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Figure 3
Electron density around the N-terminal PCA in recombinant TaXyn10, calculated after final refinement of the model. (a) Shown are the 2mFo − DFc electron-density maps (blue mesh) contoured at 1.0σ and the mFo − DFc difference electron-density maps (green and red mesh) contoured at 3.0σ around the N-terminal residue modelled as Gln. (b) 2mFo − DFc electron-density maps (blue mesh) contoured at 1.0σ and mFo − DFc difference electron-density maps (green and red mesh) contoured at 3.0σ around the N-terminal residue modelled as PCA. (c) TaXyn10 shown as a cartoon, coloured by B factor with blue representing the minimum and red representing the maximum B factor for the protein chain. The four N-terminal residues, including PCA2, are shown in ball-and-stick representation. Symmetry mates are shown as grey cartoons. (d) 2mFo − DFc composite omit electron-density map (blue mesh) contoured at 0.7σ around the N-terminal PCA.

Journal logoSTRUCTURAL BIOLOGY
COMMUNICATIONS
ISSN: 2053-230X
Volume 82| Part 10| October 2026| Pages 329-335
https://doi.org/10.1107/S2053230X26009155