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| [[Image:1mzm.jpg|left|200px]] | | {{Seed}} |
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| {{STRUCTURE_1mzm| PDB=1mzm | SCENE= }} | | {{STRUCTURE_1mzm| PDB=1mzm | SCENE= }} |
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| '''MAIZE NONSPECIFIC LIPID TRANSFER PROTEIN COMPLEXED WITH PALMITATE'''
| | ===MAIZE NONSPECIFIC LIPID TRANSFER PROTEIN COMPLEXED WITH PALMITATE=== |
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| ==Overview==
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| BACKGROUND: The movement of lipids between membranes is aided by lipid-transfer proteins (LTPs). Some LTPs exhibit broad specificity, transferring many classes of lipids, and are termed non-specific LTPs (ns-LTPs). Despite their apparently similar mode of action, no sequence homology exists between mammalian and plant ns-LTPs and no three-dimensional structure has been reported for any plant ns-LTP. RESULTS: We have determined the crystal structure of ns-LTP from maize seedlings by multiple isomorphous replacement and refined the structure to 1.9 A resolution. The protein comprises a single compact domain with four alpha-helices and a long C-terminal region. The eight conserved cysteines form four disulfide bridges (assigned as Cys4-Cys52, Cys14-Cys29, Cys30-Cys75, and Cys50-Cys89) resolving the ambiguity that remained from the chemical determination of pairings in the homologous protein from castor bean. Two of the bonds, Cys4-Cys52 and Cys50-Cys89, differ from what would have been predicted from sequence alignment with soybean hydrophobic protein. The complex between maize ns-LTP and hexadecanoate (palmitate) has also been crystallized and its structure refined to 1.8 A resolution. CONCLUSIONS: The fold of maize ns-LTP places it in a new category of all-alpha-type structure, first described for soybean hydrophobic protein. In the absence of a bound ligand, the protein has a tunnel-like hydrophobic cavity, which is large enough to accommodate a long fatty acyl chain. In the structure of the complex with palmitate, most of the acyl chain is buried inside this hydrophobic cavity.
| | The line below this paragraph, {{ABSTRACT_PUBMED_7735835}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 7735835 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_7735835}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Alpha-helical structure]] | | [[Category: Alpha-helical structure]] |
| [[Category: Lipid transport]] | | [[Category: Lipid transport]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 01:54:30 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 10:02:37 2008'' |
