Figure 9
Experimental electron-density map of trypsin calculated using anomalous differences to 3.5 Å and the SAD phases from the Ca2+, six S super-atoms and two S atoms. (a) The electron-density maps of the β-sheet (Gln50–Ser54, Ser84–Val90, Ile103–Lys109); (b) the electron-density map of residues Asp102–Lys107; (c) electron density of the helix (Tyr234–Asn245). Only main-chain atoms are displayed for (a) and (c). |