کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2188342 | 1096163 | 2007 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: An Asymmetric Structure of the Bacillus subtilis Replication Terminator Protein in Complex with DNA An Asymmetric Structure of the Bacillus subtilis Replication Terminator Protein in Complex with DNA](/preview/png/2188342.png)
In Bacillus subtilis, the termination of DNA replication via polar fork arrest is effected by a specific protein:DNA complex formed between the replication terminator protein (RTP) and DNA terminator sites. We report the crystal structure of a replication terminator protein homologue (RTP.C110S) of B. subtilis in complex with the high affinity component of one of its cognate DNA termination sites, known as the TerI B-site, refined at 2.5 Å resolution. The 21 bp RTP:DNA complex displays marked structural asymmetry in both the homodimeric protein and the DNA. This is in contrast to the previously reported complex formed with a symmetrical TerI B-site homologue. The induced asymmetry is consistent with the complex's solution properties as determined using NMR spectroscopy. Concomitant with this asymmetry is variation in the protein:DNA binding pattern for each of the subunits of the RTP homodimer. It is proposed that the asymmetric “wing” positions, as well as other asymmetrical features of the RTP:DNA complex, are critical for the cooperative binding that underlies the mechanism of polar fork arrest at the complete terminator site.
Journal: Journal of Molecular Biology - Volume 370, Issue 3, 13 July 2007, Pages 481–491