PDB identification code: Difference between revisions
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Once a PDB code is assigned to a given structure, it's forever, even in those cases when a structure is withdrawn (retired from the database), like [[3luw]], or superceded by a newer or corrected structure, like [[1ace]]. If requesting a page for a superseded structure, like [[1aak]], Proteopedia will automatically display the newest structure [[2aak]]. Look for the explanation in the 'About this Structure' section of each page. | Once a PDB code is assigned to a given structure, it's forever, even in those cases when a structure is withdrawn (retired from the database), like [[3luw]], or superceded by a newer or corrected structure, like [[1ace]]. If requesting a page for a superseded structure, like [[1aak]], Proteopedia will automatically display the newest structure [[2aak]]. Look for the explanation in the 'About this Structure' section of each page. | ||
==Limited Number of PDB Codes== | ==Limited Number of 4-Character PDB Codes== | ||
There are 419,904 possible 4-character PDB identification codes<ref>Ten numerals plus 26 letters = 36. The first character is 1-9. (9)(36<sup>3</sup>) = 419,904.</ref>. This could be increased to 466,560 if the numeral "0" is allowed as the first character, but so far there are no plans to do this<ref>In April, 2013. according to Rachel Kramer Green of the RCSB in Rutgers, NJ, there are no plans to use PDB codes beginning with 0.</ref>, Thus, the ~107,000 entries in early 2015 have used up ~25% of the available codes. Someday a scheme that can accommodate more entries will be required, requiring revision of macromolecular visualization and modeling software programs that obtain data online, all of which, of necessity, currently require 4-character PDB codes. | There are 419,904 possible 4-character PDB identification codes<ref>Ten numerals plus 26 letters = 36. The first character is 1-9. (9)(36<sup>3</sup>) = 419,904.</ref>. This could be increased to 466,560 if the numeral "0" is allowed as the first character, but so far there are no plans to do this<ref>In April, 2013. according to Rachel Kramer Green of the RCSB in Rutgers, NJ, there are no plans to use PDB codes beginning with 0.</ref>, Thus, the ~107,000 entries in early 2015 have used up ~25% of the available codes. Someday a scheme that can accommodate more entries will be required, requiring revision of macromolecular visualization and modeling software programs that obtain data online, all of which, of necessity, currently require 4-character PDB codes. | ||
==Future Plans for Expanded PDB Codes== | |||
In May, 2017, the [[Protein Data Bank]] announced plans to introduce, later in 2017, an expanded PDB accession code with versioning<ref>PDB News May 17, 2017: [https://www.wwpdb.org/news/news?year=2017#5910c8d8d3b1d333029d4ea8 Revise Your Structure Without Changing the PDB Accession Code and Related Changes to the FTP Archive].</ref>. | |||
==See Also== | ==See Also== | ||