{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nHydroxymethylbilane synthase (HMBS), also known as porphobilinogen deaminase, functions as the indispensable enzyme in the heme biosynthetic pathway by sequentially condensing four porphobilinogen molecules into the linear tetrapyrrole 1‐hydroxymethylbilane—a critical precursor for heme formation. Detailed structural investigations based on X‐ray crystallography and molecular dynamics simulations have revealed that HMBS is organized into three distinct domains housing a covalently bound dipyrromethane cofactor. This cofactor, together with key active‐site residues and dynamic loop movements, orchestrates substrate binding, proton transfer, and product release, thus ensuring the enzyme’s precise catalytic cycle."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nExtensive genetic analyses have uncovered a striking mutational heterogeneity within the HMBS gene, with a multitude of missense, nonsense, splice‐site, and frameshift mutations adversely affecting enzyme stability and catalytic efficiency. These mutations diminish HMBS’s capacity to efficiently process porphobilinogen, further leading to the accumulation of neurotoxic intermediates that underlie the clinical manifestations of acute intermittent porphyria (AIP). Biochemical characterizations of recombinant mutant proteins and population‐based mutation screenings have not only broadened our understanding of the diverse pathogenic mechanisms but also enhanced molecular diagnostic accuracy for AIP."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "19"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its catalytic role, HMBS expression and activity are tightly regulated by diverse physiological and pathological conditions. Alterations in transcriptional control, mRNA stability, and protein degradation—as well as responses to environmental triggers—modulate HMBS levels and thereby influence disease penetrance and severity in AIP. In this context, innovative therapeutic approaches including mRNA‐based interventions and hemin administration have shown promise in restoring enzymatic function and mitigating neurovisceral attacks. 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