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Native top-down mass spectrometry provides insights into the copper centers of membrane-bound methane monooxygenase.

Abstract：

:Aerobic methane oxidation is catalyzed by particulate methane monooxygenase (pMMO), a copper-dependent, membrane metalloenzyme composed of subunits PmoA, PmoB, and PmoC. Characterization of the copper active site has been limited by challenges in spectroscopic analysis stemming from the presence of multiple copper binding sites, effects of detergent solubilization on activity and crystal structures, and the lack of a heterologous expression system. Here we utilize nanodiscs coupled with native top-down mass spectrometry (nTDMS) to determine the copper stoichiometry in each pMMO subunit and to detect post-translational modifications (PTMs). These results indicate the presence of a mononuclear copper center in both PmoB and PmoC. pMMO-nanodisc complexes with a higher stoichiometry of copper-bound PmoC exhibit increased activity, suggesting that the PmoC copper site plays a role in methane oxidation activity. These results provide key insights into the pMMO copper centers and demonstrate the ability of nTDMS to characterize complex membrane-bound metalloenzymes.

journal_name

Nat Commun

journal_title

Nature communications

authors

Ro SY,Schachner LF,Koo CW,Purohit R,Remis JP,Kenney GE,Liauw BW,Thomas PM,Patrie SM,Kelleher NL,Rosenzweig AC

doi

10.1038/s41467-019-10590-6

subject

Has Abstract

pub_date

2019-06-17 00:00:00

pages

2675

issue

1

issn

2041-1723

pii

10.1038/s41467-019-10590-6

journal_volume

10

pub_type

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