A novel photoactivatable cross-linker for the functionally-directed region-specific fluorescent labeling of proteins.
A novel photoactivatable cross-linker for the functionally-directed region-specific fluorescent labeling of proteins.
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一种新型光活化交联剂,用于蛋白质功能定向区域特异性荧光标记。
DOI:
10.1111/j.1432-1033.1992.tb16949.x
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发表时间:
1992
期刊:
影响因子:
--
通讯作者:
Shohet,SB
中科院分区:
文献类型:
--
作者:
Thevenin,BJ;Shahrokh,Z;Williard,RL;Fujimoto,EK;Kang,JJ;Ikemoto,N;Shohet,SB
A cleavable cross‐linking reagent, sulfosuccinimidyl‐2(7‐azido‐4‐methycoumarin‐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 terminalN‐sulfoscuccinimidyl ester for conjugation to the donor, a terminal photoactivatable azido‐coumarin species for cross‐linking with the interacting target, and a central disculfide spacer for the release of the labeled target after cleavage. To evaluate the effectiveness of this labeling reagent, soynean trypsin inhibitor (STI) was derivatized (∼ 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 refuctive 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 specificty 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 (≤1.8nm) 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.
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影响因子:
4.8
作者:
M. Schwartz;O. Das;R. Hynes
通讯作者:
R. Hynes
DOI:
--
发表时间:
1979
期刊:
Biochimica et Biophysica Acta
影响因子:
--
作者:
T. Ji
通讯作者:
T. Ji
DOI:
10.1016/s0021-9258(19)75251-x
发表时间:
1977
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
D. Kiehm;T. Ji
通讯作者:
T. Ji
DOI:
10.1016/s0021-9258(18)67620-3
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
P. Sorensen;N. Farber;G. Krystal
通讯作者:
G. Krystal
DOI:
10.1016/s0021-9258(19)63381-8
发表时间:
1977
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
C. H. Huang;F. Richards
通讯作者:
F. Richards