Chains and Chain IDs: Difference between revisions
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==Chain IDs== | ==Chain IDs== | ||
In the [[atomic coordinate file]]s maintained by the [[wwPDB]] ([[PDB files]]), each polymer chain is given an ID, or chain "name". In the legacy [[Atomic_coordinate_file#PDB_Data_Format|PDB data format]], chain IDs are a single letter or numeral (A-Z, a-z, 0-9), which limits the number of chains to 62. In the newer [[Atomic_coordinate_file#mmCIF_Data_Format|mmCIF data format]] (also called PDBx), chain IDs can be [https://mmcif.wwpdb.org/docs/large-pdbx-examples/index.html up to 4 letters or numerals], so the number of chains in a single structure is essentially unlimited (>10 million chains/structure | In the [[atomic coordinate file]]s maintained by the [[wwPDB]] ([[PDB files]]), each polymer chain is given an ID, or chain "name". In the legacy [[Atomic_coordinate_file#PDB_Data_Format|PDB data format]], chain IDs are a single letter or numeral (A-Z, a-z, 0-9), which limits the number of chains to 62. In the newer [[Atomic_coordinate_file#mmCIF_Data_Format|mmCIF data format]] (also called PDBx), chain IDs can be [https://mmcif.wwpdb.org/docs/large-pdbx-examples/index.html up to 4 letters or numerals], so the number of chains in a single structure is essentially unlimited (>10 million chains/structure could be accommodated by 4-character chain IDs). | ||
===Carbohydrate and Non-Polymer Chain IDs=== | ===Carbohydrate and Non-Polymer Chain IDs=== | ||
