1vsk: Difference between revisions
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|SITE= <scene name='pdbsite=ACT:Active+Site'>ACT</scene> | |SITE= <scene name='pdbsite=ACT:Active+Site'>ACT</scene> | ||
|LIGAND= | |LIGAND= | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/RNA-directed_DNA_polymerase RNA-directed DNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.49 2.7.7.49] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/RNA-directed_DNA_polymerase RNA-directed DNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.49 2.7.7.49] </span> | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY= | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1vsk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1vsk OCA], [http://www.ebi.ac.uk/pdbsum/1vsk PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1vsk RCSB]</span> | |||
}} | }} | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 00:28:05 2008'' | ||
Revision as of 00:28, 31 March 2008
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| , resolution 2.2Å | |||||||
|---|---|---|---|---|---|---|---|
| Sites: | |||||||
| Activity: | RNA-directed DNA polymerase, with EC number 2.7.7.49 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
ASV INTEGRASE CORE DOMAIN D64N MUTATION IN CITRATE BUFFER PH 6.0
OverviewOverview
Crystallographic studies of the catalytic core domain of avian sarcoma virus integrase (ASV IN) have provided the most detailed picture so far of the active site of this enzyme, which belongs to an important class of targets for designing drugs against AIDS. Recently, crystals of an inactive D64N mutant were obtained under conditions identical to those used for the native enzyme. Data were collected at different pH values and in the presence of divalent cations. Data were also collected at low pH for the crystals of the native ASV IN core domain. In the structures of native ASV IN at pH 6.0 and below, as well as in all structures of the D64N mutants, the side chain of the active site residue Asx-64 (Asx denotes Asn or Asp) is rotated by approximately 150 degrees around the Calpha---Cbeta bond, compared with the structures at higher pH. In the new structures, this residue makes hydrogen bonds with the amide group of Asn-160, and thus, the usual metal-binding site, consisting of Asp-64, Asp-121, and Glu-157, is disrupted. Surprisingly, however, a single Zn2+ can still bind to Asp-121 in the mutant, without restoration of the activity of the enzyme. These structures have elucidated an unexpected mechanism of inactivation of the enzyme by lowering the pH or by mutation, in which a protonated side chain of Asx-64 changes its orientation and interaction partner.
About this StructureAbout this Structure
1VSK is a Single protein structure of sequence from Rous sarcoma virus. Full crystallographic information is available from OCA.
ReferenceReference
Structural basis for inactivating mutations and pH-dependent activity of avian sarcoma virus integrase., Lubkowski J, Yang F, Alexandratos J, Merkel G, Katz RA, Gravuer K, Skalka AM, Wlodawer A, J Biol Chem. 1998 Dec 4;273(49):32685-9. PMID:9830010
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