Abstract:
:A modelling procedure has been utilized to obtain a preliminary three-dimensional structural model for the bacteriophage IKe DNA binding protein (IKe-DBP) based on the known high resolution X-ray diffraction structure of a functionally related protein (G5BP) from bacteriophage fd. The degree of structural homology observed is much higher than the 44% primary sequence identity between these proteins would indicate. These studies suggest IKe-DBP, like G5BP, is composed of a central three-stranded beta sheet from which protrude three extended beta loops. Furthermore, the IKe-DBP structural model can easily form, without conformational rearrangements, the compact dimer unit that is the functionally active species of G5BP. Structural comparisons show residues conserved in the primary sequence of both proteins tend to cluster in two regions. The first being essential for the maintenance of dimer association. The second about the two DNA binding channels which cross the face of each dimer. Based upon an earlier characterized G5BP-DNA complex, a model for DNA complexation to IKe-DBP is also presented.
journal_name
J Biomol Struct Dynjournal_title
Journal of biomolecular structure & dynamicsauthors
Brayer GDdoi
10.1080/07391102.1987.10507683subject
Has Abstractpub_date
1987-04-01 00:00:00pages
859-68issue
5eissn
0739-1102issn
1538-0254journal_volume
4pub_type
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