2gyk: Difference between revisions
No edit summary |
No edit summary |
||
| Line 4: | Line 4: | ||
|PDB= 2gyk |SIZE=350|CAPTION= <scene name='initialview01'>2gyk</scene>, resolution 1.600Å | |PDB= 2gyk |SIZE=350|CAPTION= <scene name='initialview01'>2gyk</scene>, resolution 1.600Å | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/Deoxyribonuclease_I Deoxyribonuclease I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.21.1 3.1.21.1] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Deoxyribonuclease_I Deoxyribonuclease I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.21.1 3.1.21.1] </span> | ||
|GENE= IMM9_ECOLI ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]), col, cei ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]) | |GENE= IMM9_ECOLI ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]), col, cei ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli]) | ||
|DOMAIN= | |||
|RELATEDENTRY=[[iemv|IEMV]], [[1bxi|1BXI]], [[2gze|2GZE]], [[2gzf|2GZF]], [[2gzg|2GZG]], [[2gzi|2GZI]], [[2gzj|2GZJ]] | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2gyk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gyk OCA], [http://www.ebi.ac.uk/pdbsum/2gyk PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2gyk RCSB]</span> | |||
}} | }} | ||
| Line 27: | Line 30: | ||
[[Category: Kuhlmann, U C.]] | [[Category: Kuhlmann, U C.]] | ||
[[Category: Santi, P S.]] | [[Category: Santi, P S.]] | ||
[[Category: 4-helix bundle]] | [[Category: 4-helix bundle]] | ||
[[Category: dnase domain]] | [[Category: dnase domain]] | ||
| Line 34: | Line 35: | ||
[[Category: protein-protein complex]] | [[Category: protein-protein complex]] | ||
''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 03:23:01 2008'' | ||
Revision as of 03:23, 31 March 2008
| |||||||
| , resolution 1.600Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , | ||||||
| Gene: | IMM9_ECOLI (Escherichia coli), col, cei (Escherichia coli) | ||||||
| Activity: | Deoxyribonuclease I, with EC number 3.1.21.1 | ||||||
| Related: | IEMV, 1BXI, 2GZE, 2GZF, 2GZG, 2GZI, 2GZJ
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of the complex of the Colicin E9 DNase domain with a mutant immunity protein, IMME9 (D51A)
OverviewOverview
The crystal structure of the cytotoxic endonuclease domain from the bacterial toxin colicin E9 in complex with its cognate immunity protein Im9 reveals that the inhibitor does not bind at the active site, the core of which comprises the HNH motif found in intron-encoded homing endonucleases, but rather at an adjacent position leaving the active site exposed yet unable to bind DNA because of steric and electrostatic clashes with incoming substrate. Although its mode of action is unorthodox, Im9 is a remarkably effective inhibitor since it folds within milliseconds and then associates with its target endonuclease at the rate of diffusion to form an inactive complex with sub-femtomolar binding affinity. This hyperefficient mechanism of inhibition could be well suited to other toxic enzyme systems, particularly where the substrate is a polymer extending beyond the boundaries of the active site.
About this StructureAbout this Structure
2GYK is a Protein complex structure of sequences from Escherichia coli. Full crystallographic information is available from OCA.
ReferenceReference
Structural and mechanistic basis of immunity toward endonuclease colicins., Kleanthous C, Kuhlmann UC, Pommer AJ, Ferguson N, Radford SE, Moore GR, James R, Hemmings AM, Nat Struct Biol. 1999 Mar;6(3):243-52. PMID:10074943
Page seeded by OCA on Mon Mar 31 03:23:01 2008