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Characterization of the insertase BamA in three different membrane mimetics by solution NMR spectroscopy

Morgado, Leonor and Zeth, Kornelius and Burmann, Björn M. and Maier, Timm and Hiller, Sebastian . (2015) Characterization of the insertase BamA in three different membrane mimetics by solution NMR spectroscopy. Journal of biomolecular NMR, Vol. 61, H. 3-4. pp. 333-345.

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Official URL: http://edoc.unibas.ch/dok/A6348535

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Abstract

The insertase BamA is the central protein of the Bam complex responsible for outer membrane protein biogenesis in Gram-negative bacteria. BamA features a 16-stranded transmembrane β-barrel and five periplasmic POTRA domains, with a total molecular weight of 88 kDa. Whereas the structure of BamA has recently been determined by X-ray crystallography, its functional mechanism is not well understood. This mechanism comprises the insertion of substrates from a dynamic, chaperone-bound state into the bacterial outer membrane, and NMR spectroscopy is thus a method of choice for its elucidation. Here, we report solution NMR studies of different BamA constructs in three different membrane mimetic systems: LDAO micelles, DMPC:DiC7PC bicelles and MSP1D1:DMPC nanodiscs. The impact of biochemical parameters on the spectral quality was investigated, including the total protein concentration and the detergent:protein ratio. The barrel of BamA is folded in micelles, bicelles and nanodiscs, but the N-terminal POTRA5 domain is flexibly unfolded in the absence of POTRA4. Measurements of backbone dynamics show that the variable insertion region of BamA, located in the extracellular lid loop L6, features high local flexibility. Our work establishes biochemical preparation schemes for BamA, which will serve as a platform for structural and functional studies of BamA and its role within the Bam complex by solution NMR spectroscopy.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Structural Biology & Biophysics > Structural Biology (Hiller)
05 Faculty of Science > Departement Biozentrum > Structural Biology & Biophysics > Structural Biology (Maier)
UniBasel Contributors:Maier, Timm and Hiller Odermatt, Sebastian
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Springer
ISSN:0925-2738
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:13 Dec 2017 14:06
Deposited On:05 Jun 2015 08:52

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