Detection of Lipid-Bound Bacteriorhodopsin Trimer Complex Directly from Purple Membrane by Native Mass Spectrometry.
J Am Soc Mass Spectrom
; 34(12): 2620-2624, 2023 Dec 06.
Article
de En
| MEDLINE
| ID: mdl-37975648
ABSTRACT
Native mass spectrometry (MS) was used to detect the membrane protein, bacteriorhodopsin (bR), in its 27 kDa monomeric form and trimeric assemblies directly from lipid-containing purple membranes (PMs) from the halophilic archaeon, Halobacterium salinarum. Trimer bR ion populations bound to lipid molecules were detected with n-octyl ß-d-glucopyranoside as the solubilizing detergent; the use of octyl tetraethylene glycol monooctyl ether or n-dodecyl-ß-d-maltopyranoside resulted in only detection of monomeric bR. The archaeal lipids phosphotidylglycerolphosphate methyl ester and 3-HSO3-Galp-ß1,6-Manp-α1,2-Glcp-α1,1-sn-2,3-diphytanylglycerol were the only lipids in the PMs found to bind to bR, consistent with previous high-resolution structural studies. Removal of the lipids from the sample resulted in the detection of only the bR monomer, highlighting the importance of specific lipids for stabilizing the bR trimer. To the best of our knowledge, this is the first report of the detection of the bR trimer with resolved lipid-bound species by MS.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Bactériorhodopsines
/
Membrane pourpre
Langue:
En
Journal:
J Am Soc Mass Spectrom
Année:
2023
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique