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Protein & Peptide Letters

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Letter Article

Conformational Dynamics Analysis of MEK1 Using Hydrogen/Deuterium Exchange Mass Spectrometry

Author(s): Min Woo Yun, Kiae Kim, Ji Young Park and Ka Young Chung*

Volume 28, Issue 5, 2021

Published on: 03 November, 2020

Page: [481 - 488] Pages: 8

DOI: 10.2174/0929866527666201103152534

Price: $65

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Abstract

Background: Activation of mitogen-activated protein kinases (MAPKs) is regulated by a phosphorylation cascade comprising three kinases, MAPK kinase kinase (MAP3K), MAPK kinase (MAP2K), and MAPK. MAP2K1 and MAPK2K2, also known as MEK1 and MEK2, activate ERK1 and ERK2. The structure of the MAPK signaling cascade has been studied, but high-resolution structural studies of MAP2Ks have often focused on kinase domains or docking sites, but not on full-length proteins.

Objective: To understand the conformational dynamics of MEK1.

Methods: Full-length MEK1 was purified from Escherichia coli (BL21), and its conformational dynamics were analyzed using hydrogen/deuterium exchange mass spectrometry (HDX-MS). The effects of ATP binding were examined by co-incubating MEK1 and adenylyl-imidodiphosphate (AMP- PNP), a non-hydrolysable ATP analog.

Results: MEK1 exhibited mixed EX1/EX2 HDX kinetics within the N-terminal tail through β1, αI, and the C-terminal helix. AMP-PNP binding was found to reduce conformational dynamics within the glycine-rich loop and regions near the DFG motif, along with the activation lip.

Conclusion: We report for the first time that MEK1 has regions that slowly change its folded and unfolded states (mixed EX1/EX2 kinetics) and also report the conformational effects of ATP-binding to MEK1.

Keywords: MAPK pathway, MEK1, conformational dynamics, HDX-MS, EX1, ATP.

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