Proteomics

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Development of a Method Combining Peptidiscs and Proteomics to Identify, Stabilize and Purify a Detergent-Sensitive Membrane Protein Assembly


ABSTRACT: The peptidisc membrane mimetic enables global reconstitution of the bacterial membrane proteome into water-soluble detergent-free particles, termed peptidisc libraries. We present here a method that combines peptidisc libraries and chromosomal-level gene tagging technology with affinity purification and mass spectrometry (AP/MS) to stabilize and identify fragile membrane protein complexes that exist at native expression levels. This method circumvents common artifacts caused by bait protein overproduction and protein complex dissociation due to lengthy exposure to detergents during protein isolation. Using the E. coli Sec system as a case study, we identify an expanded version of the translocon, termed the HMD complex, consisting of 9 different integral membrane subunits. This complex is stable in peptidiscs but dissociates in detergent. Guided by this native-level proteomic information, we design and validate a procedure that enables purification of the HMD complex with minimal protein dissociation. These results highlight the utility of peptidiscs and AP/MS to discover and stabilize fragile membrane protein assemblies.

INSTRUMENT(S): LTQ Orbitrap Elite

ORGANISM(S): Escherichia Coli

SUBMITTER: John Young  

LAB HEAD: Franck Duong

PROVIDER: PXD032315 | Pride | 2022-06-09

REPOSITORIES: Pride

Dataset's files

Source:
Action DRS
DY330_detergent_rep1.raw Raw
DY330_detergent_rep2.raw Raw
DY330_detergent_rep3.raw Raw
DY330_peptidisc_rep1.raw Raw
DY330_peptidisc_rep2.raw Raw
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Publications

Development of a Method Combining Peptidiscs and Proteomics to Identify, Stabilize, and Purify a Detergent-Sensitive Membrane Protein Assembly.

Young John William JW   Wason Irvinder Singh IS   Zhao Zhiyu Z   Kim Sunyoung S   Aoki Hiroyuki H   Phanse Sadhna S   Rattray David G DG   Foster Leonard J LJ   Babu Mohan M   Duong van Hoa Franck F  

Journal of proteome research 20220526 7


The peptidisc membrane mimetic enables global reconstitution of the bacterial membrane proteome into water-soluble detergent-free particles, termed peptidisc libraries. We present here a method that combines peptidisc libraries and chromosomal-level gene tagging technology with affinity purification and mass spectrometry (AP/MS) to stabilize and identify fragile membrane protein complexes that exist at native expression levels. This method circumvents common artifacts caused by bait protein over  ...[more]

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