Structural basis of outer membrane protein insertion by the BAM complex.
Nature
; 531(7592): 64-9, 2016 Mar 03.
Article
in En
| MEDLINE
| ID: mdl-26901871
ABSTRACT
All Gram-negative bacteria, mitochondria and chloroplasts have outer membrane proteins (OMPs) that perform many fundamental biological processes. The OMPs in Gram-negative bacteria are inserted and folded into the outer membrane by the ß-barrel assembly machinery (BAM). The mechanism involved is poorly understood, owing to the absence of a structure of the entire BAM complex. Here we report two crystal structures of the Escherichia coli BAM complex in two distinct states an inward-open state and a lateral-open state. Our structures reveal that the five polypeptide transport-associated domains of BamA form a ring architecture with four associated lipoproteins, BamB-BamE, in the periplasm. Our structural, functional studies and molecular dynamics simulations indicate that these subunits rotate with respect to the integral membrane ß-barrel of BamA to induce movement of the ß-strands of the barrel and promote insertion of the nascent OMP.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Bacterial Outer Membrane Proteins
/
Escherichia coli Proteins
/
Multiprotein Complexes
/
Escherichia coli
Language:
En
Journal:
Nature
Year:
2016
Document type:
Article
Affiliation country:
United kingdom