5FB7

Ligand binding domain 2 of Penicillium marneffei MP1 protein complexed with multiple arachidonic acids

Summary for 5FB7

• Entry DOI: 10.2210/pdb5fb7/pdb
• Related: 5CSD 5E7X 5ECF
• Descriptor: Envelope glycoprotein, ARACHIDONIC ACID (3 entities in total)
• Functional Keywords: ligand binding domain 2, multiple arachidonic acids, lipid binding protein
• Biological source: Talaromyces marneffei PM1
• Total number of polymer chains: 4
• Total formula weight: 68835.22

Authors

Lam, W.H.,Zhang, H.,Hao, Q. (deposition date: 2015-12-14, release date: 2016-12-14, Last modification date: 2023-11-08)

Primary citation

Sze, K.H.,Lam, W.H.,Zhang, H.,Ke, Y.H.,Tse, M.K.,Woo, P.C.,Lau, S.K.,Lau, C.C.,Cai, J.P.,Tung, E.T.,Lo, R.K.,Xu, S.,Kao, R.Y.,Hao, Q.,Yuen, K.Y.
Talaromyces marneffei Mp1p Is a Virulence Factor that Binds and Sequesters a Key Proinflammatory Lipid to Dampen Host Innate Immune Response
Cell Chem Biol, 24:182-194, 2017

PubMed Abstract: Talaromyces (Penicillium) marneffei is one of the leading causes of systemic mycosis in immunosuppressed or AIDS patients in Southeast Asia. How this intracellular pathogen evades the host immune defense remains unclear. We provide evidence that T. marneffei depletes levels of a key proinflammatory lipid mediator arachidonic acid (AA) to evade the host innate immune defense. Mechanistically, an abundant secretory mannoprotein Mp1p, shown previously to be a virulence factor, does so by binding AA with high affinity via a long hydrophobic central cavity found in the LBD2 domain. This sequesters a critical proinflammatory signaling lipid, and we see evidence that AA, AA's downstream metabolites, and the cytokines interleukin-6 and tumor necrosis factor α are downregulated in T. marneffei-infected J774 macrophages. Given that Mp1p-LBD2 homologs are identified in other fungal pathogens, we expect that this novel class of fatty-acid-binding proteins sequestering key proinflammatory lipid mediators represents a general virulence mechanism of pathogenic fungi.

PubMed: 28111099
DOI: 10.1016/j.chembiol.2016.12.014

Experimental method

X-RAY DIFFRACTION (1.5 Å)