Charecterization of fusisdic acid mutattions

[Ahmet Arman]

I saw two fusidic acid resistant mutant strain in one article which did not 
mention where fusidic acid mutants aare located on elongation factor G. Is 
there anybody who charecterized  fusidic acid mutants?
How do you test whether or not fusidic acid and cold sensitive mutations are 
caused by single mutation or multiple mutations.

Thank you for your attention to my request