Biophysical Characterization of Chlamydia trachomatis CT584 Supports Its Potential Role as a Type III Secretion Needle Tip Protein
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Issue Date
2009-11Author
Markham, Aaron P.
Jaafar, Zane A.
Kemege, Kyle Evan
Middaugh, C. Russell
Hefty, P. Scott
Publisher
American Chemical Society
Type
Article
Article Version
Scholarly/refereed, author accepted manuscript
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Show full item recordAbstract
Chlamydia are obligate intracellular bacterial pathogens that cause a variety of diseases. Likemany Gram-negative bacteria, they employ type III secretion systems (T3SS) for invasion, establishing and maintaining their unique intracellular niche, and possibly cellular exit. Computational structure prediction indicated that ORF CT584 is homologous to other T3SS needle tip proteins. Tip proteins have been shown to be localized to the extracellular end of the T3SS needle and play a key role in controlling secretion of effector proteins. We have previously demonstrated that T3SS needle tip proteins from different bacteria share many biophysical characteristics. To support the hypothesis that CT584 is a T3SS needle tip protein, biophysical properties of CT584 were explored as a function of pH and temperature, using spectroscopic techniques. Far-UV circular dichroism, Fourier transform infrared spectroscopy, UV absorbance spectroscopy, ANS extrinsic fluorescence, turbidity, right angle static light scattering, and analytical ultracentrifugation were all employed to monitor the secondary, tertiary, quaternary, and aggregation behavior of this protein. An empirical phase diagram approach is also employed to facilitate such comparisons. These analyses demonstrate that CT584 shares many biophysical characteristics with other T3SS needle tip proteins. These data support the hypothesis that CT584 is a member of the same functional family, although future biologic analyses are required.
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This is the published version. Copyright American Chemical Society
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Citation
Markham, Aaron P. et, al. "Biophysical Characterization of Chlamydia trachomatis CT584 Supports Its Potential Role as a Type III Secretion Needle Tip Protein." Biochemistry. 2009 Nov 3; 48(43): 10353–10361.
http://dx.doi.org/ 10.1021/bi901200y
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