From the NCBI home page, click on the Domains & Structures category on the left side of the page.
Click on Structure under Databases.
Click on the Preview/Index tab near the top of the page to view the list of available fields.
All Entrez queries contain terms limited by fields and joined by Boolean operators, such as this query that retrieves all human 3D structures with exactly one protein chain: human[organism] AND 1[proteinchaincount]
Find all protein structures from primates. Use the fields [Organism] and [ProteinChainCount].
Add a term to your search to find all structures of protein-DNA complexes from primates containing only
double-stranded DNA. Use the field [DnaChainCount].
Find all structures determined by x-ray diffraction from Archaea at resolutions less than 2.0 Angstroms. Use the ":" range operator as follows: 0.0:2.0[resolution].
Use the [Filter] field to limit the results to those structures linked to SNP records, indicating that they are a structural model for a known SNP. Using
Index in Preview/Index, look for terms in the [Filter] field such as "structure abc", which find links
between structure and database abc.