TY  - JOUR
AU  - Boer, D. Roeland
AU  - Ruiz-Masó, José Angel
AU  - Rueda, Manuel
AU  - Petoukhov, Maxim
AU  - Machón, Cristina
AU  - Svergun, Dmitri I.
AU  - Orozco, Modesto
AU  - del Solar, Gloria
AU  - Coll, Miquel
TI  - Conformational plasticity of RepB, the replication initiator protein of promiscuous streptococcal plasmid pMV158
JO  - Scientific reports
VL  - 6
SN  - 2045-2322
CY  - London
PB  - Springer Nature
M1  - PUBDB-2017-00354
SP  - 20915 
PY  - 2016
AB  - DNA replication initiation is a vital and tightly regulated step in all replicons and requires an initiator factor that specifically recognizes the DNA replication origin and starts replication. RepB from the promiscuous streptococcal plasmid pMV158 is a hexameric ring protein evolutionary related to viral initiators. Here we explore the conformational plasticity of the RepB hexamer by i) SAXS, ii) sedimentation experiments, iii) molecular simulations and iv) X-ray crystallography. Combining these techniques, we derive an estimate of the conformational ensemble in solution showing that the C-terminal oligomerisation domains of the protein form a rigid cylindrical scaffold to which the N-terminal DNA-binding/catalytic domains are attached as highly flexible appendages, featuring multiple orientations. In addition, we show that the hinge region connecting both domains plays a pivotal role in the observed plasticity. Sequence comparisons and a literature survey show that this hinge region could exists in other initiators, suggesting that it is a common, crucial structural element for DNA binding and manipulation.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000370055100001
C6  - pmid:26875695
DO  - DOI:10.1038/srep20915
UR  - https://bib-pubdb1.desy.de/record/316984
ER  -