GO:0015939 pantothenate metabolic process

Pantothenate metabolic process (GO:0015939) is the biological process comprising the chemical reactions and pathways involving pantothenate, the anion of pantothenic acid, which is the amide of beta-alanine and pantoic acid. Pantothenate, also known as vitamin B5, is a water-soluble B complex vitamin that is a constituent of coenzyme A (CoA) and is distributed ubiquitously in foods. Because CoA is required for acyl-group transfer in fatty acid oxidation, the tricarboxylic acid cycle and numerous biosynthetic reactions, the pathways that supply and metabolize pantothenate sit at the center of cellular energy metabolism. Researchers study GO:0015939 to understand how cells acquire, activate and utilize vitamin B5, and how defects in these steps cause human disease. The term encompasses both the biosynthesis of pantothenate from pantoic acid and beta-alanine and the subsequent conversion of pantothenate into CoA through the canonical kinase-decarboxylase-phosphopantetheine adenylyltransferase-dephospho-CoA kinase (PANK-PPCS-PPAT-DPCK/COASY) route. In mammalian cells, PI3K signaling promotes de novo CoA synthesis from vitamin B5, establishing a direct link between growth-factor signaling and pantothenate utilization. In the gut, commensal Bacteroides species produce pantothenic acid that can alleviate metabolic syndrome in host animals, indicating that microbial pantothenate metabolism is a determinant of systemic metabolic health. Clinically, defective pantothenate metabolism causes neurodegeneration with brain iron accumulation, a group of disorders characterized by iron deposition in the basal ganglia and progressive motor dysfunction. Mutations in PANK2, COASY and related genes impair CoA synthesis and mitochondrial function, and metabolic impairments in these conditions are increasingly well characterized. In cancer and inflammation, the c-Myc-PANK3-EMT axis regulates intestinal barrier structure and function in ulcerative colitis, highlighting the broader relevance of pantothenate pathway enzymes beyond classical CoA biochemistry. This article integrates the QuickGO definition of GO:0015939 with verified PubMed literature to provide a research-grade overview of the pathway, its genes, disease links and experimental models.

GO:0015939 pantothenate metabolic process is defined by QuickGO as the chemical reactions and pathways involving pantothenate, the anion of pantothenic acid, the amide of beta-alanine and pantoic acid. Pantothenate is a B complex vitamin that is a constituent of coenzyme A and is distributed ubiquitously in foods. In practice, the term covers the enzymatic steps that synthesize pantothenate, the transport and salvage of pantothenate, and the conversion of pantothenate into coenzyme A and related CoA derivatives.

Pantothenate metabolic process is important because pantothenate is the obligate precursor of coenzyme A, a cofactor required for fatty acid oxidation, the tricarboxylic acid cycle, acetylcholine synthesis and protein acetylation. PI3K signaling drives de novo CoA synthesis from vitamin B5, so pantothenate metabolism is mechanistically coupled to growth-factor signaling and cellular proliferation. Defects in the pathway cause neurodegeneration with brain iron accumulation, including PKAN and CoPAN, which are progressive and currently without disease-modifying therapy. In the gut, Bacteroides-derived pantothenic acid alleviates metabolic syndrome, and the c-Myc-PANK3-EMT axis regulates intestinal barrier function in ulcerative colitis, showing that pantothenate metabolism influences host metabolism and epithelial biology. Finally, metabolic engineering of microbial chassis cells for d-pantothenate production is an active biotechnology field, making the pathway relevant to industrial biotechnology as well as medicine.

The following genes and proteins are experimentally implicated in pantothenate metabolic process (GO:0015939) and its downstream coenzyme A biosynthesis.

Pantothenate metabolic process is regulated at multiple levels. PI3K signaling drives the de novo synthesis of coenzyme A from vitamin B5, placing the pathway under growth-factor control. The transcription factor c-Myc regulates PANK3, and the c-Myc-PANK3-EMT axis controls intestinal barrier structure and function in ulcerative colitis. Transport of CoA precursors by Opt1 as glutathione mixed disulfides provides an additional regulatory entry point. In neurodegeneration with brain iron accumulation, metabolic impairments reflect loss of PANK2 or COASY function, indicating that pathway flux is sensitive to genetic lesions in its enzymes. Microbial pantothenate supply from gut Bacteroides can also modulate host metabolic state, adding an environmental layer of regulation.

Defective pantothenate metabolism causes neurodegeneration with brain iron accumulation, a group of progressive disorders characterized by iron deposition in the basal ganglia. PANK2 mutations cause pantothenate kinase-associated neurodegeneration (PKAN), and COASY mutations cause CoPAN, both of which impair coenzyme A synthesis. Metabolic impairments in these conditions include altered mitochondrial function and energy metabolism, and they are increasingly characterized in patient models. Because pantothenate is the obligate precursor of CoA, restoring pathway flux is a rational therapeutic strategy under investigation.

Gut commensal Bacteroides-derived pantothenic acid alleviates metabolic syndrome in animal models, linking microbial pantothenate metabolism to host energy homeostasis. This finding suggests that pantothenate metabolic process in the microbiome can influence systemic metabolic phenotypes such as obesity and insulin resistance. The pathway is therefore relevant to both host genetics and microbiome-directed interventions.

The c-Myc-PANK3-EMT axis regulates the structure and function of the intestinal barrier in ulcerative colitis, indicating that pantothenate pathway enzymes contribute to epithelial integrity. PANK3 is a c-Myc target, and its modulation affects epithelial-mesenchymal transition programs in the gut. This connects GO:0015939 to inflammatory bowel disease biology.

PI3K signaling drives de novo coenzyme A synthesis from vitamin B5, and proliferating cells require CoA for fatty acid synthesis and acetylation reactions. Because growth-factor signaling controls pantothenate utilization, the pathway is a candidate node in cancer metabolic reprogramming. Targeting PANK enzymes or downstream CoA synthesis steps is an active area of metabolic oncology research.

RNA-seq and related transcriptomic methods can quantify expression of PANK1, PANK2, PANK3, PPCS, PPAT and COASY across conditions, and have been used to link c-Myc to PANK3 in ulcerative colitis. Transcriptomic profiling of NBIA models can reveal metabolic gene signatures associated with defective pantothenate metabolism. In microbial systems, transcriptomics supports metabolic engineering of chassis cells for d-pantothenate production.

Metabolomics measures pantothenate, 4-phosphopantothenate, dephospho-CoA and CoA levels to assess pathway flux. Metabolic impairments in neurodegeneration with brain iron accumulation have been characterized using metabolomic approaches. PI3K-driven de novo CoA synthesis from vitamin B5 was demonstrated using metabolic labeling and flux analysis.

CRISPR knockout screens can identify genes required for pantothenate-dependent growth and CoA synthesis. Library screening approaches are useful for mapping genetic dependencies in the pathway across cell types. These methods complement targeted knockout and knock-in studies of PANK, PPCS and COASY.

Engineered microbial chassis cells are used to study and optimize d-pantothenate production. Recombinant Escherichia coli grown on chemically defined medium has been used to produce porphyrin derivatives, illustrating microbial metabolic rewiring. Gnotobiotic and Bacteroides knockout models can test whether microbial pantothenic acid alleviates metabolic syndrome.

Researchers studying pantothenate metabolic process-related genes often need to determine whether a candidate gene is causally involved in CoA synthesis, neurodegeneration or metabolic disease. Establishing causality requires precise genetic models in which a single gene can be deleted, mutated, tagged or overexpressed in a controlled cellular background. EDITGENE provides these models for pantothenate pathway genes such as PANK1, PANK2, PANK3, PPCS, PPAT and COASY, enabling reproducible functional studies.

GO:0015939 pantothenate metabolic process is a central metabolic pathway that supplies coenzyme A from vitamin B5 and is regulated by growth-factor signaling, transcription factors and host-microbe interactions. Its dysfunction causes neurodegeneration with brain iron accumulation and is implicated in metabolic syndrome, ulcerative colitis and cancer metabolism. CRISPR-based knockout, point-mutation, knock-in and overexpression models, combined with metabolomics and screening, provide the tools needed to dissect this pathway and to develop therapeutic hypotheses.