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Title: The energy landscape of adenylate kinase during catalysis

Journal Article · · Nature Structural & Molecular Biology
DOI:https://doi.org/10.1038/nsmb.2941· OSTI ID:1182309
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  1. Brandeis Univ., Waltham, MA (United States). Dept. of Biochemistry. Howard Hughes Medical Inst.
  2. Univ. of California, Berkeley, CA (United States)
  3. Brandeis Univ., Waltham, MA (United States). Dept. of Physics

Kinases perform phosphoryl-transfer reactions in milliseconds; without enzymes, these reactions would take about 8,000 years under physiological conditions. Despite extensive studies, a comprehensive understanding of kinase energy landscapes, including both chemical and conformational steps, is lacking. In this paper, we scrutinize the microscopic steps in the catalytic cycle of adenylate kinase, through a combination of NMR measurements during catalysis, pre-steady-state kinetics, molecular-dynamics simulations and crystallography of active complexes. We find that the Mg2+ cofactor activates two distinct molecular events: phosphoryl transfer (>105-fold) and lid opening (103-fold). In contrast, mutation of an essential active site arginine decelerates phosphoryl transfer 103-fold without substantially affecting lid opening. Finally, our results highlight the importance of the entire energy landscape in catalysis and suggest that adenylate kinases have evolved to activate key processes simultaneously by precise placement of a single, charged and very abundant cofactor in a preorganized active site.

Research Organization:
Brandeis Univ., Waltham, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Inst. of Health (NIH) (United States); Damon Runyon Cancer Research Foundation (United States)
Contributing Organization:
Univ. of California, Berkeley, CA (United States)
Grant/Contract Number:
FG02-05ER15699; RO1-GM100966; DRG-2114-12
OSTI ID:
1182309
Journal Information:
Nature Structural & Molecular Biology, Vol. 22, Issue 2; ISSN 1545-9993
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 110 works
Citation information provided by
Web of Science

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Probing the transition state in enzyme catalysis by high-pressure NMR dynamics journal June 2019
Origin of conformational dynamics in a globular protein journal November 2019
The mechanism of PI3Kα activation at the atomic level journal January 2019
Strain analysis of protein structures and low dimensionality of mechanical allosteric couplings journal September 2016
Molecular mechanism of ATP versus GTP selectivity of adenylate kinase journal March 2018
The properties of buried ion pairs are governed by the propensity of proteins to reorganize posted_content February 2020
Functional cross-talk between allosteric effects of activating and inhibiting ligands underlies PKM2 regulation posted_content July 2018
Integrated evolutionary and structural analysis reveals xenobiotics and pathogens as the major drivers of mammalian adaptation posted_content September 2019
Unsupervised Graph-Based Learning Predicts Mutations That Alter Protein Dynamics posted_content November 2019
Protein dynamics and function from solution state NMR spectroscopy journal January 2016
GPCR drug discovery: integrating solution NMR data with crystal and cryo-EM structures journal November 2018
Dynamic allostery can drive cold adaptation in enzymes journal June 2018
Family permutation profiling identifies a dynamic protein domain as functionally tolerant to increased conformational entropy posted_content November 2019
Role of substrate-product frustration on enzyme functional dynamics journal November 2019
Overcoming the Bottleneck of the Enzymatic Cycle by Steric Frustration journal June 2019
Functional cross-talk between allosteric effects of activating and inhibiting ligands underlies PKM2 regulation. text January 2020
The Mechanism of PI3Kα Activation at the Atomic Level journal February 2019
Functional cross-talk between allosteric effects of activating and inhibiting ligands underlies PKM2 regulation. text January 2020
Functional cross-talk between allosteric effects of activating and inhibiting ligands underlies PKM2 regulation journal July 2019
Hidden Conformational States and Strange Temperature Optima in Enzyme Catalysis journal September 2020
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