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2012 ; 2012
(ä): 708203
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Assembly of the ?-Barrel Outer Membrane Proteins in Gram-Negative Bacteria,
Mitochondria, and Chloroplasts
#MMPMID27335668
Misra R
ISRN Mol Biol
2012[]; 2012
(ä): 708203
PMID27335668
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In the last decade, there has been an explosion of publications on the assembly
of ?-barrel outer membrane proteins (OMPs), which carry out diverse cellular
functions, including solute transport, protein secretion, and assembly of protein
and lipid components of the outer membrane. Of the three outer membrane model
systems-Gram-negative bacteria, mitochondria and chloroplasts-research on
bacterial and mitochondrial systems has so far led the way in dissecting the
?-barrel OMP assembly pathways. Many exciting discoveries have been made,
including the identification of ?-barrel OMP assembly machineries in bacteria and
mitochondria, and potentially the core assembly component in chloroplasts. The
atomic structures of all five components of the bacterial ?-barrel assembly
machinery (BAM) complex, except the ?-barrel domain of the core BamA protein,
have been solved. Structures reveal that these proteins contain domains/motifs
known to facilitate protein-protein interactions, which are at the heart of the
assembly pathways. While structural information has been valuable, most of our
current understanding of the ?-barrel OMP assembly pathways has come from
genetic, molecular biology, and biochemical analyses. This paper provides a
comparative account of the ?-barrel OMP assembly pathways in Gram-negative
bacteria, mitochondria, and chloroplasts.