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1fiu

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1fiu, resolution 1.60Å ()
Ligands: ,
Activity: Type II site-specific deoxyribonuclease, with EC number 3.1.21.4
Resources: FirstGlance, OCA, PDBsum, RCSB
Coordinates: save as pdb, mmCIF, xml



Contents

TETRAMERIC RESTRICTION ENDONUCLEASE NGOMIV IN COMPLEX WITH CLEAVED DNA

Publication Abstract from PubMed

The crystal structure of the NgoMIV restriction endonuclease in complex with cleaved DNA has been determined at 1.6 A resolution. The crystallographic asymmetric unit contains a protein tetramer and two DNA molecules cleaved at their recognition sites. This is the first structure of a tetrameric restriction enzyme-DNA complex. In the tetramer, two primary dimers are arranged back to back with two oligonucleotides bound in clefts on opposite sides of the tetramer. The DNA molecules retain a B-type conformation and have an enclosed angle between their helical axes of 60 degrees. Sequence-specific interactions occur in both the major and minor grooves. Two Mg2+ ions are located close to the cleaved phosphate at the active site of NgoMIV. Biochemical experiments show that interactions between the recognition sites within the tetramer greatly increase DNA cleavage efficiency.

Structure of the tetrameric restriction endonuclease NgoMIV in complex with cleaved DNA., Deibert M, Grazulis S, Sasnauskas G, Siksnys V, Huber R, Nat Struct Biol. 2000 Sep;7(9):792-9. PMID:10966652

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

About this Structure

1fiu is a 12 chain structure with sequence from Neisseria gonorrhoeae. Full crystallographic information is available from OCA.

See Also

Reference

  • Deibert M, Grazulis S, Sasnauskas G, Siksnys V, Huber R. Structure of the tetrameric restriction endonuclease NgoMIV in complex with cleaved DNA. Nat Struct Biol. 2000 Sep;7(9):792-9. PMID:10966652 doi:10.1038/79032

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