View source for 2gig

[[Image:2gig.gif|left|200px]]<br /><applet load="2gig" size="350" color="white" frame="true" align="right" spinBox="true" 
caption="2gig, resolution 1.83&Aring;" />
'''Alteration of sequence specificity of the type II restriction endonuclease HINCII through an indirect readout mechanism'''<br />

==Overview==
The functional and structural consequences of a mutation of the DNA intercalating residue of HincII, Q138F, are presented. Modeling has suggested that the DNA intercalation by Gln-138 results in DNA distortions potentially used by HincII in indirect readout of its cognate DNA, GTYRAC (Y = C or T, R = A or G) (Horton, N. C., Dorner, L. F., and Perona, J. J. (2002) Nat. Struct. Biol. 9, 42-47). Kinetic data presented here indicate that the mutation of glutamine 138 to phenylalanine (Q138F) results in a change in sequence specificity at the center two base pairs of the cognate recognition site. We show that the preference of HincII for cutting, but not binding, the three cognate sites differing in the center two base pairs has been altered by the mutation Q138F. Five new crystal structures are presented including Q138F HincII bound to GTTAAC and GTCGAC both with and without Ca2+ as well as the structure of wild type HincII bound to GTTAAC. The Q138F HincII/DNA structures show conformational changes in the protein, bound DNA, and at the protein-DNA interface, consistent with the formation of adaptive complexes. Analysis of these structures and the effect of Ca2+ binding on the protein-DNA interface illuminates the origin of the altered specificity by the mutation Q138F in the HincII enzyme.

==About this Structure==
2GIG is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Haemophilus_influenzae Haemophilus influenzae] with <scene name='pdbligand=NA:'>NA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Type_II_site-specific_deoxyribonuclease Type II site-specific deoxyribonuclease], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.21.4 3.1.21.4] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GIG OCA]. 

==Reference==
Alteration of sequence specificity of the type II restriction endonuclease HincII through an indirect readout mechanism., Joshi HK, Etzkorn C, Chatwell L, Bitinaite J, Horton NC, J Biol Chem. 2006 Aug 18;281(33):23852-69. Epub 2006 May 4. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16675462 16675462]
[[Category: Haemophilus influenzae]]
[[Category: Single protein]]
[[Category: Type II site-specific deoxyribonuclease]]
[[Category: Bitinaite, J.]]
[[Category: Chatwell, L.]]
[[Category: Etzkorn, C.]]
[[Category: Horton, N C.]]
[[Category: Joshi, H K.]]
[[Category: NA]]
[[Category: dna intercalation]]
[[Category: endonuclease]]
[[Category: indirect readout]]
[[Category: protein dna complex]]

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