Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-24680
Pogoryelov, D; Reichen, C; Klyszejko, A L; Brunisholz, R; Muller, D J; Dimroth, P; Meier, T (2007). The oligomeric state of c rings from cyanobacterial F-ATP synthases varies from 13 to 15. Journal of Bacteriology, 189(16):5895-902.
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We isolated the c rings of F-ATP synthases from eight cyanobacterial strains belonging to four different taxonomic classes (Chroococcales, Nostocales, Oscillatoriales, and Gloeobacteria). These c rings showed different mobilities on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), probably reflecting their molecular masses. This supposition was validated with the previously characterized c(11), c(14), and c(15) rings, which migrated on SDS-PAGE in proportion to their molecular masses. Hence, the masses of the cyanobacterial c rings can conveniently be deduced from their electrophoretic mobilities and, together with the masses of the c monomers, allow the calculation of the c ring stoichiometries. The method is a simple and fast way to determine stoichiometries of SDS-stable c rings and hence a convenient means to unambiguously determine the ion-to-ATP ratio, a parameter reflecting the bioenergetic efficacy of F-ATP synthases. AFM imaging was used to prove the accuracy of the method and confirmed that the c ring of Synechococcus elongatus SAG 89.79 is a tridecameric oligomer. Despite the high conservation of the c-subunit sequences from cyanobacterial strains from various environmental groups, the stoichiometries of their c rings varied between c(13) and c(15). This systematic study of the c-ring stoichiometries suggests that variability of c-ring sizes might represent an adaptation of the individual cyanobacterial species to their particular environmental and physiological conditions. Furthermore, the two new examples of c(15) rings underline once more that an F(1)/F(o) symmetry mismatch is not an obligatory feature of all F-ATP synthases.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > Functional Genomics Center Zurich|
08 University Research Priority Programs > Systems Biology / Functional Genomics
|DDC:||570 Life sciences; biology|
610 Medicine & health
|Deposited On:||28 Dec 2009 06:47|
|Last Modified:||23 Nov 2012 16:48|
|Publisher:||American Society for Microbiology|
|Free access at:||Publisher DOI. An embargo period may apply.|
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