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NameThromboxane A2 receptor
Synonyms
  • Prostanoid TP receptor
  • TXA2-R
Gene NameTBXA2R
OrganismHuman
Amino acid sequence
>lcl|BSEQ0037068|Thromboxane A2 receptor
MWPNGSSLGPCFRPTNITLEERRLIASPWFAASFCVVGLASNLLALSVLAGARQGGSHTR
SSFLTFLCGLVLTDFLGLLVTGTIVVSQHAALFEWHAVDPGCRLCRFMGVVMIFFGLSPL
LLGAAMASERYLGITRPFSRPAVASQRRAWATVGLVWAAALALGLLPLLGVGRYTVQYPG
SWCFLTLGAESGDVAFGLLFSMLGGLSVGLSFLLNTVSVATLCHVYHGQEAAQQRPRDSE
VEMMAQLLGIMVVASVCWLPLLVFIAQTVLRNPPAMSPAGQLSRTTEKELLIYLRVATWN
QILDPWVYILFRRAVLRRLQPRLSTRPRSLSLQPQLTQRSGLQ
Number of residues343
Molecular Weight37430.69
Theoretical pI10.31
GO Classification
Functions
  • thromboxane A2 receptor activity
  • guanyl-nucleotide exchange factor activity
Processes
  • positive regulation of GTPase activity
  • positive regulation of vasoconstriction
  • positive regulation of angiogenesis
  • response to nutrient
  • positive regulation of blood pressure
  • blood coagulation
  • response to drug
  • second-messenger-mediated signaling
  • inflammatory response
  • thromboxane A2 signaling pathway
  • platelet activation
  • positive regulation of cytosolic calcium ion concentration
  • G-protein coupled receptor signaling pathway
  • positive regulation of smooth muscle contraction
  • response to lipopolysaccharide
Components
  • acrosomal vesicle
  • plasma membrane
  • cytosol
  • integral component of plasma membrane
General FunctionThromboxane a2 receptor activity
Specific FunctionReceptor for thromboxane A2 (TXA2), a potent stimulator of platelet aggregation. The activity of this receptor is mediated by a G-protein that activates a phosphatidylinositol-calcium second messenger system. In the kidney, the binding of TXA2 to glomerular TP receptors causes intense vasoconstriction. Activates phospholipase C. Isoform 1 activates adenylyl cyclase. Isoform 2 inhibits adenylyl cyclase.
Pfam Domain Function
Transmembrane Regions30-52 67-87 107-128 150-172 194-219 247-270 290-311
GenBank Protein ID533326
UniProtKB IDP21731
UniProtKB Entry NameTA2R_HUMAN
Cellular LocationCell membrane
Gene sequence
>lcl|BSEQ0019006|Thromboxane A2 receptor (TBXA2R)
ATGTGGCCCAACGGCAGTTCCCTGGGGCCCTGTTTCCGGCCCACAAACATTACCCTGGAG
GAGAGACGGCTGATCGCCTCGCCCTGGTTCGCCGCCTCCTTCTGCGTGGTGGGCCTGGCC
TCCAACCTGCTGGCCCTGAGCGTGCTGGCGGGCGCGCGGCAGGGGGGTTCGCACACGCGC
TCCTCCTTCCTCACCTTCCTCTGCGGCCTCGTCCTCACCGACTTCCTGGGGCTGCTGGTG
ACCGGTACCATCGTGGTGTCCCAGCACGCCGCGCTCTTCGAGTGGCACGCCGTGGACCCT
GGCTGCCGTCTCTGTCGCTTCATGGGCGTCGTCATGATCTTCTTCGGCCTGTCCCCGCTG
CTGCTGGGGGCCGCCATGGCCTCAGAGCGCTACCTGGGTATCACCCGGCCCTTCTCGCGC
CCGGCGGTCGCCTCGCAGCGCCGCGCCTGGGCCACCGTGGGGCTGGTGTGGGCGGCCGCG
CTGGCGCTGGGCCTGCTGCCCCTGCTGGGCGTGGGTCGCTACACCGTGCAATACCCGGGG
TCCTGGTGCTTCCTGACGCTGGGCGCCGAGTCCGGGGACGTGGCCTTCGGGCTGCTCTTC
TCCATGCTGGGCGGCCTCTCGGTCGGGCTGTCCTTCCTGCTGAACACGGTCAGCGTGGCC
ACCCTGTGCCACGTCTACCACGGGCAGGAGGCGGCCCAGCAGCGTCCCCGGGACTCCGAG
GTGGAGATGATGGCTCAGCTCCTGGGGATCATGGTGGTGGCCAGCGTGTGTTGGCTGCCC
CTTCTGGTCTTCATCGCCCAGACAGTGCTGCGAAACCCGCCTGCCATGAGCCCCGCCGGG
CAGCTGTCCCGCACCACGGAGAAGGAGCTGCTCATCTACTTGCGCGTGGCCACCTGGAAC
CAGATCCTGGACCCCTGGGTGTATATCCTGTTCCGCCGCGCCGTGCTCCGGCGTCTCCAG
CCTCGCCTCAGCACCCGGCCCAGGTCGCTGTCCCTCCAGCCCCAGCTCACGCAGCGCTCC
GGGCTGCAGTAG
GenBank Gene IDD38081
GeneCard IDNot Available
GenAtlas IDTBXA2R
HGNC IDHGNC:11608
Chromosome Location19
Locus19p13.3
References
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  2. Nusing RM, Hirata M, Kakizuka A, Eki T, Ozawa K, Narumiya S: Characterization and chromosomal mapping of the human thromboxane A2 receptor gene. J Biol Chem. 1993 Nov 25;268(33):25253-9. 8227091
  3. Raychowdhury MK, Yukawa M, Collins LJ, McGrail SH, Kent KC, Ware JA: Alternative splicing produces a divergent cytoplasmic tail in the human endothelial thromboxane A2 receptor. J Biol Chem. 1994 Jul 29;269(30):19256-61. 8034687
  4. Raychowdhury MK, Yukawa M, Collins LJ, McGrail SH, Kent KC, Ware JA: Alternative splicing produces a divergent cytoplasmic tail in the human endothelial thromboxane A2 receptor. J Biol Chem. 1995 Mar 24;270(12):7011. 7896853
  5. D'Angelo DD, Davis MG, Ali S, Dorn GW 2nd: Cloning and pharmacologic characterization of a thromboxane A2 receptor from K562 (human chronic myelogenous leukemia) cells. J Pharmacol Exp Ther. 1994 Nov;271(2):1034-41. 7965765
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  8. Hirata T, Ushikubi F, Kakizuka A, Okuma M, Narumiya S: Two thromboxane A2 receptor isoforms in human platelets. Opposite coupling to adenylyl cyclase with different sensitivity to Arg60 to Leu mutation. J Clin Invest. 1996 Feb 15;97(4):949-56. 8613548
  9. Funk CD, Furci L, Moran N, Fitzgerald GA: Point mutation in the seventh hydrophobic domain of the human thromboxane A2 receptor allows discrimination between agonist and antagonist binding sites. Mol Pharmacol. 1993 Nov;44(5):934-9. 8246916
  10. Sasaki M, Sukegawa J, Miyosawa K, Yanagisawa T, Ohkubo S, Nakahata N: Low expression of cell-surface thromboxane A2 receptor beta-isoform through the negative regulation of its membrane traffic by proteasomes. Prostaglandins Other Lipid Mediat. 2007 Jun;83(4):237-49. Epub 2006 Dec 27. 17499743
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