Pantothenic acid biosynthesis pathway

The **pantothenic acid biosynthesis pathway** refers to the series of enzymatic reactions by which certain bacteria, fungi, and plants synthesize **pantothenic acid** (vitamin B5) de novo from precursors such as β-alanine and α-ketoisovalerate. This vitamin is an essential precursor for the production of **coenzyme A** (CoA), which plays a central role in energy metabolism and fatty acid synthesis. The canonical steps include conversion by ketopantoate hydroxymethyltransferase, ketopantoate reductase, l-aspartate decarboxylase (for β-alanine), and condensation by pantothenate synthetase. In animals—including humans—pantothenic acid must be obtained through diet because they lack these synthetic enzymes. The uniqueness of this metabolic route in many pathogens makes its components attractive targets for novel antibiotics; however, "pantothenic acid biosynthesis pathway" itself is not a single molecular entity but rather a collection of enzymatic activities forming a metabolic route[1][2][3][4]. Note: This entry describes an entire biochemical *pathway*, not an individual molecule or receptor; thus it does not fit standard definitions used for therapeutic targets such as receptors or single proteins/enzymes.

Other names

Pantothenate biosynthesis pathwayVitamin B5 biosynthesis pathwayCoenzyme A precursor synthesis pathway

Experimental antimicrobials may inhibit specific enzymes in the bacterial pantothenate or coenzyme A biosynthetic pathways, thereby blocking essential metabolic functions and leading to cell death or growth arrest[1].