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

Journal Article · · Science

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. As a result, 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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
award301025; AC02-76SF00515; award290961; P41GM103393; award306971; R01GM040392
OSTI ID:
1437194
Alternate ID(s):
OSTI ID: 1369315
Journal Information:
Science, Journal Name: Science Vol. 356 Journal Issue: 6344; ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 89 works
Citation information provided by
Web of Science

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Influence of Functionalized Substituents on the Electron-Transfer Abilities of Copper Guanidinoquinoline Complexes: Influence of Functionalized Substituents on the Electron-Transfer Abilities of Copper Guanidinoquinoline Complexes journal November 2018
Relating the multi-functionality of cytochrome c to membrane binding and structural conversion journal March 2018
MOMP, cell suicide as a BCL-2 family business journal October 2017
Transferring the entatic-state principle to copper photochemistry journal January 2018
Vibrational wavepacket dynamics in Fe carbene photosensitizer determined with femtosecond X-ray emission and scattering journal January 2020
The plasticity of redox cofactors: from metalloenzymes to redox-active DNA journal August 2018
Catalytic properties of the metal ion variants of mandelate racemase reveal alterations in the apparent electrophilicity of the metal cofactor journal January 2019
Resolving structures of transition metal complex reaction intermediates with femtosecond EXAFS journal January 2020
X-ray snapshots reveal conformational influence on active site ligation during metalloprotein folding journal January 2019
Perspective: Opportunities for ultrafast science at SwissFEL journal November 2017
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Sizing up a supercharged ferryl journal April 2018
Chemical interactions and dynamics with femtosecond X-ray spectroscopy and the role of X-ray free-electron lasers journal April 2019
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