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)