Figure 2From: Engineering of an E. coli outer membrane protein FhuA with increased channel diameterComparison of FhuA Δ1-159 and FhuA Δ1-159 Exp channel diameter. FhuA Δ1-159 is represented as a docosagon and FhuA Δ1-159 Exp as a tetracosagon. The side length is constrained due to the constrained hydrogen bond length. Increasing the number of β-strands from 22 (FhuA Δ1-159) to 24 (FhuA Δ1-159 Exp) leads to an increased diameter, as indicated (Δ d).Back to article page