PDB identification code: Difference between revisions
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==Limited Number of 4-Character 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<ref>In April, 2013. according to Rachel Kramer Green of the RCSB in Rutgers, NJ, there were no plans to use PDB codes beginning with 0. However, in July, 2017, the WWPDB FAQ states "The four-letter PDB identifier currently consists of a number (0-9) followed by 3 letters or numbers.".</ref>. Thus, the ~ | 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<ref>In April, 2013. according to Rachel Kramer Green of the RCSB in Rutgers, NJ, there were no plans to use PDB codes beginning with 0. However, in July, 2017, the WWPDB FAQ states "The four-letter PDB identifier currently consists of a number (0-9) followed by 3 letters or numbers.".</ref>. Thus, the ~170,000 entries in mid 2017 (plus withdrawn and superceded entries) have used up nearly half of the available codes. By approximately 2024, 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. See plans for an expanded system in the following section. | ||
==Future Plans for Expanded PDB Codes== | ==Future Plans for Expanded PDB Codes== | ||
