کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10536719 | 962591 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The 1.59Â Ã
resolution structure of the minor pseudopilin EpsH of Vibrio cholerae reveals a long flexible loop
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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![عکس صفحه اول مقاله: The 1.59Â Ã
resolution structure of the minor pseudopilin EpsH of Vibrio cholerae reveals a long flexible loop The 1.59Â Ã
resolution structure of the minor pseudopilin EpsH of Vibrio cholerae reveals a long flexible loop](/preview/png/10536719.png)
چکیده انگلیسی
The type II secretion complex exports folded proteins from the periplasm to the extracellular milieu. It is used by the pathogenic bacterium Vibrio cholerae to export several proteins, including its major virulence factor, cholera toxin. The pseudopilus is an essential component of the type II secretion system and likely acts as a piston to push the folded proteins across the outer membrane through the secretin pore. The pseudopilus is composed of the major pseudopilin, EpsG, and four minor pseudopilins, EpsH, EpsI, EpsJ and EpsK. We determined the x-ray crystal structure of the head domain of EpsH at 1.59Â Ã
resolution using molecular replacement with the previously reported EpsH structure, 2qv8, as the template. Three additional N-terminal amino acids present in our construct prevent an artifactual conformation of residues 160-166, present in one of the two monomers of the 2qv8 structure. Additional crystal contacts stabilize a long flexible loop comprised of residues 104-135 that is more disordered in the 2qv8 structure but is partially observed in our structure in very different positions for the two EpsH monomers in the asymmetric unit. In one of the conformations the loop is highly extended. Modeling suggests the highly charged loop is capable of contacting EpsG and possibly secreted protein substrates, suggesting a role in specificity of pseudopilus assembly or secretion function.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics - Volume 1844, Issue 2, February 2014, Pages 406-415
Journal: Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics - Volume 1844, Issue 2, February 2014, Pages 406-415
نویسندگان
Kannan Raghunathan, Frank S. Vago, David Grindem, Terry Ball, William J. Wedemeyer, Michael Bagdasarian, Dennis N. Arvidson,