Mutations in a Helix-1 Motif of the ATP Synthase c-Subunit of Bacillus pseudofirmus OF4 Cause Functional Deficits and Changes in the c-Ring Stability and Mobility on Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis - Liu,J; Fackelmayer,OJ; Hicks,DB; Preiss,L; Meier,T; Sobie,EA; Krulwich,TA (BIOCHEMISTRY, 2011)