Glycine cleavage system H protein, mitochondrial (GCSH)

Glycine cleavage system H protein, mitochondrial (GCSH), is a lipoic acid-containing protein essential for mitochondrial glycine degradation as part of the glycine cleavage system. It acts as a shuttle, transferring the methylamine group from glycine (via the P-protein) to the T-protein, and is pivotal for proper cellular one-carbon metabolism and energy management. GCSH is necessary for protein lipoylation of additional mitochondrial enzymes, affecting the tricarboxylic acid (TCA) cycle. Mutations cause nonketotic hyperglycinemia, a rare but severe metabolic disorder[1][2][4][5][6][10]. GCSH is an essential mitochondrial protein but, unlike classic drug targets (e.g., receptors, enzymes, ion channels), is not currently considered a direct therapeutic target[1][2][10]. There are no approved drugs that specifically target or modulate this protein[1]. Safety concerns relate to systemic loss of function, not drug-based modulation.

Other names

Lipoic acid-containing proteinH proteinGlycine cleavage system H-proteinGCVH

No drugs are known to directly inhibit or therapeutically target GCSH. The biological activity involves cofactor (lipoic acid) shuttling, not classic receptor or enzyme inhibition[1].