Hydroxymethylpyrimidine-binding protein (ThiY) (ThiY)

Hydroxymethylpyrimidine-binding protein (ThiY) is a specialized periplasmic binding protein primarily found in bacteria and some archaea [1, 7]. It serves as the substrate-recognition component of the ThiXYZ ATP-binding cassette (ABC) transporter system, which facilitates the uptake of hydroxymethylpyrimidine (HMP) and its precursors, such as N-formyl-4-amino-5-aminomethyl-2-methylpyrimidine (FAMP) [7, 9]. These molecules are critical intermediates in the salvage and biosynthesis of thiamine (Vitamin B1), an essential cofactor for enzymes involved in carbohydrate and amino acid metabolism [1, 6]. Since humans do not possess the machinery to synthesize or salvage thiamine precursors in this manner, ThiY is considered a promising target for the development of narrow-spectrum or novel antimicrobial drugs [1, 3]. Targeting ThiY aims to disrupt the pathogen's thiamine supply, leading to metabolic arrest and cell death, particularly in environments where de novo thiamine synthesis is restricted [1, 11]. Research into ThiY inhibitors focuses on HMP analogs, such as CF3-HMP, that can competitively bind the protein or block the transport channel [1, 3]. The protein's structure, characterized by a typical periplasmic binding protein fold, provides a clear template for structure-based drug design [7, 9]. Overall, ThiY represents a strategic vulnerability in bacterial metabolism that can be exploited for therapeutic intervention against infectious diseases [1, 12].

Other names

ThiYYkoFFAMP-binding proteinHydroxymethylpyrimidine-binding periplasmic proteinThiamine/HMP-binding protein

Inhibition of the thiamine salvage pathway by blocking the transport of hydroxymethylpyrimidine (HMP) precursors, leading to thiamine deficiency and metabolic arrest in bacteria.