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.
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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
Knowles,FC
中科院分区:
生物学4区
文献类型:
--
作者:
Knowles,FC

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S-2,2,2-三氟乙基残基 (-SCH2CF3) 已通过形成二硫键作为 Cys-β93 的外在探针掺入人血红蛋白 Hb4(SH)2 中。与5,5'-二硫代双(2-硝基苯甲酸)反应活化硫醇基团,再与2,2,2-三氟乙硫醇反应得到Hb4(SSCH2CF3)2。两个二硫键交换反应均使用血红蛋白(0.005 m 血红素)的稀溶液,使用适度过量的试剂来完成。每个二硫化物交换反应的化学计量很容易通过测量每个反应的产物5-硫代-2-硝基苯甲酸来确定。发现 Hb4(SSCH2CF3)2 的功能特性与 Hb4(SH)2 相似。在 pH 7.0 和 20°C 下,半饱和所需的氧分压在 0.050 m 2,2-双(羟甲基)-2,2',2"-次氮基三乙醇中为 0.45 mm Hg,在 0.050 m 磷酸钾中为 4.1 mm Hg,在 0.010 m 肌醇六磷酸中为 16.5 mm Hg。希尔图的 n 值分别为 1.45、1.80 和 2.3。一氧化碳衍生物的四聚体-二聚体解离反应 K4,2 的平衡常数为 2.1 × 10−7m。与一氧化碳结合的时间过程在 432 nm 处是均匀的。在肌醇六磷酸存在下,与一氧化碳结合的时间过程取决于波长。
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.
一氧化碳与马血红蛋白在溶液、红细胞和晶体中的反应。
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
溴三氟丙酮修饰血红蛋白A的位点?
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
简单的烷硫醇基团用于暂时封闭酶的巯基。
DOI: 10.1021/bi00685a601
发表时间: 1975
期刊: Biochemistry
影响因子: 2.9
作者:
D. J. Smith;E. Maggio;G. L. Kenyon
通讯作者: G. L. Kenyon
DOI: --
发表时间: 1970
影响因子: 4.8
作者:
S. Edelstein;M. J. Rehmar;J. Olson;Q. Gibson
通讯作者: Q. Gibson
对汞苯甲酸盐作为血红蛋白构象变化的指示剂。
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