PBEF Inhibitors

PBEF inhibitors pertain to a class of chemical compounds that inhibit the activity of the enzyme known as Pre-B cell colony-enhancing factor (PBEF), which is also frequently referred to as Nicotinamide phosphoribosyltransferase (NAMPT). NAMPT is a crucial enzyme in the Nicotinamide Adenine Dinucleotide (NAD+) biosynthesis pathway, catalyzing the condensation of nicotinamide with 5-phosphoribosyl-1-pyrophosphate, yielding nicotinamide mononucleotide, an immediate precursor of NAD+. NAD+ is an essential cofactor in cellular redox reactions and a substrate for NAD+-consuming enzymes, playing pivotal roles in various biological processes including metabolism, cell survival, and aging. Thus, PBEF/NAMPT, as a key component in maintaining the cellular NAD+ pool, becomes a point of interest in understanding various biochemical pathways. The interest in PBEF inhibitors is closely tied to the modulation of NAD+ biosynthesis, as altering NAD+ levels can impact numerous cellular processes. These inhibitors can interact with PBEF/NAMPT and obstruct its enzymatic function, leading to altered intracellular NAD+ levels, which subsequently influence sirtuin activity, cellular metabolism, and other NAD+-dependent cellular functions. In terms of chemical structure, PBEF inhibitors can vary widely, but they often target the binding site of the enzyme, interfering with its ability to catalyze its substrate. A keen understanding of the structure and function of NAMPT and its role in the complex network of biochemical pathways is vital for exploring the intricate biochemical repercussions of inhibiting this enzyme, beyond merely reducing the available NAD+ pool.