OMEGA - A 3-DIMENSIONAL DATA-BANK FOR PROTEIN STRUCTURES (A COMPLEMENT TO PDB)

OMEGA is a compilation of recent structural information on proteins de rived from X-ray crystallography or NMR and published in journals refe renced by Current Contents. To date, 401 entries have been included (3 34 X-ray, 28 MMR, 5 NMR + X-ray, 5 electron microscopy, 3 neutron scat tering, 2 neutron diffraction, 1 electron microscopy + X-ray, 12 model , 11 miscellaneous), with 5-10 new proteins being added each week. OME GA can be accessed on Macintosh and is interrogated through 32 key wor ds (space group, resolution, secondary structure, number of residues, etc). This pool of proteins could be used for various purposes, includ ing searches for proteins with a particular set of secondary structure s. OMEGA will be continuously updated (every 6 months) and may later i nclude all proteins already reported in the PDB, as well as structures reported in journals with smaller readerships.