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pubmed-article:1597185pubmed:abstractTextA cleavable cross-linking reagent, sulfosuccinimidyl-2(7-azido-4-methylcoumarin-3-acetamido)-ethyl-1,3'- dithiopropionate (SAED), was synthesized for the selective transfer of a coumarin fluorophore from a 'donor' protein to a position near the binding site of an interacting 'target' protein. SAED contains a terminal N-sulfosuccinimidyl ester for conjugation to the donor, a terminal photoactivatable azido-coumarin species for cross-linking with the interacting target, and a central disulfide spacer for the release of the labeled target after cleavage. To evaluate the effectiveness of this labeling reagent, soybean trypsin inhibitor (STI) was derivatized (approximately 0.5 mol/mol) with SAED and then photolyzed in the presence of trypsin. A single fluorescent cross-linked species (6-7 mol% of total STI) was observed by SDS/PAGE and, after reductive cleavage, was shown to be a 1:1 STI-trypsin complex. This complex was not detected without photolysis or with an inactivated cross-linker. Importantly, complex formation was inhibited by an excess of unmodified STI and prevented by substitution of a non-interacting protein for trypsin. Cleavage of the cross-linked complex revealed that the trypsin, but not the STI, was fluorescent; the uncomplexed trypsin fraction remained unlabeled. These results demonstrated the specificity of the labeling of trypsin by fluorescent-transfer cross-linking with SAED. An efficiency of about 15% for this cross-linking mediated labeling of trypsin was calculated. The short cross-linking span of SAED (less than or equal to 1.8 nm) strictly limited the labeling to the vicinity of the contact region of trypsin with STI. Thus, this novel cross-linker permits the region-specific targeting of a fluorophore near a functionally important binding site.lld:pubmed
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pubmed-article:1597185pubmed:authorpubmed-author:ShohetS BSBlld:pubmed
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pubmed-article:1597185pubmed:year1992lld:pubmed
pubmed-article:1597185pubmed:articleTitleA novel photoactivatable cross-linker for the functionally-directed region-specific fluorescent labeling of proteins.lld:pubmed
pubmed-article:1597185pubmed:affiliationDepartment of Medicine, University of California, San Francisco 94143.lld:pubmed
pubmed-article:1597185pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:1597185pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:1597185pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed