3aam

Crystal structure of endonuclease IV from Thermus thermophilus HB8

spinqualitylabelsall models 3aam, resolution 1.58Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3aam is a 1 chain structure with sequence from Thermus thermophilus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MN, PO4 Related: 3aal Gene: TTHA0834 (Thermus thermophilus) Activity: Deoxyribonuclease IV (phage-T(4)-induced), with EC number 3.1.21.2 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Endonuclease IV (EndoIV) is an endonuclease that acts at apurinic/apyrimidinic (AP) sites and is classified as either long-type or short-type. The crystal structures of representative types of EndoIV from Geobacillus kaustophilus and Thermus thermophilus HB8 were determined using X-ray crystallography. G. kaustophilus EndoIV (the long type) had a higher affinity for double-stranded DNA containing an AP-site analogue than T. thermophilus EndoIV (the short type). Structural analysis of the two different EndoIVs suggested that a C-terminal DNA-recognition loop that is only present in the long type contributes to its high affinity for AP sites. A mutation analysis showed that Lys267 in the C-terminal DNA-recognition loop plays an important role in DNA binding. An additional C-terminal loop in endonuclease IV, an apurinic/apyrimidinic endonuclease, controls binding affinity to DNA.,Asano R, Ishikawa H, Nakane S, Nakagawa N, Kuramitsu S, Masui R Acta Crystallogr D Biol Crystallogr. 2011 Mar;67(Pt 3):149-55. Epub 2011, Feb 15. PMID:21358045 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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