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| {{STRUCTURE_1jiv| PDB=1jiv | SCENE= }} | | {{STRUCTURE_1jiv| PDB=1jiv | SCENE= }} |
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| '''T4 phage BGT in complex with Mg2+ : Form II'''
| | ===T4 phage BGT in complex with Mg2+ : Form II=== |
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| ==Overview==
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| beta-Glucosyltransferase (BGT) is a DNA-modifying enzyme encoded by bacteriophage T4 that transfers glucose from uridine diphosphoglucose to 5-hydroxymethyl cytosine bases of phage T4 DNA. We report six X-ray structures of the substrate-free and the UDP-bound enzyme. Four also contain metal ions which activate the enzyme, including Mg(2+) in forms 1 and 2 and Mn(2+) or Ca(2+). The substrate-free BGT structure differs by a domain movement from one previously determined in another space group. Further domain movements are seen in the complex with UDP and the four UDP-metal complexes. Mg(2+), Mn(2+) and Ca(2+) bind near the beta-phosphate of the nucleotide, but they occupy slightly different positions and have different ligands depending on the metal and the crystal form. Whilst the metal site observed in these complexes with the product UDP is not compatible with a role in activating glucose transfer, it approximates the position of the positive charge in the oxocarbonium ion thought to form on the glucose moiety of the substrate during catalysis.
| | The line below this paragraph, {{ABSTRACT_PUBMED_11493010}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 11493010 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_11493010}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Ruger, W.]] | | [[Category: Ruger, W.]] |
| [[Category: Glycosyltransferase]] | | [[Category: Glycosyltransferase]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 21:16:38 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 20:18:45 2008'' |