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. Author manuscript; available in PMC: 2018 Mar 1.
Published in final edited form as: Photosynth Res. 2017 Jul 24;134(2):175–182. doi: 10.1007/s11120-017-0425-4

Figure 2.

Figure 2

Electron density for Chl a (c-631 in the 3ARC numbering, green) adjacent to the hydrophobic tail of PG (d-714, orange) identified in the 1.9 Å PSII crystal structure (PDB 3WU2). Electron density and fitting is shown: (A) from the originally reported 1.9 Å structure with Chl c-631 having a full length 20 carbon phytyl tail extending through unresolved space into adjacent electron density and (B) from the re-refined electron density map showing Chl c-631 with a 15 carbon farnesyl tail that is truncated when the electron density of the tail stops. The σA-weighted 2Fo-Fc electron density maps are contoured at 1.0σ (Dark Blue), and the σA-weighted Fo-Fc electron density map contoured at 3.0σ (A, green). Images were generated using COOT and PyMol.