Chains and Chain IDs: Difference between revisions
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Single character IDs cover 26 chains. Double letter IDs cover 26<sup>2</sup>=676. Triple-letter IDs cover 26<sup>3</sup>=17,576. Four-letter IDs are also allowed, covering an additional 456,976 IDs. | Single character IDs cover 26 chains. Double letter IDs cover 26<sup>2</sup>=676. Triple-letter IDs cover 26<sup>3</sup>=17,576. Four-letter IDs are also allowed, covering an additional 456,976 IDs. | ||
When a biological unit has more chains than the asymmetric unit, the | When a biological unit has more chains than the asymmetric unit, the additional wwPDB-assigned chain IDs are added following the above order. In the examples below, the ratio of biological unit polymer chains to asymmetric unit polymer chains are: | ||
* 1hho 2x: 2 -> 4 polymer chains ("polymer chains" means protein or nucleic acid only). | * 1hho 2x: 2 -> 4 polymer chains ("polymer chains" means protein or nucleic acid only). | ||
* 1igt 1x: 4 -> 4 polymer chains. | * 1igt 1x: 4 -> 4 polymer chains. | ||
