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DnaT is a replication restart primosomal protein required for re-initiating chromosomal DNA replication in bacteria. DnaT can be a monomer, dimer, trimer, tetramer, or pentamer. The oligomerization and disassembly of DnaT oligomers are critical in primosome assembly. Prior to this work, only the ssDNA-bound structure of the pentameric DnaT truncated protein (aa 84-153; DnaT84-153) was available. The mechanism by which DnaT oligomerizes as different states is unclear. In this paper, we report the crystal structure of the C-terminal domain of DnaT (aa 84-179; DnaTc) at 2.30 Å resolution (PDB entry 6AEQ). DnaTc forms a dimer both in the crystalline state and in solution. As compared with the ssDNA-bound structure of the pentameric DnaT84-153, their subunit-subunit interfaces significantly differ. The different oligomeric architecture suggests a strong conformational change possibly induced by ssDNA. Superposition analysis further indicated that the monomer of a DnaTc dimer shifted away by a distance of 7.5 Å and rotated by an angle of 170° for binding to ssDNA. Basing from these molecular evidence, we discussed and proposed a working model to explain how DnaTc oligomerizes through residue R146 mediation.
Pubmed ID: 30755302
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Software for macromolecular model building, model completion and validation, and protein modelling using X-ray data. Coot displays maps and models and allows model manipulations such as idealization, rigid-body fitting, ligand search, Ramachandran plots, non-crystallographic symmetry and more. Source code is available.
View all literature mentionsA Python-based software suite for the automated determination of molecular structures using X-ray crystallography and other methods. Phenix includes programs for assessing data quality, experimental phasing, molecular replacement, model building, structure refinement, and validation. It also includes tools for reflection data and creating maps and models. Phenix can also be used for neutron crystallography. Tutorials and examples are available in the documentation tab.
View all literature mentionsSoftware package for structural determination and other functions in the field of structural biology. Its programs can perform strategy and simulation, 3-D processing, mosaicity refinement during processing, variable spot size, easy change of the space group, report generation, and other functions.
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