Outer Membrane Biogenesis


Konovalova, Anna, Daniel E Kahne, and Thomas J Silhavy. “Outer Membrane Biogenesis”. Annu Rev Microbiol 71 (2017): , 71, 539-556. Web.

Date Published:

2017 Sep 08




The hallmark of gram-negative bacteria and organelles such as mitochondria and chloroplasts is the presence of an outer membrane. In bacteria such as Escherichia coli, the outer membrane is a unique asymmetric lipid bilayer with lipopolysaccharide in the outer leaflet. Integral transmembrane proteins assume a β-barrel structure, and their assembly is catalyzed by the heteropentameric Bam complex containing the outer membrane protein BamA and four lipoproteins, BamB-E. How the Bam complex assembles a great diversity of outer membrane proteins into a membrane without an obvious energy source is a particularly challenging problem, because folding intermediates are predicted to be unstable in either an aqueous or a hydrophobic environment. Two models have been put forward: the budding model, based largely on structural data, and the BamA assisted model, based on genetic and biochemical studies. Here we offer a critical discussion of the pros and cons of each.



Alternate Journal:

Annu. Rev. Microbiol.