1tbx

From Proteopedia

Revision as of 01:01, 21 November 2007

Crystal structure of SSV1 F-93

Overview

Sulfolobus spindle-shaped viruses (SSVs), or Fuselloviridae, are, ubiquitous crenarchaeal viruses found in high-temperature acidic hot, springs around the world (pH </=4.0; temperature of >/=70 degrees C)., Because they are relatively easy to isolate, they represent the best, studied of the crenarchaeal viruses. This is particularly true for the, type virus, SSV1, which contains a double-stranded DNA genome of 15.5, kilobases, encoding 34 putative open reading frames. Interestingly, the, genome shows little sequence similarity to organisms other than its SSV, homologues. Together, sequence similarity and biochemical analyses have, suggested functions for only 6 of the 34 open reading frames. Thus, even, though SSV1 is the best-studied crenarchaeal virus, functions for most, (28) of its open reading frames remain unknown. We have undertaken, biochemical and structural studies for the gene product of open reading, frame F-93. We find that F-93 exists as a homodimer in solution and that a, tight dimer is also present in the 2.7-A crystal structure. Further, the, crystal structure reveals a fold that is homologous to the SlyA and MarR, subfamilies of winged-helix DNA binding proteins. This strongly suggests, that F-93 functions as a transcription factor that recognizes a, (pseudo-)palindromic DNA target sequence.

About this Structure

1TBX is a Single protein structure of sequence from Sulfolobus virus 1. Full crystallographic information is available from OCA.

Reference

Crystal structure of F-93 from Sulfolobus spindle-shaped virus 1, a winged-helix DNA binding protein., Kraft P, Oeckinghaus A, Kummel D, Gauss GH, Gilmore J, Wiedenheft B, Young M, Lawrence CM, J Virol. 2004 Nov;78(21):11544-50. PMID:15479795

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