8IF8

Arabinosyltransferase AftA


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of the priming arabinosyltransferase AftA required for AG biosynthesis of Mycobacterium tuberculosis.

Gong, Y.Wei, C.Wang, J.Mu, N.Lu, Q.Wu, C.Yan, N.Yang, H.Zhao, Y.Yang, X.Gurcha, S.S.Veerapen, N.Batt, S.M.Hao, Z.Da, L.Besra, G.S.Rao, Z.Zhang, L.

(2023) Proc Natl Acad Sci U S A 120: e2302858120-e2302858120

  • DOI: https://doi.org/10.1073/pnas.2302858120
  • Primary Citation of Related Structures:  
    8IF8

  • PubMed Abstract: 

    Arabinogalactan (AG) is an essential cell wall component in mycobacterial species, including the deadly human pathogen Mycobacterium tuberculosis . It plays a pivotal role in forming the rigid mycolyl-AG-peptidoglycan core for in vitro growth. AftA is a membrane-bound arabinosyltransferase and a key enzyme involved in AG biosynthesis which bridges the assembly of the arabinan chain to the galactan chain. It is known that AftA catalyzes the transfer of the first arabinofuranosyl residue from the donor decaprenyl-monophosphoryl-arabinose to the mature galactan chain (i.e., priming); however, the priming mechanism remains elusive. Herein, we report the cryo-EM structure of Mtb AftA. The detergent-embedded AftA assembles as a dimer with an interface maintained by both the transmembrane domain (TMD) and the soluble C-terminal domain (CTD) in the periplasm. The structure shows a conserved glycosyltransferase-C fold and two cavities converging at the active site. A metal ion participates in the interaction of TMD and CTD of each AftA molecule. Structural analyses combined with functional mutagenesis suggests a priming mechanism catalyzed by AftA in Mtb AG biosynthesis. Our data further provide a unique perspective into anti-TB drug discovery.


  • Organizational Affiliation

    Shanghai Institute for Advanced Immunochemical Studies, School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Galactan 5-O-arabinofuranosyltransferaseA [auth C],
B
643Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: aftARv3792
EC: 2.4.2.46
Membrane Entity: Yes 
UniProt
Find proteins for P9WN03 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WN03 
Go to UniProtKB:  P9WN03
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WN03
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other governmentChinainternal fund

Revision History  (Full details and data files)

  • Version 1.0: 2023-05-31
    Type: Initial release
  • Version 1.1: 2023-06-07
    Changes: Database references
  • Version 1.2: 2024-05-29
    Changes: Data collection