Ion Mobility Mass Spectrometry of Two Tetrameric Membrane Protein Complexes Reveals Compact Structures and Differences in Stability and Packing

2010 ◽  
Vol 132 (44) ◽  
pp. 15468-15470 ◽  
Author(s):  
Sheila C. Wang ◽  
Argyris Politis ◽  
Natalie Di Bartolo ◽  
Vassiliy N. Bavro ◽  
Stephen J. Tucker ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Membrane Protein ◽  
Ion Mobility ◽  
Protein Complexes ◽  
Ion Mobility Mass Spectrometry ◽  
Membrane Protein Complexes

scholarly journals Surface induced dissociation as a tool to study membrane protein complexes

2017 ◽  
Vol 53 (21) ◽  
pp. 3106-3109 ◽  
Author(s):  
Sophie R. Harvey ◽  
Yang Liu ◽  
Wen Liu ◽  
Vicki H. Wysocki ◽  
Arthur Laganowsky
Keyword(s):  
Mass Spectrometry ◽  
Membrane Protein ◽  
Ion Mobility ◽  
Protein Complexes ◽  
Integral Membrane Protein ◽  
Ion Mobility Mass Spectrometry ◽  
Surface Induced Dissociation ◽  
Membrane Protein Complexes

Native ion mobility mass spectrometry (MS) and surface induced dissociation (SID) are applied to study the integral membrane protein complexes AmtB and AqpZ.

scholarly journals Mass spectrometry of intact membrane protein complexes

2013 ◽  
Vol 8 (4) ◽  
pp. 639-651 ◽  
Author(s):  
Arthur Laganowsky ◽  
Eamonn Reading ◽  
Jonathan T S Hopper ◽  
Carol V Robinson
Keyword(s):  
Mass Spectrometry ◽  
Membrane Protein ◽  
Protein Complexes ◽  
Intact Membrane ◽  
Membrane Protein Complexes

Ion Mobility–Mass Spectrometry Reveals Long-Lived, Unfolded Intermediates in the Dissociation of Protein Complexes

2007 ◽  
Vol 46 (42) ◽  
pp. 8001-8004 ◽  
Author(s):  
Brandon T. Ruotolo ◽  
Suk-Joon Hyung ◽  
Paula M. Robinson ◽  
Kevin Giles ◽  
Robert H. Bateman ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility ◽  
Protein Complexes ◽  
Ion Mobility Mass Spectrometry

scholarly journals Controlling release, unfolding and dissociation of membrane protein complexes in the gas phase through collisional cooling

2015 ◽  
Vol 51 (85) ◽  
pp. 15582-15584 ◽  
Author(s):  
Michael Landreh ◽  
Idlir Liko ◽  
Povilas Uzdavinys ◽  
Mathieu Coincon ◽  
Jonathan T. S. Hopper ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Membrane Protein ◽  
Gas Phase ◽  
Protein Complexes ◽  
Intact Membrane ◽  
Collisional Cooling ◽  
Membrane Protein Complexes ◽  
Detergent Micelles

Reduced collisional cooling releases intact membrane protein complexes from detergent micelles for unfolding and dissociation studies by mass spectrometry.

scholarly journals Native Tandem and Ion Mobility Mass Spectrometry Highlight Structural and Modular Similarities in Clustered-Regularly-Interspaced Shot-Palindromic-Repeats (CRISPR)-associated Protein Complexes From Escherichia coli and Pseudomonas aeruginosa

2012 ◽  
Vol 11 (11) ◽  
pp. 1430-1441 ◽  
Author(s):  
Esther van Duijn ◽  
Ioana M. Barbu ◽  
Arjan Barendregt ◽  
Matthijs M. Jore ◽  
Blake Wiedenheft ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mass Spectrometry ◽  
Ion Mobility ◽  
Protein Complexes ◽  
Acquired Resistance ◽  
Native Mass Spectrometry ◽  
Ion Mobility Mass Spectrometry ◽  
E Coli ◽  
Ribonucleoprotein Complexes ◽  
Specific Association

The CRISPR/Cas (clustered regularly interspaced short palindromic repeats/CRISPR-associated genes) immune system of bacteria and archaea provides acquired resistance against viruses and plasmids, by a strategy analogous to RNA-interference. Key components of the defense system are ribonucleoprotein complexes, the composition of which appears highly variable in different CRISPR/Cas subtypes. Previous studies combined mass spectrometry, electron microscopy, and small angle x-ray scattering to demonstrate that the E. coli Cascade complex (405 kDa) and the P. aeruginosa Csy-complex (350 kDa) are similar in that they share a central spiral-shaped hexameric structure, flanked by associating proteins and one CRISPR RNA. Recently, a cryo-electron microscopy structure of Cascade revealed that the CRISPR RNA molecule resides in a groove of the hexameric backbone. For both complexes we here describe the use of native mass spectrometry in combination with ion mobility mass spectrometry to assign a stable core surrounded by more loosely associated modules. Via computational modeling subcomplex structures were proposed that relate to the experimental IMMS data. Despite the absence of obvious sequence homology between several subunits, detailed analysis of sub-complexes strongly suggests analogy between subunits of the two complexes. Probing the specific association of E. coli Cascade/crRNA to its complementary DNA target reveals a conformational change. All together these findings provide relevant new information about the potential assembly process of the two CRISPR-associated complexes.

scholarly journals A Novel Chloroplast Super-Complex Consisting of the ATP Synthase and Photosystem I Reaction Center

2019 ◽  
Author(s):  
Satarupa Bhaduri ◽  
Sandeep K Singh ◽  
Whitaker Cohn ◽  
S. Saif Hasan ◽  
Julian P. Whitelegge ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Membrane Protein ◽  
Reaction Center ◽  
Atp Synthase ◽  
Photosystem I ◽  
Protein Complexes ◽  
Thylakoid Membranes ◽  
Native Page ◽  
Membrane Protein Complexes ◽  
Reaction Center Complexes

AbstractSeveral ‘super-complexes’ of individual hetero-oligomeric membrane protein complexes, whose function is to facilitate intra-membrane electron and proton transfer and harvesting of light energy, have been previously characterized in the mitochondrial cristae and chloroplast thylakoid membranes. The latter membrane is reported here to also be the location of an intra-membrane super-complex which is dominated by the ATP-synthase and photosystem I (PSI) reaction-center complexes, defined by mass spectrometry, clear-native PAGE and Western Blot analyses. This is the first documented presence of ATP synthase in a super-complex with the PSI reaction-center located in the non-appressed stromal domain of the thylakoid membrane.

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