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| {{STRUCTURE_1p6e| PDB=1p6e | SCENE= }} | | {{STRUCTURE_1p6e| PDB=1p6e | SCENE= }} |
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| '''STRUCTURE OF THE D55N MUTANT OF PHOSPHOLIPASE C FROM BACILLUS CEREUS IN COMPLEX WITH 1,2-DI-N-PENTANOYL-SN-GLYCERO-3-DITHIOPHOSPHOCHOLINE'''
| | ===STRUCTURE OF THE D55N MUTANT OF PHOSPHOLIPASE C FROM BACILLUS CEREUS IN COMPLEX WITH 1,2-DI-N-PENTANOYL-SN-GLYCERO-3-DITHIOPHOSPHOCHOLINE=== |
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| ==Overview==
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| Because mutations of the ionizable Asp at position 55 of the phosphatidylcholine preferring phospholipase C from Bacillus cereus (PLC(Bc)) to a non-ionizable Asn generate a mutant enzyme (D55N) with 10(4)-fold lower catalytic activity than the wild-type enzyme, we tentatively identified Asp55 as the general base for the enzymatic reaction. To eliminate the alternate possibility that Asp55 is a structurally important amino acid, the X-ray structures of unbound D55N and complexes of D55N with two non-hydrolyzable substrate analogues have been solved and refined to 2.0, 2.0, and 2.3A, respectively. The structures of unbound wild-type PLC(Bc) and a wild-type PLC(Bc)-complex with a non-hydrolyzable substrate analogue do not change significantly as a result of replacing Asp55 with Asn. These observations demonstrate that Asp55 is not critical for the structural integrity of the enzyme and support the hypothesis that Asp55 is the general base in the PLC(Bc)-catalyzed hydrolysis of phospholipids.
| | The line below this paragraph, {{ABSTRACT_PUBMED_12921783}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 12921783 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_12921783}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Protein-phospholipid analogue complex]] | | [[Category: Protein-phospholipid analogue complex]] |
| [[Category: Tri zn+2 metal core]] | | [[Category: Tri zn+2 metal core]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 04:44:28 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 23:27:17 2008'' |