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Binding mode analysis of a major T3SS translocator protein PopB with its chaperone PcrH from Pseudomonas aeruginosa

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Title Binding mode analysis of a major T3SS translocator protein PopB with its chaperone PcrH from Pseudomonas aeruginosa
 
Creator Banerjee, Anindyajit
Dey, Supratim
Chakraborty, Abhijit
Datta, Aohona
Basu, Abhishek
Saikat , Saikat
Datta, Saumen
 
Subject Chemistry
 
Description Pseudomonas aeruginosa, a Gram-negative pathogen uses a specialized set of Type III secretion system (T3SS) translocator proteins to establish virulence in the host cell. An understanding of the factors that govern translocation by the translocator protein–chaperone complex is thus of immense importance. In this work, experimental and computational techniques were used to probe into the structure of the major translocator protein PopB from P. aeruginosa and to identify the important regions involved in functioning of the translocator protein. This study reveals that the binding sites of the common chaperone
PcrH, needed for maintenance of the translocator PopB within the bacterial cytoplasm, which are primarily localized within the N-terminal domain. However, disordered and flexible residues located both at the N- and C-terminal domains are also observed to be involved in association with the chaperone. This intrinsic disorderliness of the terminal domains is conserved for all the major T3SS translocator proteins and is functionally important to maintain the intrinsically disordered state of the translocators. Our experimental and computational analyses suggest that a “disorder-to-order” transition of PopB protein might take place upon PcrH binding. The long helical coiled-coil part of PopB protein perhaps helps in pore formation while the flexible apical region is involved in chaperone interaction. Thus, our computational model of translocator protein PopB and its binding analyses provide crucial functional insights into the T3SS translocation mechanism.
 
Publisher John Wiley & Sons
 
Date 2014
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://www.eprints.iicb.res.in/2162/1/PROTEINS%2DSTRUCTURE_FUNCTION_AND_BIOINFORMATICS___82(12_)_3273%2D3285;2014.pdf
Banerjee, Anindyajit and Dey, Supratim and Chakraborty, Abhijit and Datta, Aohona and Basu, Abhishek and Saikat , Saikat and Datta, Saumen (2014) Binding mode analysis of a major T3SS translocator protein PopB with its chaperone PcrH from Pseudomonas aeruginosa. "Proteins: Structure, Function, and Bioinformatics", 82 (12). pp. 3273-3285. ISSN 0887-3585
 
Relation http://dx.doi.org/10.1002/prot.24666
http://www.eprints.iicb.res.in/2162/