title: Hydrodynamic properties of a thromboxane A2/prostaglandin H2 antagonist binding site solubilized from human platelets.
abstract: The hydrodynamic properties of a binding site for the thromboxane A2/prostaglandin H2 receptor antagonist 9,11-dimethylmethano-11, 12-methano-16-(3-iodo-4-hydroxyphenyl)-13, 14-dihydro-13-aza-15 alpha beta-omega-tetranor-thromboxane A2 (I-PTA-OH) were determined in solubilized membrane proteins from human platelets using the detergent 3-[(3-cholamidopropyl)-dimethylammonio] 1-propane-sulfonate (CHAPS). Gel filtration revealed a Stokes radius of 5.25 +/- 0.37 nm (n=9). Molecular weight determined by gel filtration assuming a spherical protein was 180,000-220,000 Daltons. Sedimentation through sucrose or glycerol gradients revealed a sedimentation coefficient of 6.3 +/- 0.2 Svedberg units (n=5). The molecular weight calculated using the Stokes radius and sedimentation coefficient was 140,000 Daltons. The frictional ratio f/fo was 1.4, corresponding to an axial ratio of 7:1.
mesh_terms: D001665:Binding Sites; D001792:Blood Platelets / Q000032:analysis*; D002850:Chromatography, Gel; D006801:Humans; D008970:Molecular Weight; D011449:Prostaglandin Endoperoxides / Q000037:antagonists & inhibitors*; D011450:Prostaglandin Endoperoxides, Synthetic / Q000037:antagonists & inhibitors*; D044262:Prostaglandin H2; D011463:Prostaglandins H / Q000037:antagonists & inhibitors*; D011956:Receptors, Cell Surface / Q000302:isolation & purification*; D011982:Receptors, Prostaglandin / Q000302:isolation & purification*; D012995:Solubility; D013928:Thromboxane A2 / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors* / Q000378:metabolism
chemical_list: D011449:Prostaglandin Endoperoxides; D011450:Prostaglandin Endoperoxides, Synthetic; D011463:Prostaglandins H; D011956:Receptors, Cell Surface; D011982:Receptors, Prostaglandin; D044262:Prostaglandin H2; D013928:Thromboxane A2; C046957:I-PTA-OH