# RCSB PDB Sequence Coordinates API

**Canonical:** https://apis.io/apis/pdb/rcsb-pdb-sequence-coordinates-api/  
**Provider:** RCSB PDB — https://apis.io/providers/pdb/  
**Base URL:** https://sequence-coordinates.rcsb.org/graphql  
**Documentation:** https://sequence-coordinates.rcsb.org

RCSB PDB Sequence Coordinates API is one of 7 APIs that [RCSB PDB](https://apis.io/providers/pdb/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Sequence Alignment, UniProt, NCBI, GraphQL, and Annotations. The published artifact set on APIs.io includes API documentation.

GraphQL service providing sequence-level alignments between structural databases and external sequence resources. Exposes two core queries — alignment and annotations — enabling callers to map PDB chain positions to UniProt, NCBI RefSeq (protein and genomic), CATH, SCOPe, and Computed Structure Models (CSMs). Replaces the legacy 1D Coordinates Service.

## Machine-readable artifacts (2)

- **Documentation** — https://sequence-coordinates.rcsb.org
- **GraphQLExplorer** — https://sequence-coordinates.rcsb.org/graphiql/index.html

## Other RCSB PDB APIs (6)

- [RCSB PDB Data API](https://apis.io/apis/pdb/rcsb-pdb-data-api/)
- [RCSB PDB Structure Alignment API](https://apis.io/apis/pdb/rcsb-pdb-alignment-api/)
- [RCSB PDB General API](https://apis.io/apis/pdb/pdb-general-api/)
- [RCSB PDB Metadata Service API](https://apis.io/apis/pdb/pdb-metadata-service-api/)
- [RCSB PDB Search Service API](https://apis.io/apis/pdb/pdb-search-service-api/)
- [RCSB PDB Suggest Service API](https://apis.io/apis/pdb/pdb-suggest-service-api/)

## Tags

Sequence Alignment, UniProt, NCBI, GraphQL, Annotations

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/pdb/rcsb-pdb-sequence-coordinates-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/pdb/.