search results
results of search on CRYSTALLOGRAPHY JOURNALS ONLINE
2 citations found for Demasi, D.
Search for Demasi, D. in the World Directory of Crystallographers
Results 1 to 2, sorted by name:
![d logo](https://journals.iucr.org/logos/jicons/d_36x36.png)
The crystal structure of bovine seminal ribonuclease, a homodimeric enzyme closely related to pancreatic ribonuclease, has been refined at a nominal resolution of 1.9 Å employing data collected on an electronic area detector. The final model consists of two chains containing 1990 non-H atoms, seven sulfate anions and 113 water molecules per asymmetric unit. The unit-cell parameters are a = 36.5 (1), b = 66.7 (1) and c = 107.5 (2) Å, space group P22121. The R factor is 0.177 for 16 492 reflections in the resolution range 6.0-1.9 Å and the deviations from ideal values of bond lengths and bond angles are 0.020 Å and 3.7°, respectively. The molecule is formed by two pancreatic like chains, which have their N-terminal segments interchanged so that each active site is formed by residues from both subunits. The two chains are related by a non-crystallographic twofold symmetry and are covalently linked by two consecutive disulfide bridges, which form an unusual sixteen-membered ring across the dimer interface. The deviations from the molecular symmetry, the hydration shell and the sulfate-binding sites are also discussed in relation to the known structure of the pancreatic enzyme.
![d logo](https://journals.iucr.org/logos/jicons/d_36x36.png)
Elimination of twinning by growth in agarose gels is described.