Biological Unit: Difference between revisions
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===REMARK 350 in the PDB File Header=== | ===REMARK 350 in the PDB File Header=== | ||
Atomic coordinates for biological units, when specified by the authors of a published structure in REMARK 350 of the [[PDB file format]], 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). | Atomic coordinates for biological units, when specified by the authors of a published structure in REMARK 350 of the [[PDB file format]], 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 the files from RCSB is that when they contain more than one copy of the asymmetric unit, the chains all have identical names. | ||
Sometimes, the specific oligomers were not known at the time the asymmetric unit was published. Also, some authors failed to specify the biological unit even when it was known. Rarely, the specified biological units might be incorrect. For all these reasons, it is advisable to consult sources other than REMARK 350. | Sometimes, the specific oligomers were not known at the time the asymmetric unit was published. Also, some authors failed to specify the biological unit even when it was known. Rarely, the specified biological units might be incorrect. For all these reasons, it is advisable to consult sources other than REMARK 350. | ||
===Probable Quaternary Structure Server (PQS)=== | ===Probable Quaternary Structure Server (PQS)=== | ||
