Primary Citation of Related Structures: 3AFP, 3AFQ
PubMed Abstract:
The crystal structures of two forms of Mycobacterium leprae single-stranded DNA-binding protein (SSB) have been determined at 2.05 and 2.8 Å resolution. Comparison of these structures with the structures of other eubacterial SSBs indicates considerable v ...
The crystal structures of two forms of Mycobacterium leprae single-stranded DNA-binding protein (SSB) have been determined at 2.05 and 2.8 Å resolution. Comparison of these structures with the structures of other eubacterial SSBs indicates considerable variation in their quaternary association, although the DNA-binding domains in all of them exhibit the same OB-fold. This variation has no linear correlation with sequence variation, but could be related to variation in protein stability. Molecular-dynamics simulations have been carried out on tetrameric molecules derived from the two forms and the prototype Escherichia coli SSB and the individual subunits of both proteins. Together, the X-ray studies and molecular-dynamics simulations yield information on the relatively rigid and flexible regions of the molecule and on the effect of oligomerization on flexibility. The simulations provide insight into the changes in subunit structure on oligomerization. They also provide insight into the stability and time evolution of the hydrogen bonds/water bridges that connect the two pairs of monomers in the tetramer.
Related Citations:
Structure of Mycobacterium smegmatis single-stranded DNA-binding protein and a comparative study involving homologus SSBs: biological implications of structural plasticity and variability in quaternary association Saikrishnan, K., Manjunath, G.P., Singh, P., Jeyakanthan, J., Dauter, Z., Sekar, K., Muniyappa, K., Vijayan, M. (2005) Acta Crystallogr D Biol Crystallogr 61: 1140
Structure of Mycobacterium tuberculosis single-stranded DNA-binding protein. Variability in quaternary structure and its implications Saikrishnan, K., Jeyakanthan, J., Venkatesh, J., Acharya, N., Sekar, K., Varshney, U., Vijayan, M. (2003) J Mol Biol 331: 385
Crystal structure of human mitochondrial single-stranded DNA binding protein at 2.4 A resolution Yang, C., Curth, U., Urbanke, C., Kang, C. (1997) Nat Struct Biol 4: 153
Crystal structure of the homo-tetrameric DNA binding domain of Escherichia coli single-stranded DNA-binding protein determined by multiwavelength x-ray diffraction on the selenomethionyl protein at 2.9-A resolution Raghunathan, S., Ricard, C.S., Lohman, T.M., Waksman, G. (1997) Proc Natl Acad Sci U S A 94: 6652
Organizational Affiliation:
Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India.
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