Download MendeleyMetal binding to porcine pancreatic elastase: calcium or not calcium.
Weiss, M.S., Panjikar, S., Nowak, E., Tucker, P.A.(2002) Acta Crystallogr D Biol Crystallogr 58: 1407-1412
- PubMed: 12198296
- DOI: https://doi.org/10.1107/S0907444902010934
- Primary Citation of Related Structures:
1LKA, 1LKB - PubMed Abstract:
Porcine pancreatic elastase has been crystallized at slightly acidic pH under two similar but slightly different conditions. Diffraction data were collected at a wavelength of 1.5 A to a maximum resolution of 1.7 A. Both difference electron-density maps and anomalous difference electron-density maps suggest that in crystals grown from a sodium sulfate solution PPE binds Na(+) in its metal-binding site. In contrast, PPE binds Ca(2+) in crystals grown from a solution containing sodium citrate and calcium chloride. This observation is in contradiction to most PPE structures reported in the PDB. In addition to the metal-binding site, up to three other binding sites, which appear to be anion-binding sites, could be identified based on the observed anomalous intensity differences.
Organizational Affiliation:
EMBL Hamburg Outstation, c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany. msweiss@embl-hamburg.de
