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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Probing the Lysine Proximal Microenvironments within Membrane Protein Complexes by Active Dimethyl Labeling and Mass Spectrometry.
Analytical Chemistry 2016 December 21
Positively charged lysines are crucial to maintaining the native structures of proteins and protein complexes by forming hydrogen bonds and electrostatic interactions with their proximal amino acid residues. However, it is still a challenge to develop an efficient method for probing the active proximal microenvironments of lysines without changing their biochemical/physical properties. Herein, we developed an active covalent labeling strategy combined with mass spectrometry to systematically probe the lysine proximal microenvironments within membrane protein complexes (∼700 kDa) with high throughput. Our labeling strategy has the advantages of high labeling efficiency and stability, preservation of the active charge states, as well as biological activity of the labeled proteins. In total, 121 lysines with different labeling levels were obtained for the photosystem II complexes from cyanobacteria, red algae, and spinach and provided important insights for understanding the conserved and nonconserved local structures of PSII complexes among evolutionarily divergent species that perform photosynthesis.
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