Metalloprotein entatic control of ligand-metal bonds quantified by ultrafast x-ray spectroscopy.

Metalloprotein entatic control of ligand-metal bonds quantified by ultrafast x-ray spectroscopy.
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DOI:
10.1126/science.aam6203
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发表时间:
2017-06-23
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Solomon EI
Solomon EI
中科院分区:
其他
文献类型:
--
作者:
Mara MW;Hadt RG;Reinhard ME;Kroll T;Lim H;Hartsock RW;Alonso-Mori R;Chollet M;Glownia JM;Nelson S;Sokaras D;Kunnus K;Hodgson KO;Hedman B;Bergmann U;Gaffney KJ;Solomon EI

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The multifunctional protein cytochrome c (cyt c) plays key roles in electron transport and apoptosis, switching function by modulating bonding between a heme iron and the sulfur in a methionine residue. This Fe–S(Met) bond is too weak to persist in the absence of protein constraints. We ruptured the bond in ferrous cyt c using an optical laser pulse and monitored the bond reformation within the protein active site using ultrafast x-ray pulses from an x-ray free-electron laser, determining that the Fe–S(Met) bond enthalpy is ~4 kcal/mol stronger than in the absence of protein constraints. The 4 kcal/mol is comparable with calculations of stabilization effects in other systems, demonstrating how biological systems use an entatic state for modest yet accessible energetics to modulate chemical function.
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