Conversion of the reactive sulfhydryl groups of proteins to the S-trifluoroethyl derivatives. Application to human hemoglobin.
Conversion of the reactive sulfhydryl groups of proteins to the S-trifluoroethyl derivatives. Application to human hemoglobin.
复制标题
将蛋白质的反应性巯基转化为 S-三氟乙基衍生物。
DOI:
10.1016/0003-2697(81)90105-6
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发表时间:
1981
影响因子:
2.9
通讯作者:
Knowles,FC
中科院分区:
文献类型:
--
作者:
Knowles,FC
The S-2,2,2-trifluoroethyl residue (-SCH2CF3) has been incorporated into human hemoglobin, Hb4(SH)2, as an extrinsic probe at Cys-β93 through formation of a disulfide bond. The thiol group was activated by reaction with 5,5′-dithiobis(2-nitrobenzoic acid), Hb4(SSCH2CF3)2then being obtained by reaction with 2,2,2-trifluoroethanethiol. Both disulfide interchange reactions proceed to completion with a modest excess of reagents using dilute solutions of hemoglobin (0.005 m heme). The stoichiometry of each disulfide interchange reaction is readily determined by measurement of 5-thio-2-nitrobenzoic acid, a product of each reaction. The functional properties of Hb4(SSCH2CF3)2were found to be similar to those of Hb4(SH)2. At pH 7.0 and 20°C the partial pressure of oxygen required for half saturation was 0.45 mm Hg in 0.050 m 2,2-bis(hydroxymethyl)-2,2′,2″-nitrilo-triethanol, 4.1 mm Hg in 0.050 m potassium phosphate, and 16.5 mm Hg in 0.010 m inositol hexaphosphate. The n values of the Hill plots were 1.45, 1.80, and 2.3, respectively. The equilibrium constant for the tetramer-dimer dissociation reaction, K4,2, of the carbon monoxide derivative was 2.1 × 10−7m. The time course for combination with carbon monoxide was homogeneous at 432 nm. In the presence of inositol hexaphosphate the time course of combination with carbon monoxide was wavelength dependent.
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DOI:
10.1016/s0021-9258(18)99366-x
发表时间:
1967
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
L. Parkhurst;Q. Gibson
通讯作者:
Q. Gibson
DOI:
10.1016/s0006-291x(75)80350-0
发表时间:
1975
影响因子:
3.1
作者:
F. Knowles
通讯作者:
F. Knowles
影响因子:
2.9
作者:
D. J. Smith;E. Maggio;G. L. Kenyon
通讯作者:
G. L. Kenyon
影响因子:
4.8
作者:
S. Edelstein;M. J. Rehmar;J. Olson;Q. Gibson
通讯作者:
Q. Gibson
DOI:
10.1016/s0021-9258(19)44294-4
发表时间:
1973
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Q. Gibson
通讯作者:
Q. Gibson