5E7X

Ligand binding domain 1 of Penicillium marneffei MP1 protein in complex with palmitic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

Talaromyces marneffeiMp1 protein, a novel virulence factor, carries two arachidonic acid-binding domains to suppress inflammatory responses in hosts.

Lam, W.H.Sze, K.H.Ke, Y.Tse, M.K.Zhang, H.Woo, P.C.Y.Lau, S.K.P.Lau, C.C.Y.Xu, S.Lai, P.M.Zhou, T.Antonyuk, S.V.Kao, R.Y.T.Yuen, K.Y.Hao, Q.

(2019) Infect. Immun. --: --

  • DOI: 10.1128/IAI.00679-18
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • <i>Talaromyces marneffei </i> infection causes talaromycosis (previously known as penicilliosis), a very important opportunistic systematic mycosis in immunocompromised patients. Different virulence mechanisms in <i>T. marneffei </i> have been prop ...

    Talaromyces marneffei infection causes talaromycosis (previously known as penicilliosis), a very important opportunistic systematic mycosis in immunocompromised patients. Different virulence mechanisms in T. marneffei have been proposed and investigated. In the sera of patients with talaromycosis, Mp1 protein (Mp1p), a secretory galactomannoprotein antigen with two tandem ligand-binding domains (Mp1p-LBD1 and Mp1p-LBD2), was found to be abundant. Mp1p-LBD2 was reported to possess a hydrophobic cavity to bind copurified palmitic acid (PLM). It was hypothesized that capturing of lipids from human hosts by expressing a large quantity of Mp1p is a virulence mechanism of T. marneffei It was shown that expression of Mp1p enhanced the intracellular survival of T. marneffei by suppressing proinflammatory responses. Mechanistic study of Mp1p-LBD2 suggested that arachidonic acid (AA), a precursor of paracrine signaling molecules for regulation of inflammatory responses, is the major physiological target of Mp1p-LBD2. In this study, we use crystallographic and biochemical techniques to further demonstrate that Mp1p-LBD1, the previously unsolved first lipid binding domain of Mp1p, is also a strong AA-binding domain in Mp1p. These studies on Mp1p-LBD1 support the idea that the highly expressed Mp1p is an effective AA-capturing protein. Each Mp1p can bind up to 4 AA molecules. The crystal structure of Mp1p-LBD1-LBD2 has also been solved, showing that both LBDs are likely to function independently with a flexible linker between them. T. marneffei and potentially other pathogens highly expressing and secreting proteins similar to Mp1p can severely disturb host signaling cascades during proinflammatory responses by reducing the availabilities of important paracrine signaling molecules.


    Organizational Affiliation

    School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, China.,Department of Microbiology, The University of Hong Kong, Hong Kong SAR, China.,State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong, Hong Kong SAR, China kyyuen@hku.hk qhao@hku.hk.,Shenzhen Institute of Innovation and Research, The University of Hong Kong, Shenzhen, China.,Research Centre of Infection and Immunity, The University of Hong Kong, Hong Kong SAR, China.,School of Biomedical Sciences, The University of Hong Kong, Hong Kong SAR, China kyyuen@hku.hk qhao@hku.hk.,Carol Yu Centre for Infection, The University of Hong Kong, Hong Kong SAR, China.,Department of Biology and Shenzhen Key Laboratory of Cell Microenvironment, Southern University of Science and Technology, Shenzhen, China.,State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong, Hong Kong SAR, China.,Molecular Biophysics Group, University of Liverpool, Liverpool, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cell wall antigen
A
155Talaromyces marneffeiMutation(s): 0 
Gene Names: MP1
Find proteins for A8HBN5 (Talaromyces marneffei)
Go to UniProtKB:  A8HBN5
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
PLM
Query on PLM

Download SDF File 
Download CCD File 
A
PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.179 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 52.580α = 90.00
b = 52.580β = 90.00
c = 57.690γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
REFMACrefinement
PHASERphasing
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-10-19
    Type: Initial release
  • Version 2.0: 2019-03-06
    Type: Atomic model, Data collection, Database references, Derived calculations, Refinement description, Source and taxonomy, Structure summary