A novel photoaffinity probe for the leukotriene D-4 receptor (LTD4) is described. L-745310, which is structurally related to the potent LTD4 antagonist MK-0476 (Singulair(TM)), was found to selectively label a 43-kDa protein in guinea-pig lung membrane previously identified as the LTD4 receptor. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
A novel photoaffinity probe for the leukotriene D-4 receptor (LTD4) is described. L-745310, which is structurally related to the potent LTD4 antagonist MK-0476 (Singulair(TM)), was found to selectively label a 43-kDa protein in guinea-pig lung membrane previously identified as the LTD4 receptor. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
Novel bifunctional probe for radioisotope-free photoaffinity labeling: compact structure comprised of photospecific ligand ligation and detectable tag anchoring unitsElectronic supplementary information (ESI) available: Photo-decomposition study of phenyl and benzyl azides. Experimental details for photoreactions of 1 and 5. Synthetic procedures and characterization of new compounds. See http://www.rsc.org/suppdata/ob/b3/b316221d/.
A novel method for radioisotope-free photoaffinitylabeling was developed, in which a bifunctional ligand is connected to a target protein by activation of a photoreactive group, such as an aromatic azido or 3-trifluoromethyl-3H-diazirin-3-yl group, and identification of the ligated product is achieved by anchoring of a detectable tag through the Staudinger-Bertozzi reaction with an alkyl azido moiety
Amides of (2Z,4E)-5-[(5,6-dichloroindol-2-yl)]-2-methoxy-N-[3-[4-[3-(carboxymethoxy)phenyl)] piperazin-1-yl]propyl]-2,4-pentadienamide (1) and of 5-(5,6-dichloro-2-indolyl)-2-methoxy-2,4-pentadienoic acid (2) are strong inhibitors of the vacuolar ATPase located on the plasma membrane of osteoclasts. In order to understand which V-ATPase subunit is involved in the interaction with these novel inhibitors, analogues containing a photoactivable group and an iodine atom were designed. A series of alcohols or amines containing the photoactivable trifluoroaziridinophenyl or benzophenone moiety and an iodine atom were linked to the above acids via an ester or amide group. These compounds could be thereafter used as a radioactive photoprobe to label the protein. Whereas the compounds containing the photoactivable groups maintained good inhibitory activity, the introduction of the bulky iodine atom was generally detrimental, decreasing potency significantly. Better results were obtained by linking. 3-(4-amino-piperidinomethyl)-3'-iodobenzophenone to 3-ethoxy-4-(2-(5,6-dichlorobenzimidazolyl))benzoic acid to give the corresponding amide 27, that inhibited vacuolar ATP-ase with a IC50 = 140 nM. The feasibility of introducing a radioactive 1211 atom,was ascertained by exchanging the iodine with a tributylstannyl group, that was again substituted by iodine. (C) 2003 Elsevier Science Ltd. All rights reserved.