Identification of the titrating group in the heme cavity of myoglobin. Evidence for the heme-protein pi-pi interaction.
Identification of the titrating group in the heme cavity of myoglobin. Evidence for the heme-protein pi-pi interaction.
复制标题
肌红蛋白血红素腔中滴定基团的识别。
DOI:
10.1111/j.1432-1033.1984.tb07892.x
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发表时间:
1984
期刊:
影响因子:
--
通讯作者:
LaMar,GN
中科院分区:
文献类型:
--
作者:
Krishnamoorthi,R;LaMar,GN
The pH dependence of the proton NMR chemical shifts of met‐cyano and deoxy forms of native and reconstituted myoglobins reflects a structural transition in the heme pocket modulated by a single proton with pK5.1–5.6. Comparison of this pH dependence of sperm whale and elephant myoglobin and that of the former protein reconstituted with esterified hemin eliminates both the distal histidine as well as the heme propionates as the titrating residue. Reconstitution of sperm whale met‐cyano myoglobin with hemin modified at the 2,4‐positions leads to a systematic variation in the pKfor the structural transition, thus indicating the presence of a coupling between the titrating group and the heme π system. The results are consistent with histidine FG3 (His‐FG3) being the titrating group, and a donor‐acceptor π‐π interaction between its imidazole and the heme is proposed.
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