Table 1.

Phenotypic characterization of the mamAB mutants

MutantMagnetic response (Cmag)Presence of magnetosome membranes
ΔmamUWt+
ΔmamVWt+
ΔmamHIntermediate+
ΔmamQIntermediate+
ΔmamRIntermediate+
ΔmamBIntermediate+
ΔmamPWeak+
ΔR9ΔmamRWeak+
ΔmamSWeak+
ΔmamTWeak+
ΔmamENull+
ΔmamMNull+
ΔmamNNull+
ΔmamONull+
ΔmamINull
ΔmamLNull
ΔR9ΔmamQNull
ΔR9ΔmamBNull
  • Intermediate, 60–80% of wild-type magnetic response; Weak, less than 40% of wild-type magnetic response; Wt, not significantly different from the wild type. Presence of magnetosome membranes was assessed by cryo-ultramicrotomy and TEM.