P
DB_EXTRACT is a program suite developed by the RCSB that contains tools and examples for extracting mmCIF data from structure determination applications. It has been integrated with the CCP4i interface of the CCP4 program suite for protein crystallography (version 5.0).

PDB_EXTRACT is also available for download (both source and executable) from deposit.pdb.org/mmcif/PDB_EXTRACT/index.html.

PDB_EXTRACT extracts information about data processing, heavy atom phasing, molecular replacement, density modification, and final structure refinement from the output files produced by many X-ray crystallographic applications. The program merges these data into macromolecular Crystallographic Information File (mmCIF) data files that can be used with ADIT to perform validation and to add any additional information for PDB deposition. PDB_EXTRACT can also be used online at pdb-extract.rutgers.edu.

PDB DEPOSITION STATISTICS

I
n the first half of 2004, approximately 2726 structures were deposited in the PDB archive. Of the structures received, 79% were deposited with a "hold until publication" release status; 13% with a "release immediately" status; and 8% with a specific release date.

83% of these entries were the result of X-ray crystallographic experiments; 14% were determined by NMR methods.