Structure of a liganded type 2 non-specific lipid-transfer protein from wheat and the molecular basis of lipid binding.Hoh, F., Pons, J.L., Gautier, M.F., de Lamotte, F., Dumas, C.
(2005) Acta Crystallogr D Biol Crystallogr 61: 397-406
- PubMed: 15805594
- DOI: 10.1107/S0907444905000417
- Primary Citation of Related Structures:
- PubMed Abstract:
- Refined solution structure of a liganded type 2 wheat nonspecific lipid transfer protein
Pons, J.L., de Lamotte, F., Gautier, M.F., Delsuc, M.A.
(2003) J Biol Chem 278: 14249
In plants, a family of ubiquitous proteins named non-specific lipid-transfer proteins (ns-LTPs) facilitates the transfer of fatty acids, phospholipids and steroids between membranes. Recent data suggest that these secreted proteins play a key role in ...
In plants, a family of ubiquitous proteins named non-specific lipid-transfer proteins (ns-LTPs) facilitates the transfer of fatty acids, phospholipids and steroids between membranes. Recent data suggest that these secreted proteins play a key role in the formation of cuticular wax layers and in defence mechanisms against pathogens. In this study, X-ray crystallography has been used to examine the structural details of the interaction between a wheat type 2 ns-LTP and a lipid, L-alpha-palmitoyl-phosphatidyl glycerol. This crystal structure was solved ab initio at 1.12 A resolution by direct methods. The typical alpha-helical bundle fold of this protein is maintained by four disulfide bridges and delineates two hydrophobic cavities. The inner surface of the main cavity is lined by non-polar residues that provide a hydrophobic environment for the palmitoyl moiety of the lipid. The head-group region of this lipid protrudes from the surface and makes several polar interactions with a conserved patch of basic residues at the entrance of the pocket. The alkyl chain of a second lipid is bound within an adjacent smaller cavity. The structure shows that binding of the lipid tails to the protein involves extensive hydrophobic interactions.
Centre de Biochimie Structurale, CNRS UMR5048-INSERM U554, 29 Rue de Navacelles, 34090 Montpellier, France.