2a0i: Difference between revisions
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|PDB= 2a0i |SIZE=350|CAPTION= <scene name='initialview01'>2a0i</scene>, resolution 2.72Å | |PDB= 2a0i |SIZE=350|CAPTION= <scene name='initialview01'>2a0i</scene>, resolution 2.72Å | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=DC:2'-DEOXYCYTIDINE-5'-MONOPHOSPHATE'>DC</scene>, <scene name='pdbligand=DG:2'-DEOXYGUANOSINE-5'-MONOPHOSPHATE'>DG</scene>, <scene name='pdbligand=DT:THYMIDINE-5'-MONOPHOSPHATE'>DT</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene> | ||
|ACTIVITY= | |ACTIVITY= | ||
|GENE= traI ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]) | |GENE= traI ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]) | ||
|DOMAIN= | |||
|RELATEDENTRY=[[1p4d|1P4D]] | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2a0i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2a0i OCA], [http://www.ebi.ac.uk/pdbsum/2a0i PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2a0i RCSB]</span> | |||
}} | }} | ||
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[[Category: Larkin, C.]] | [[Category: Larkin, C.]] | ||
[[Category: Schildbach, J F.]] | [[Category: Schildbach, J F.]] | ||
[[Category: 5-strand antiparallel beta sheet]] | [[Category: 5-strand antiparallel beta sheet]] | ||
[[Category: protein-dna complex]] | [[Category: protein-dna complex]] | ||
[[Category: single-stranded dna]] | [[Category: single-stranded dna]] | ||
''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 01:46:14 2008'' | ||
Revision as of 01:46, 31 March 2008
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| , resolution 2.72Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , , , , | ||||||
| Gene: | traI (Escherichia coli) | ||||||
| Related: | 1P4D
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
F Factor TraI Relaxase Domain bound to F oriT Single-stranded DNA
OverviewOverview
The TraI protein of conjugative plasmid F factor binds and cleaves a single-stranded region of the plasmid prior to transfer to a recipient. TraI36, an N-terminal TraI fragment, binds ssDNA with a subnanomolar K(D) and remarkable sequence specificity. The structure of the TraI36 Y16F variant bound to ssDNA reveals specificity determinants, including a ssDNA intramolecular 3 base interaction and two pockets within the protein's binding cleft that accommodate bases in a knob-into-hole fashion. Mutagenesis results underscore the intricate design of the binding site, with the greatest effects resulting from substitutions for residues that both contact ssDNA and stabilize protein structure. The active site architecture suggests that the bound divalent cation, which is essential for catalysis, both positions the DNA by liganding two oxygens of the scissile phosphate and increases the partial positive charge on the phosphorus to enhance nucleophilic attack.
About this StructureAbout this Structure
2A0I is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
ReferenceReference
Inter- and intramolecular determinants of the specificity of single-stranded DNA binding and cleavage by the F factor relaxase., Larkin C, Datta S, Harley MJ, Anderson BJ, Ebie A, Hargreaves V, Schildbach JF, Structure. 2005 Oct;13(10):1533-44. PMID:16216584
Page seeded by OCA on Mon Mar 31 01:46:14 2008