphosphate; PABA, para-aminobenzoic acid; HPPK, hydroxymethyl dihydropterin pyrophosphokinase; DHPPP, 6-hydroxymethyl-7,8-dihydropterin pyrophosphate; DHPS, dihydropteroate synthase; DHFR, dihydrofolate reductase.
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