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Title: Native MS Analysis of Bacteriorhodopsin and an Empty Nanodisc by Orthogonal Acceleration Time-of-Flight, Orbitrap and Ion Cyclotron Resonance

Abstract

Over the past two decades orthogonal acceleration time-of-flight has been the de facto analyzer of choice for solution and membrane soluble protein native mass spectrometry (MS) studies; this however is gradually changing. Here we compare three MS instruments, the Q-ToF, the Orbitrap and the FT-ICR to analyze, under native instrument and buffer conditions, the 7-transmembrane helical protein bacteriorhodopsin-octylglucoside micelle complex and the empty nanodisc (MSP1D1-Nd) using both MS and tandem-MS modes of operation. Bacteriorhodopsin can be released from the octylglucoside-micelle efficiently on all three instruments (MS-mode of operation) producing a narrow charge state distribution (z = 8+ to 10+) by either increasing the source lens or collision cell (or HCD) voltages. A lower center-of-mass collision energy (0.20–0.41 eV) is required for optimal bacteriorhodopsin liberation on the FT-ICR, in comparison to the Q-ToF and Orbitrap instruments (0.29–2.47 eV). The empty MSP1D1-Nd can be measured with relative ease on a three instruments, resulting in a highly complex spectrum of overlapping, polydisperse charge state; a consequence of varying levels of phospholipid incorporation. There is a measurable difference in MSP1D1-Nd charge state distribution (z = 15+ to 26+), average molecular weight (141.7 to 169.6 kDa) and phospholipid incorporation number (143 to 184) under lowmore » activation conditions. Utilizing tandem-MS, bacteriorhodopsin can be effectively liberated from the octylglucoside-micelle by collisional (Q-ToF and FT-ICR) or continuous IRMPD activation (FT-ICR). MSP1D1-Nd spectral complexity can also be significantly reduced by tandem-MS (Q-ToF and FT-ICR) followed by mild collisional or continuous IRMPD activation, resulting in a spectrum in which the charge state and phospholipid incorporation levels can easily be determined.« less

Authors:
ORCiD logo [1];  [2];  [3];  [1];  [1];  [1];  [1];  [3];  [2]
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  1. Amgen, Thousand Oaks, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Amgen, South San Francisco, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1463127
Grant/Contract Number:  
FC03-02ER63421
Resource Type:
Accepted Manuscript
Journal Name:
Analytical Chemistry
Additional Journal Information:
Journal Volume: 88; Journal Issue: 24; Journal ID: ISSN 0003-2700
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Campuzano, Iain D. G., Li, Huilin, Bagal, Dhanashri, Lippens, Jennifer L., Svitel, Juraj, Kurzeja, Robert J. M., Xu, Han, Schnier, Paul D., and Loo, Joseph A. Native MS Analysis of Bacteriorhodopsin and an Empty Nanodisc by Orthogonal Acceleration Time-of-Flight, Orbitrap and Ion Cyclotron Resonance. United States: N. p., 2016. Web. doi:10.1021/acs.analchem.6b03762.
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Campuzano, Iain D. G., Li, Huilin, Bagal, Dhanashri, Lippens, Jennifer L., Svitel, Juraj, Kurzeja, Robert J. M., Xu, Han, Schnier, Paul D., & Loo, Joseph A. Native MS Analysis of Bacteriorhodopsin and an Empty Nanodisc by Orthogonal Acceleration Time-of-Flight, Orbitrap and Ion Cyclotron Resonance. United States. https://doi.org/10.1021/acs.analchem.6b03762
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Campuzano, Iain D. G., Li, Huilin, Bagal, Dhanashri, Lippens, Jennifer L., Svitel, Juraj, Kurzeja, Robert J. M., Xu, Han, Schnier, Paul D., and Loo, Joseph A. Wed . "Native MS Analysis of Bacteriorhodopsin and an Empty Nanodisc by Orthogonal Acceleration Time-of-Flight, Orbitrap and Ion Cyclotron Resonance". United States. https://doi.org/10.1021/acs.analchem.6b03762. https://www.osti.gov/servlets/purl/1463127.
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@article{osti_1463127,
title = {Native MS Analysis of Bacteriorhodopsin and an Empty Nanodisc by Orthogonal Acceleration Time-of-Flight, Orbitrap and Ion Cyclotron Resonance},
author = {Campuzano, Iain D. G. and Li, Huilin and Bagal, Dhanashri and Lippens, Jennifer L. and Svitel, Juraj and Kurzeja, Robert J. M. and Xu, Han and Schnier, Paul D. and Loo, Joseph A.},
abstractNote = {Over the past two decades orthogonal acceleration time-of-flight has been the de facto analyzer of choice for solution and membrane soluble protein native mass spectrometry (MS) studies; this however is gradually changing. Here we compare three MS instruments, the Q-ToF, the Orbitrap and the FT-ICR to analyze, under native instrument and buffer conditions, the 7-transmembrane helical protein bacteriorhodopsin-octylglucoside micelle complex and the empty nanodisc (MSP1D1-Nd) using both MS and tandem-MS modes of operation. Bacteriorhodopsin can be released from the octylglucoside-micelle efficiently on all three instruments (MS-mode of operation) producing a narrow charge state distribution (z = 8+ to 10+) by either increasing the source lens or collision cell (or HCD) voltages. A lower center-of-mass collision energy (0.20–0.41 eV) is required for optimal bacteriorhodopsin liberation on the FT-ICR, in comparison to the Q-ToF and Orbitrap instruments (0.29–2.47 eV). The empty MSP1D1-Nd can be measured with relative ease on a three instruments, resulting in a highly complex spectrum of overlapping, polydisperse charge state; a consequence of varying levels of phospholipid incorporation. There is a measurable difference in MSP1D1-Nd charge state distribution (z = 15+ to 26+), average molecular weight (141.7 to 169.6 kDa) and phospholipid incorporation number (143 to 184) under low activation conditions. Utilizing tandem-MS, bacteriorhodopsin can be effectively liberated from the octylglucoside-micelle by collisional (Q-ToF and FT-ICR) or continuous IRMPD activation (FT-ICR). MSP1D1-Nd spectral complexity can also be significantly reduced by tandem-MS (Q-ToF and FT-ICR) followed by mild collisional or continuous IRMPD activation, resulting in a spectrum in which the charge state and phospholipid incorporation levels can easily be determined.},
doi = {10.1021/acs.analchem.6b03762},
journal = {Analytical Chemistry},
number = 24,
volume = 88,
place = {United States},
year = {Wed Nov 16 00:00:00 EST 2016},
month = {Wed Nov 16 00:00:00 EST 2016}
}
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