Structural highlights
Function
[BAME_ECOLI] Part of the outer membrane protein assembly complex, which is involved in assembly and insertion of beta-barrel proteins into the outer membrane. Nonessential member of the complex that stabilizes the interaction between the essential proteins BamA and BamD. May modulate the conformation of BamA, likely through interactions with BamD.[1] [2] [3] [4] [5] [6]
Publication Abstract from PubMed
In Escherichia coli, a multicomponent BAM (beta-barrel assembly machinery) complex is responsible for recognition and assembly of outer membrane beta-barrel proteins. The functionality of BAM in protein biogenesis is mainly orchestrated through the presence of two essential components, BamA and BamD. Here, we present crystal structures of four lipoproteins (BamB-E). Monomeric BamB and BamD proteins display scaffold architectures typically implied in transient protein interactions. BamB is a beta-propeller protein comprising eight WD40 repeats. BamD shows an elongated fold on the basis of five tetratricopeptide repeats, three of which form the scaffold for protein recognition. The rod-shaped BamC protein has evolved through the gene duplication of two conserved domains known to mediate protein interactions in structurally related complexes. By contrast, the dimeric BamE is formed through a domain swap and indicates fold similarity to the beta-lactamase inhibitor protein family, possibly integrating cell wall stability in BAM function. Structural and biochemical data show evidence for the specific recognition of amphipathic sequences through the tetratricopeptide repeat architecture of BamD. Collectively, our data advance the understanding of the BAM complex and highlight the functional importance of BamD in amphipathic outer membrane beta-barrel protein motif recognition and protein delivery.
Structural basis of outer membrane protein biogenesis in bacteria.,Albrecht R, Zeth K J Biol Chem. 2011 Aug 5;286(31):27792-803. Epub 2011 May 17. PMID:21586578[7]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Sklar JG, Wu T, Gronenberg LS, Malinverni JC, Kahne D, Silhavy TJ. Lipoprotein SmpA is a component of the YaeT complex that assembles outer membrane proteins in Escherichia coli. Proc Natl Acad Sci U S A. 2007 Apr 10;104(15):6400-5. Epub 2007 Apr 2. PMID:17404237 doi:10.1073/pnas.0701579104
- ↑ Hagan CL, Kim S, Kahne D. Reconstitution of outer membrane protein assembly from purified components. Science. 2010 May 14;328(5980):890-2. doi: 10.1126/science.1188919. Epub 2010 Apr, 8. PMID:20378773 doi:10.1126/science.1188919
- ↑ Hagan CL, Kahne D. The reconstituted Escherichia coli Bam complex catalyzes multiple rounds of beta-barrel assembly. Biochemistry. 2011 Sep 6;50(35):7444-6. doi: 10.1021/bi2010784. Epub 2011 Aug 11. PMID:21823654 doi:10.1021/bi2010784
- ↑ Rigel NW, Schwalm J, Ricci DP, Silhavy TJ. BamE modulates the Escherichia coli beta-barrel assembly machine component BamA. J Bacteriol. 2012 Mar;194(5):1002-8. doi: 10.1128/JB.06426-11. Epub 2011 Dec 16. PMID:22178970 doi:10.1128/JB.06426-11
- ↑ Kim KH, Kang HS, Okon M, Escobar-Cabrera E, McIntosh LP, Paetzel M. Structural Characterization of Escherichia coli BamE, a Lipoprotein Component of the beta-Barrel Assembly Machinery Complex. Biochemistry. 2011 Feb 15;50(6):1081-90. Epub 2011 Jan 24. PMID:21207987 doi:10.1021/bi101659u
- ↑ Albrecht R, Zeth K. Structural basis of outer membrane protein biogenesis in bacteria. J Biol Chem. 2011 Aug 5;286(31):27792-803. Epub 2011 May 17. PMID:21586578 doi:10.1074/jbc.M111.238931
- ↑ Albrecht R, Zeth K. Structural basis of outer membrane protein biogenesis in bacteria. J Biol Chem. 2011 Aug 5;286(31):27792-803. Epub 2011 May 17. PMID:21586578 doi:10.1074/jbc.M111.238931
