7BOO

Crystal Structure of Core-mannan synthase A (CmsA/Ktr4) from Aspergillus fumigatus, apo form

PDB DOI: 10.2210/pdb7BOO/pdb

Classification: TRANSFERASE
Organism(s): Aspergillus fumigatus A1163
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2020-03-19 Released: 2020-09-09
Deposition Author(s): Hira, D., Onoue, T., Oka, T.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.95 Å
R-Value Free: 0.186
R-Value Work: 0.163
R-Value Observed: 0.164

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

Structural basis for the core-mannan biosynthesis of cell wall fungal-type galactomannan in Aspergillus fumigatus .

Hira, D., Onoue, T., Oka, T.

(2020) J Biol Chem 295: 15407-15417

PubMed: 32873705 Search on PubMedSearch on PubMed Central
DOI: 10.1074/jbc.RA120.013742
Primary Citation of Related Structures:
7BOO, 7BOP

PubMed Abstract:

Fungal cell walls and their biosynthetic enzymes are potential targets for novel antifungal agents. Recently, two mannosyltransferases, namely core-mannan synthases A (CmsA/Ktr4) and B (CmsB/Ktr7), were found to play roles in the core-mannan biosynthesis of fungal-type galactomannan. CmsA/Ktr4 is an α-(1→2)-mannosyltransferase responsible for α-(1→2)-mannan biosynthesis in fungal-type galactomannan, which covers the cell surface of Aspergillus fumigatus Strains with disrupted cmsA / ktr4 have been shown to exhibit strongly suppressed hyphal elongation and conidiation alongside reduced virulence in a mouse model of invasive aspergillosis, indicating that CmsA/Ktr4 is a potential novel antifungal candidate. In this study we present the 3D structures of the soluble catalytic domain of CmsA/Ktr4, as determined by X-ray crystallography at a resolution of 1.95 Å, as well as the enzyme and Mn ²⁺/GDP complex to 1.90 Å resolution. The CmsA/Ktr4 protein not only contains a highly conserved binding pocket for the donor substrate, GDP-mannose, but also has a unique broad cleft structure formed by its N- and C-terminal regions and is expected to recognize the acceptor substrate, a mannan chain. Based on these crystal structures, we also present a 3D structural model of the enzyme-substrate complex generated using docking and molecular dynamics simulations with α-Man-(1→6)-α-Man-(1→2)-α-Man-OMe as the model structure for the acceptor substrate. This predicted enzyme-substrate complex structure is also supported by findings from single amino acid substitution CmsA/Ktr4 mutants expressed in Δ cmsA/ktr4 A. fumigatus cells. Taken together, these results provide basic information for developing specific α-mannan biosynthesis inhibitors for use as pharmaceuticals and/or pesticides.

Organizational Affiliation:

Department of Applied Microbial Technology, Faculty of Biotechnology and Life Science, Sojo University, Kumamoto, Kumamoto, Japan. Electronic address: oka@bio.sojo-u.ac.jp.

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Alpha-1,2-mannosyltransferase (Ktr4), putative	A, B, C, D, E, F A, B, C, D, E, F	386	Aspergillus fumigatus A1163	Mutation(s): 0 Gene Names: AFUB_051270
UniProt
Find proteins for B0Y2F5 (Neosartorya fumigata (strain CEA10 / CBS 144.89 / FGSC A1163)) Explore B0Y2F5 Go to UniProtKB: B0Y2F5
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	B0Y2F5
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
GOL Query on GOL Download Ideal Coordinates CCD File SDF format, chain AA [auth E] SDF format, chain BA [auth E] SDF format, chain CA [auth E] SDF format, chain DA [auth E] SDF format, chain EA [auth E] SDF format, chain FA [auth F] SDF format, chain GA [auth F] SDF format, chain HA [auth F] SDF format, chain I [auth A] SDF format, chain J [auth A] SDF format, chain K [auth A] SDF format, chain L [auth A] SDF format, chain O [auth B] SDF format, chain P [auth B] SDF format, chain Q [auth B] SDF format, chain S [auth C] SDF format, chain T [auth C] SDF format, chain W [auth D] SDF format, chain X [auth D] SDF format, chain Y [auth D] SDF format, chain Z [auth D] MOL2 format, chain AA [auth E] MOL2 format, chain BA [auth E] MOL2 format, chain CA [auth E] MOL2 format, chain DA [auth E] MOL2 format, chain EA [auth E] MOL2 format, chain FA [auth F] MOL2 format, chain GA [auth F] MOL2 format, chain HA [auth F] MOL2 format, chain I [auth A] MOL2 format, chain J [auth A] MOL2 format, chain K [auth A] MOL2 format, chain L [auth A] MOL2 format, chain O [auth B] MOL2 format, chain P [auth B] MOL2 format, chain Q [auth B] MOL2 format, chain S [auth C] MOL2 format, chain T [auth C] MOL2 format, chain W [auth D] MOL2 format, chain X [auth D] MOL2 format, chain Y [auth D] MOL2 format, chain Z [auth D]	AA [auth E], BA [auth E], CA [auth E], DA [auth E], EA [auth E], AA [auth E], BA [auth E], CA [auth E], DA [auth E], EA [auth E], FA [auth F], GA [auth F], HA [auth F], I [auth A], J [auth A], K [auth A], L [auth A], O [auth B], P [auth B], Q [auth B], S [auth C], T [auth C], W [auth D], X [auth D], Y [auth D], Z [auth D]	GLYCEROL C₃ H₈ O₃ PEDCQBHIVMGVHV-UHFFFAOYSA-N		Ligand Interaction
NA Query on NA Download Ideal Coordinates CCD File SDF format, chain G [auth A] SDF format, chain H [auth A] SDF format, chain M [auth B] SDF format, chain N [auth B] SDF format, chain R [auth C] SDF format, chain U [auth D] SDF format, chain V [auth D] MOL2 format, chain G [auth A] MOL2 format, chain H [auth A] MOL2 format, chain M [auth B] MOL2 format, chain N [auth B] MOL2 format, chain R [auth C] MOL2 format, chain U [auth D] MOL2 format, chain V [auth D]	G [auth A], H [auth A], M [auth B], N [auth B], R [auth C], G [auth A], H [auth A], M [auth B], N [auth B], R [auth C], U [auth D], V [auth D]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N		Ligand Interaction