7BX8

Mycobacterium smegmatis arabinosyltransferase complex EmbB2-AcpM2 in symmetric "resting state"


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Cryo-EM snapshots of mycobacterial arabinosyltransferase complex EmbB2-AcpM2.

Zhang, L.Zhao, Y.Gao, R.Li, J.Yang, X.Gao, Y.Zhao, W.Gurcha, S.S.Veerapen, N.Batt, S.M.Besra, K.K.Xu, W.Bi, L.Zhang, X.Guddat, L.W.Yang, H.Wang, Q.Besra, G.S.Rao, Z.

(2020) Protein Cell 11: 505-517

  • DOI: 10.1007/s13238-020-00726-6
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Inhibition of Mycobacterium tuberculosis (Mtb) cell wall assembly is an established strategy for anti-TB chemotherapy. Arabinosyltransferase EmbB, which catalyzes the transfer of arabinose from the donor decaprenyl-phosphate-arabinose (DPA) to its ar ...

    Inhibition of Mycobacterium tuberculosis (Mtb) cell wall assembly is an established strategy for anti-TB chemotherapy. Arabinosyltransferase EmbB, which catalyzes the transfer of arabinose from the donor decaprenyl-phosphate-arabinose (DPA) to its arabinosyl acceptor is an essential enzyme for Mtb cell wall synthesis. Analysis of drug resistance mutations suggests that EmbB is the main target of the front-line anti-TB drug, ethambutol. Herein, we report the cryo-EM structures of Mycobacterium smegmatis EmbB in its "resting state" and DPA-bound "active state". EmbB is a fifteen-transmembrane-spanning protein, assembled as a dimer. Each protomer has an associated acyl-carrier-protein (AcpM) on their cytoplasmic surface. Conformational changes upon DPA binding indicate an asymmetric movement within the EmbB dimer during catalysis. Functional studies have identified critical residues in substrate recognition and catalysis, and demonstrated that ethambutol inhibits transferase activity of EmbB by competing with DPA. The structures represent the first step directed towards a rational approach for anti-TB drug discovery.


    Organizational Affiliation

    Laboratory of Structural Biology, Tsinghua University, Beijing, 100084, China. raozh@tsinghua.edu.cn.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Integral membrane indolylacetylinositol arabinosyltransferase EmbBA, B1082Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: embBMSMEI_6221MSMEG_6389
EC: 2.4.2.34 (PDB Primary Data), 2.4.2 (UniProt)
Find proteins for A0R614 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0R614 
Go to UniProtKB:  A0R614
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Meromycolate extension acyl carrier proteinC, D99Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: acpMMSMEG_4326MSMEI_4226
Find proteins for A0R0B3 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0R0B3 
Go to UniProtKB:  A0R0B3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (MoST, China)China2017YFC0840300
National Natural Science Foundation of China (NSFC)China81520108019

Revision History 

  • Version 1.0: 2020-05-27
    Type: Initial release
  • Version 1.1: 2020-07-08
    Changes: Database references