Biological Unit: Difference between revisions
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Atomic coordinates for biological units, when specified by the authors of a published structure, are available from the [[Protein Data Bank]]. When this was written (April, 2008), biological units were available at the bottom of the list under the ''Download Files'' section, under the ''Structure'' tab (upper left of the page). One technical problem with these files is that when they contain more than one copy of the asymmetric unit, the chains all have identical names. | Atomic coordinates for biological units, when specified by the authors of a published structure, are available from the [[Protein Data Bank]]. When this was written (April, 2008), biological units were available at the bottom of the list under the ''Download Files'' section, under the ''Structure'' tab (upper left of the page). One technical problem with these files is that when they contain more than one copy of the asymmetric unit, the chains all have identical names. | ||
===Probable Quaternary Structure=== | ===Probable Quaternary Structure Server (PQS)=== | ||
The [http://pqs.ebi.ac.uk Probable Quaternary Structure Server]] (PQS) at the European Bioinformatics Institute examines the contacts within protein crystals, and makes an educated guess about which represent co-evolved specific oligomeric contacts, and which are artifacts of crystallization. It returns models for what it deduces to be the biological units. There are many possible relationships between the asymmetric unit and the biological units returned by PQS. Examples are given in the discussion of [http://proteinexplorer.org/pqs.htm PQS at ProteinExplorer.Org]. | |||
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==Web Sites== | ==Web Sites== | ||
