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The gain-of-function allele bamA E470K bypasses the essential requirement for BamD in ?-barrel outer membrane protein assembly.


ABSTRACT: The outer membrane (OM) of gram-negative bacteria confers innate resistance to toxins and antibiotics. Integral ?-barrel outer membrane proteins (OMPs) function to establish and maintain the selective permeability of the OM. OMPs are assembled into the OM by the ?-barrel assembly machine (BAM), which is composed of one OMP-BamA-and four lipoproteins-BamB, C, D, and E. BamB, C, and E can be removed individually with only minor effects on barrier function; however, depletion of either BamA or BamD causes a global defect in OMP assembly and results in cell death. We have identified a gain-of-function mutation, bamA E470K , that bypasses the requirement for BamD. Although bamD::kan bamA E470K cells exhibit growth and OM barrier defects, they assemble OMPs with surprising robustness. Our results demonstrate that BamD does not play a catalytic role in OMP assembly, but rather functions to regulate the activity of BamA.

SUBMITTER: Hart EM 

PROVIDER: S-EPMC7414184 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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The gain-of-function allele <i>bamA</i><sub><i>E470K</i></sub> bypasses the essential requirement for BamD in β-barrel outer membrane protein assembly.

Hart Elizabeth M EM   Gupta Meera M   Wühr Martin M   Silhavy Thomas J TJ  

Proceedings of the National Academy of Sciences of the United States of America 20200716 31


The outer membrane (OM) of gram-negative bacteria confers innate resistance to toxins and antibiotics. Integral β-barrel outer membrane proteins (OMPs) function to establish and maintain the selective permeability of the OM. OMPs are assembled into the OM by the β-barrel assembly machine (BAM), which is composed of one OMP-BamA-and four lipoproteins-BamB, C, D, and E. BamB, C, and E can be removed individually with only minor effects on barrier function; however, depletion of either BamA or BamD  ...[more]

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