Document Detail

Dissection of the region of Pseudomonas aeruginosa ParA that is important for dimerization and interactions with its partner ParB.
MedLine Citation:
PMID:  25139949     Owner:  NLM     Status:  Publisher    
P. aeruginosa ParA belongs to a large subfamily of Walker-type ATPases acting as partitioning proteins in bacteria. ParA has the ability to both self-associate and interact with its partner ParB. Analysis of the deletion mutants defined the part of the protein involved in dimerization and interactions with ParB. Here, a set of the ParA alanine substitution mutants in the region between E67 and L85 was created and analyzed in vivo and in vitro. All mutants impaired in dimerization (substitutions at positions M74, H79, Y82, L84) were also defective in interactions with ParB suggesting that ParA-ParB interactions depend on the ability of ParA to dimerize. Mutants with alanine substitutions at positions E67, C68, L70, E72, F76, Q83 and L85 were not impaired in dimerization but defective in interactions with ParB. The dimerization interface partly overlaps the pseudo-hairpin, involved in interactions with ParB. ParA mutant derivatives tested in vitro showed no defects in ATPase activity. Two parA alleles, parA84, whose product can neither self-interact nor interact with ParB, and parA67, whose product is impaired in interactions with ParB but not in dimerization, were introduced into P. aeruginosa chromosome by homologous gene exchange. Both mutants showed defective separation of ParB foci but to different extents. Only PAO1161 parA84 was visibly impaired in chromosome segregation, growth rate and motilities similarly to a parAnull mutant.
Aneta A Bartosik; Krzysztof Glabski; Paulina Jecz; Krzysztof Lasocki; Malgorzata Mikosa; Danuta Plochocka; Christopher M Thomas; Grazyna T Jagura-Burdzy
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-8-19
Journal Detail:
Title:  Microbiology (Reading, England)     Volume:  -     ISSN:  1465-2080     ISO Abbreviation:  Microbiology (Reading, Engl.)     Publication Date:  2014 Aug 
Date Detail:
Created Date:  2014-8-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9430468     Medline TA:  Microbiology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2014, the Society for General Microbiology.
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