6ptd: Difference between revisions
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[[Image:6ptd.gif|left|200px]] | [[Image:6ptd.gif|left|200px]] | ||
'''PHOSPHATIDYLINOSITOL-SPECIFIC PHOSPHOLIPASE C MUTANT H32L''' | {{Structure | ||
|PDB= 6ptd |SIZE=350|CAPTION= <scene name='initialview01'>6ptd</scene>, resolution 2.6Å | |||
|SITE= <scene name='pdbsite=ACT:Active+Site'>ACT</scene> | |||
|LIGAND= | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Transferred_entry:_4.6.1.13 Transferred entry: 4.6.1.13], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.4.10 3.1.4.10] | |||
|GENE= PI-PLC GENE ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1396 Bacillus cereus]) | |||
}} | |||
'''PHOSPHATIDYLINOSITOL-SPECIFIC PHOSPHOLIPASE C MUTANT H32L''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
6PTD is a [ | 6PTD is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Bacillus_cereus Bacillus cereus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6PTD OCA]. | ||
==Reference== | ==Reference== | ||
Probing the roles of active site residues in phosphatidylinositol-specific phospholipase C from Bacillus cereus by site-directed mutagenesis., Gassler CS, Ryan M, Liu T, Griffith OH, Heinz DW, Biochemistry. 1997 Oct 21;36(42):12802-13. PMID:[http:// | Probing the roles of active site residues in phosphatidylinositol-specific phospholipase C from Bacillus cereus by site-directed mutagenesis., Gassler CS, Ryan M, Liu T, Griffith OH, Heinz DW, Biochemistry. 1997 Oct 21;36(42):12802-13. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9335537 9335537] | ||
[[Category: Bacillus cereus]] | [[Category: Bacillus cereus]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: phosphoric diester]] | [[Category: phosphoric diester]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 19:13:54 2008'' | ||
Revision as of 20:14, 20 March 2008
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| , resolution 2.6Å | |||||||
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| Sites: | |||||||
| Gene: | PI-PLC GENE (Bacillus cereus) | ||||||
| Activity: | Transferred entry: 4.6.1.13, with EC number 3.1.4.10 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
PHOSPHATIDYLINOSITOL-SPECIFIC PHOSPHOLIPASE C MUTANT H32L
OverviewOverview
The role of amino acid residues located in the active site pocket of phosphatidylinositol-specific phospholipase C (PI-PLC) from Bacillus cereus[Heinz, D. W., Ryan, M., Bullock, T., & Griffith, O. H. (1995) EMBO J. 14, 3855-3863] was investigated by site-directed mutagenesis, kinetics, and crystal structure analysis. Twelve residues involved in catalysis and substrate binding (His32, Arg69, His82, Gly83, Lys115, Glu117, Arg163, Trp178, Asp180, Asp198, Tyr200, and Asp274) were individually replaced by 1-3 other amino acids, resulting in a total number of 21 mutants. Replacements in the mutants H32A, H32L, R69A, R69E, R69K, H82A, H82L, E117K, R163I, D198A, D198E, D198S, Y200S, and D274S caused essentially complete inactivation of the enzyme. The remaining mutants (G83S, K115E, R163K, W178Y, D180S, Y200F, and D274N) exhibited reduced activities up to 57% when compared with wild-type PI-PLC. Crystal structures determined at a resolution ranging from 2.0 to 2.7 A for six mutants (H32A, H32L, R163K, D198E, D274N, and D274S) showed that significant changes were confined to the site of the respective mutation without perturbation of the rest of the structure. Only in mutant D198E do the side chains of two neighboring arginine residues move across the inositol binding pocket toward the newly introduced glutamic acid. An analysis of these structure-function relationships provides new insight into the catalytic mechanism, and suggests a molecular explanation of some of the substrate stereospecificity and inhibitor binding data available for this enzyme.
About this StructureAbout this Structure
6PTD is a Single protein structure of sequence from Bacillus cereus. Full crystallographic information is available from OCA.
ReferenceReference
Probing the roles of active site residues in phosphatidylinositol-specific phospholipase C from Bacillus cereus by site-directed mutagenesis., Gassler CS, Ryan M, Liu T, Griffith OH, Heinz DW, Biochemistry. 1997 Oct 21;36(42):12802-13. PMID:9335537
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