Renal proximal tubular sulfhydryl group-containing membrane proteins

Renal proximal tubular sulfhydryl group-containing membrane proteins are a collection of membrane-bound proteins in the kidney's cortex that possess reactive thiol (-SH) groups essential for their function (Zalups, 2000, Pharmacological Reviews). These proteins include critical transporters and enzymes such as Na+/K+-ATPase and Aquaporin-1, which facilitate the reabsorption of water and solutes from the glomerular filtrate (Preston et al., 1991, Science). Historically, these sulfhydryl groups were the primary pharmacological targets for organomercurial diuretics like mersalyl, which inhibited sodium reabsorption by forming covalent mercaptide bonds with the protein thiols (Weiner & Mudge, 1964, American Journal of Medicine). In modern toxicology, these proteins are recognized as the main sites for the accumulation and toxic action of heavy metals, particularly inorganic mercury and cadmium (Nigam et al., 2014, Nature Reviews Nephrology). The binding of these metals to the sulfhydryl groups leads to protein denaturation, loss of transport function, and subsequent nephrotoxicity. Because this target refers to a broad physiological class rather than a single molecular entity, it is primarily used to describe the mechanism of thiol-reactive agents in the renal cortex.

Other names

Renal membrane thiolsProximal tubule SH-proteinsMercury-binding renal proteinsThiol-containing renal transporters

Inhibition of renal transport through covalent modification of protein thiol groups.