HSD17B10 Recombinant Protein

This gene encodes 3-hydroxyacyl-CoA dehydrogenase type II, a member of the short-chain dehydrogenase/reductase superfamily. The gene product is a mitochondrial protein that catalyzes the oxidation of a wide variety of fatty acids, alcohols, and steroids. The protein has been implicated in the development of Alzheimer's disease, and mutations in the gene are the cause of 2-methyl-3-hydroxybutyryl-CoA dehydrogenase deficiency (MHBD). Several alternatively spliced transcript variants have been identified, but the full-length nature of only two transcript variants has been determined. [provided by RefSeq, Jul 2008]

Function: Functions in mitochondrial tRNA maturation. Part of mitochondrial ribonuclease P, an enzyme composed of MRPP1/TRMT10C, MRPP2/HSD17B10 and MRPP3/KIAA0391, which cleaves tRNA molecules in their 5'-ends. Catalyzes the beta-oxidation at position 17 of androgens and estrogens and has 3-alpha-hydroxysteroid dehydrogenase activity with androsterone. Catalyzes the third step in the beta-oxidation of fatty acids. Carries out oxidative conversions of 7-alpha-OH and 7-beta-OH bile acids. Also exhibits 20-beta-OH and 21-OH dehydrogenase activities with C21 steroids. By interacting with intracellular amyloid-beta, it may contribute to the neuronal dysfunction associated with Alzheimer disease (AD). Ref.1 Ref.10 Ref.13

Catalytic activity: (S)-3-hydroxyacyl-CoA + NAD+ = 3-oxoacyl-CoA + NADH. Ref.4 Ref.10(2S,3S)-3-hydroxy-2-methylbutanoyl-CoA + NAD+ = 2-methylacetoacetyl-CoA + NADH. Ref.4 Ref.10Testosterone + NAD(P)+ = androst-4-ene-3,17-dione + NAD(P)H. Ref.4 Ref.10

Subunit structure: Homotetramer

By similarity. Interacts with MRPP1/TRMT10C and MRPP3/KIAA0391. Ref.13

Subcellular location: Mitochondrion Ref.10 Ref.13.

Tissue specificity: Ubiquitously expressed in normal tissues but is overexpressed in neurons affected in AD. Ref.1

Involvement in disease: 2-methyl-3-hydroxybutyryl-CoA dehydrogenase deficiency (MHBD deficiency) [MIM:300438]: A disorder that leads to neurological abnormalities, including psychomotor retardation and, in virtually all patients, loss of mental and motor skills.Note: The disease is caused by mutations affecting the gene represented in this entry.Mental retardation, X-linked, syndromic, 10 (MRXS10) [MIM:300220]: A disorder characterized by significantly below average general intellectual functioning associated with impairments in adaptative behavior and manifested during the developmental period. MRXS10 patients manifest mild mental retardation, choreoathetosis and abnormal behavior.Note: The disease is caused by mutations affecting the gene represented in this entry. Ref.11Mental retardation, X-linked 17 (MRX17) [MIM:300705]: A disorder characterized by significantly below average general intellectual functioning associated with impairments in adaptative behavior and manifested during the developmental period. Intellectual deficiency is the only primary symptom of non-syndromic X-linked mental retardation, while syndromic mental retardation presents with associated physical, neurological and/or psychiatric manifestations.Note: The gene represented in this entry is involved in disease pathogenesis. A chromosomal microduplication involving HSD17B10 and HUWE1 has been found in patients with mental retardation. Ref.12

Sequence similarities: Belongs to the short-chain dehydrogenases/reductases (SDR) family.

Biophysicochemical propertiesKinetic parameters:KM=25.7 µM for acetoacetyl-CoA (in the presence of 0.2 mM NADH, at pH 7.0 and 25 degrees Celsius) Ref.10KM=85.2 µM for beta-hydroxybutyryl-CoA (in the presence of 1 mM NAD, at pH 9.3 and 25 degrees Celsius)KM=41 µM for androsterone (in the presence of 1 mM NAD, at pH 9.3 and 25 degrees Celsius)KM=5 µM for 5-alpha-pregnan-20-beta-ol-3-one (in the presence of 1 mM NAD, at pH 9.3 and 25 degrees Celsius)KM=219 µM for isoursodeoxycholic acid (in the presence of 1 mM NAD, at pH 9.3 and 25 degrees Celsius)KM=36.4 µM for chenodeoxycholic acid (in the presence of 1 mM NAD, at pH 9.3 and 25 degrees Celsius)KM=1.7 µM for dehydrocorticosterone (in the presence of 1 mM NAD, at pH 9.3 and 25 degrees Celsius)KM=30.6 µM for NADH (in the presence of acetoacetyl-CoA, at pH 7.0 and 25 degrees Celsius)KM=42.3 µM for NAD (in the presence of beta-hydroxybutyryl-CoA, at pH 9.3 and 25 degrees Celsius)pH dependence:Optimum pH is 9.3 for the dehydrogenase reaction at 25 degrees Celsius, and 7.0 for the reductase reaction at 25 degrees Celsius.