6IWM

Structural insight into probable lipid transfer mechanism of non-specific lipid transfer protein via intermediate structures in Solanum melongena

Summary for 6IWM

• Entry DOI: 10.2210/pdb6iwm/pdb
• Descriptor: Non-specific lipid-transfer protein, GLYCEROL, SULFATE ION, ... (5 entities in total)
• Functional Keywords: nsltp, lipid transport
• Biological source: Solanum melongena (Eggplant)
• Total number of polymer chains: 2
• Total formula weight: 19399.79

Authors

Madni, Z.K.,Salunke, D.M. (deposition date: 2018-12-05, release date: 2019-12-11, Last modification date: 2024-10-30)

Primary citation

Madni, Z.K.,Tripathi, S.K.,Salunke, D.M.
Structural insights into the lipid transfer mechanism of a non-specific lipid transfer protein.
Plant J., 102:340-352, 2020

PubMed Abstract: The non-specific lipid transfer proteins (nsLTPs) are multifunctional seed proteins engaged in several different physiological processes. The nsLTPs are stabilized by four disulfide bonds and exhibit a characteristic hydrophobic cavity, which is the primary lipid binding site. While these proteins are known to transfer lipids between membranes, the mechanism of lipid transfer has remained elusive. Four crystal structures of nsLTP from Solanum melongena, one in the apo-state and three myristic acid bound states were determined. Among the three lipid bound states, two lipid molecules were bound on the nsLTP surface at different positions and one was inside the cavity. The lipid-dependent conformational changes leading to opening of the cavity were revealed based on structural and spectroscopic data. The surface-bound lipid represented a transient intermediate state and the lipid ultimately moved inside the cavity through the cavity gate as revealed by molecular dynamics simulations. Two critical residues in the loop regions played possible 'gating' role in the opening and closing of the cavity. Antifungal activity and membrane permeabilization effect of nsLTP against Fusarium oxysporum suggested that it could possibly involve in bleaching out the lipids. Collectively, these studies support a model of lipid transfer mechanism by nsLTP via intermediate states.

PubMed: 31793077
DOI: 10.1111/tpj.14627

Experimental method

X-RAY DIFFRACTION (1.98 Å)