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Default Symmetry and secondary structure of the replication terminator protein of Bacillus su

Symmetry and secondary structure of the replication terminator protein of Bacillus subtilis: sedimentation equilibrium and circular dichroic, infrared, and NMR spectroscopic studies.

Related Articles Symmetry and secondary structure of the replication terminator protein of Bacillus subtilis: sedimentation equilibrium and circular dichroic, infrared, and NMR spectroscopic studies.

Biochemistry. 1993 Sep 28;32(38):10216-23

Authors: Kralicek AV, Vesper NA, Ralston GB, Wake RG, King GF

We have used analytical ultracentrifugation in combination with a number of spectroscopic techniques to analyze the symmetry and secondary structure of the DNA-binding replication terminator protein (RTP) of Bacillus subtilis. Sedimentation equilibrium studies confirm that RTP is a dimer in solution under the conditions used for spectroscopic analysis, whereas the number of cross peaks displayed in 1H-15N HSQC NMR spectra of uniformly 15N-labeled RTP are consistent with the primary structure of the monomer. These two results in combination lead to the conclusion that RTP is a symmetric dimer in solution. Circular dichroic and Fourier-transform infrared spectra reveal, in contrast to the results obtained from a number of commonly used secondary structure prediction algorithms, that RTP contains 20-30% alpha-helical and 40-50% beta-sheet/beta-turn secondary structure and that the conformation of the protein remains unchanged over the pH range 5-8. It is proposed on the basis of protein folding-class prediction algorithms, in combination with various physical properties of RTP, that it belongs to the alpha + beta protein-folding class.

PMID: 8399149 [PubMed - indexed for MEDLINE]



Source: PubMed
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