PDHX

The pyruvate dehydrogenase (PDH) complex is located in the mitochondrial matrix and catalyzes the conversion of pyruvate to acetyl coenzyme A. The PDH complex thereby links glycolysis to Krebs cycle. The PDH complex contains three catalytic subunits, E1, E2, and E3, two regulatory subunits, E1 kinase and E1 phosphatase, and a non-catalytic subunit, E3 binding protein (E3BP). This gene encodes the E3 binding protein subunit; also known as component X of the pyruvate dehydrogenase complex. This protein tethers E3 dimers to the E2 core of the PDH complex. Defects in this gene are a cause of pyruvate dehydrogenase deficiency which results in neurological dysfunction and lactic acidosis in infancy and early childhood. This protein is also a minor antigen for antimitochondrial antibodies. These autoantibodies are present in nearly 95% of patients with the autoimmune liver disease primary biliary cirrhosis (PBC). In PBC, activated T lymphocytes attack and destroy epithelial cells in the bile duct where this protein is abnormally distributed and overexpressed. PBC eventually leads to cirrhosis and liver failure. Alternative splicing results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, Oct 2009]

Description

Pyruvate dehydrogenase complex component X

Tissue specificity

Tissue enhanced (skeletal muscle, tongue)

Subcell location

Nucleoplasm, Plasma membrane, Mitochondria

Predicted location

Intracellular

Protein family

Disease related genes
Human disease related genes
Mapped to neXtProt
Mapped to UniProt SWISS-PROT
Metabolic proteins
Plasma proteins
Predicted intracellular proteins
Protein evidence (Ezkurdia et al 2014)
Protein evidence (Kim et al 2014)

Chromosome

11 (34915829 - 35020591)

Ensembl ID

ENSG00000110435  (ver. 103.38)

Orthologs

Mouse Pdhx: ENSMUSG00000010914

UniProt

O00330

neXtProt

NX_O00330

Human splice variants
Mouse splice variants

Protein structure