Defective TBXAS1 does not isomerise PGH2 to TXA2

Stable Identifier
R-HSA-5603275
Type
Reaction [transition]
Species
Homo sapiens
Compartment
endoplasmic reticulum membrane, endoplasmic reticulum lumen
ReviewStatus
5/5
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Defective TBXAS1 does not isomerise PGH2 to TXA2
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Thromboxane-A synthase (TBXAS1), an enzyme of the arachidonic acid cascade, produces thromboxane A2 (TXA2) from prostaglandin H2 (PGH2). Together with prostacyclin (PGI2), TXA2 plays a key role in the maintenance of haemostasis. It is also a constrictor of vascular and respiratory smooth muscle and implicated in the induction of osteoclast differentiation and activation. Defects in TBXAS1 can cause Ghosal hematodiaphyseal dysplasia (GHDD; MIM:231095), a rare autosomal recessive disorder characterised by increased bone density with predominant diaphyseal involvement and aregenerative anemia, a bone marrow failure where functional marrow cells are regenerated slowly or not at all. Mutations that can cause GHDD are L488P, L83P, G482W and R413E (Genevieve et al. 2008).
Literature References
PubMed ID Title Journal Year
18264100 Thromboxane synthase mutations in an increased bone density disorder (Ghosal syndrome)

Munnich, A, Isidor, B, Serre, V, Bellais, S, Dreyfus, M, de Vernejoul, MC, Bader-Meunier, B, Vignon-Savoye, C, Le Merrer, M, Gaussem, P, Fischer, AM, Blanche, S, Picard, C, Djouadi, F, Proulle, V, Legeai-Mallet, L, Cormier-Daire, V, Geneviève, D

Nat. Genet. 2008
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Catalyst Activity

thromboxane-A synthase activity of TBXAS1 mutants [endoplasmic reticulum membrane]

Physical Entity
TBXAS1 mutants [endoplasmic reticulum membrane] (Homo sapiens)
Activity
thromboxane-A synthase activity (GO:0004796)
Normal reaction
TBXAS1 isomerises PGH2 to TXA2 (Homo sapiens)
Functional status

Loss of function of TBXAS1 mutants [endoplasmic reticulum membrane]

Normal Entity
Disease Entity
Status
Disease
Authored
Jassal, B  (2014-07-01)
Reviewed
Nakaki, T  (2014-11-03)
Created
Jassal, B  (2014-07-01)
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