Uniprot Protein Database Skill for Cursor

Query UniProt REST API: search by gene/protein name, fetch FASTA, map IDs (Ensembl, PDB, RefSeq), access Swiss-Prot annotations. Use bioservices for multi-DB access; alphafold-database-access for structures.

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Install

one command, takes just this skill from the repository

npx skills add https://github.com/jaechang-hits/SciAgent-Skills --skill uniprot-protein-database

The instruction itself

21 sections, as written by the author

UniProt — Protein Database

Overview

UniProt is the most comprehensive protein sequence and functional annotation database, containing 250M+ entries. This skill covers programmatic access via the UniProt REST API for protein search, sequence retrieval, ID mapping, and annotation queries. Swiss-Prot entries are manually curated; TrEMBL entries are computationally predicted.

When to Use

Searching for proteins by gene name, accession, organism, or function keywords
Retrieving protein sequences in FASTA format for downstream analysis
Mapping identifiers between databases (UniProt ↔ Ensembl, PDB, RefSeq, KEGG)
Accessing protein annotations: GO terms, domains, post-translational modifications
Batch retrieving multiple protein entries for comparative analysis
Downloading reviewed (Swiss-Prot) protein datasets for a specific organism
For unified access to 40+ databases, use bioservices instead
For protein 3D structures, use alphafold-database-access or pdb-database

Prerequisites

pip install requests pandas

API Rate Limits: UniProt REST API has no strict rate limit but recommends adding time.sleep(0.5) between batch requests. For large queries (>10k results), use the streaming endpoint instead of paginated search. Maximum 100,000 IDs per ID mapping job.

Quick Start

import requests

# Search for human insulin proteins (reviewed/Swiss-Prot only)
url = "https://rest.uniprot.org/uniprotkb/search"
params = {"query": "insulin AND organism_id:9606 AND reviewed:true", "format": "tsv",
          "fields": "accession,gene_names,protein_name,length"}
response = requests.get(url, params=params)
print(response.text[:500])
# accession  gene_names  protein_name  length
# P01308     INS         Insulin       110

Core API

1. Protein Search

Search UniProt with structured queries combining Boolean operators and field-specific filters.

import requests
import time

BASE = "https://rest.uniprot.org/uniprotkb/search"

def search_uniprot(query, fields=None, format="json", size=25):
    """Search UniProt with query syntax."""
    params = {"query": query, "format": format, "size": size}
    if fields:
        params["fields"] = ",".join(fields)
    resp = requests.get(BASE, params=params)
    resp.raise_for_status()
    return resp.json() if format == "json" else resp.text

# Search by gene name
results = search_uniprot("gene:BRCA1 AND reviewed:true",
                         fields=["accession", "gene_names", "organism_name", "length"])
for entry in results["results"][:3]:
    print(f"{entry['primaryAccession']} | {entry.get('genes', [{}])[0].get('geneName', {}).get('value', 'N/A')} | {entry.get('organism', {}).get('scientificName', 'N/A')}")

Query syntax reference:

# Boolean operators
kinase AND organism_id:9606          # Human kinases
(diabetes OR insulin) AND reviewed:true
cancer NOT lung

# Field-specific
gene:BRCA1
accession:P12345
taxonomy_name:"Homo sapiens"
go:0005515                           # GO term: protein binding

# Range queries
length:[100 TO 500]
mass:[50000 TO 100000]

# Wildcards
gene:BRCA*

2. Protein Entry Retrieval

Retrieve individual protein entries by accession number.

import requests

def get_protein(accession, format="json"):
    """Retrieve a single protein entry."""
    url = f"https://rest.uniprot.org/uniprotkb/{accession}"
    resp = requests.get(url, headers={"Accept": f"application/{format}"})
    resp.raise_for_status()
    return resp.json() if format == "json" else resp.text

# Get human insulin
entry = get_protein("P01308")
print(f"Protein: {entry['proteinDescription']['recommendedName']['fullName']['value']}")
print(f"Gene: {entry['genes'][0]['geneName']['value']}")
print(f"Length: {entry['sequence']['length']} aa")
print(f"Sequence: {entry['sequence']['value'][:50]}...")

# Get FASTA directly
fasta = requests.get("https://rest.uniprot.org/uniprotkb/P01308.fasta").text
print(fasta[:200])

3. ID Mapping

Map identifiers between UniProt and other databases.

import requests
import time

def map_ids(ids, from_db, to_db):
    """Map identifiers between databases (async job)."""
    # Submit job
    resp = requests.post("https://rest.uniprot.org/idmapping/run",
                         data={"from": from_db, "to": to_db, "ids": ",".join(ids)})
    resp.raise_for_status()
    job_id = resp.json()["jobId"]

    # Poll for completion
    while True:
        status = requests.get(f"https://rest.uniprot.org/idmapping/status/{job_id}").json()
        if "results" in status or "failedIds" in status:
            break
        time.sleep(1)

    # Get results
    results = requests.get(f"https://rest.uniprot.org/idmapping/results/{job_id}").json()
    return results

# UniProt → PDB mapping
results = map_ids(["P01308", "P12345"], from_db="UniProtKB_AC-ID", to_db="PDB")
for r in results.get("results", []):
    print(f"{r['from']} → PDB: {r['to']}")

# UniProt → Ensembl mapping
results = map_ids(["P01308"], from_db="UniProtKB_AC-ID", to_db="Ensembl")
for r in results.get("results", []):
    print(f"{r['from']} → Ensembl: {r['to']}")

Common database codes: UniProtKB_AC-ID, Ensembl, RefSeq_Protein, PDB, Gene_Name, GeneID, KEGG

4. Batch Retrieval and Streaming

Retrieve large datasets efficiently.

import requests
import time

def batch_retrieve(accessions, fields=None, format="tsv"):
    """Retrieve multiple proteins by accession."""
    query = " OR ".join(f"accession:{acc}" for acc in accessions)
    params = {"query": query, "format": format}
    if fields:
        params["fields"] = ",".join(fields)
    resp = requests.get("https://rest.uniprot.org/uniprotkb/search", params=params)
    resp.raise_for_status()
    return resp.text

# Batch retrieve
accessions = ["P01308", "P12345", "Q9Y6K9"]
tsv = batch_retrieve(accessions, fields=["accession", "gene_names", "protein_name", "length"])
print(tsv)

# Streaming for large queries (no pagination needed)
def stream_query(query, format="fasta"):
    """Stream large result sets."""
    url = f"https://rest.uniprot.org/uniprotkb/stream?query={query}&format={format}"
    resp = requests.get(url, stream=True)
    resp.raise_for_status()
    for chunk in resp.iter_content(chunk_size=8192, decode_unicode=True):
        yield chunk

# Stream all human kinases as FASTA
# for chunk in stream_query("kinase AND organism_id:9606 AND reviewed:true"):
#     print(chunk[:200])

5. Pagination and Cursor-Based Iteration

Handle large result sets with pagination using the Link header cursor.

import requests

def paginate_search(query, fields=None, page_size=500):
    """Iterate all pages of a UniProt search using cursor pagination."""
    params = {"query": query, "format": "tsv", "size": page_size}
    if fields:
        params["fields"] = ",".join(fields)
    url = "https://rest.uniprot.org/uniprotkb/search"
    rows = []
    header = None
    while url:
        resp = requests.get(url, params=params)
        resp.raise_for_status()
        params = {}  # cursor is embedded in the next URL
        lines = resp.text.strip().split("\n")
        if header is None:
            header = lines[0]
        rows.extend(lines[1:])
        # Follow Link header for next page
        link = resp.headers.get("Link", "")
        url = link.split("<")[1].split(">")[0] if "<" in link else None
    return header, rows

header, rows = paginate_search(
    "kinase AND organism_id:9606 AND reviewed:true",
    fields=["accession", "gene_names", "length"]
)
print(f"Retrieved {len(rows)} proteins")
print(header)
print("\n".join(rows[:3]))

6. Field Selection and Annotations

Customize which data fields to retrieve.

import requests
import pandas as pd
from io import StringIO

# Retrieve specific annotation fields
params = {
    "query": "gene:TP53 AND organism_id:9606 AND reviewed:true",
    "format": "tsv",
    "fields": "accession,gene_names,protein_name,go_p,go_f,go_c,cc_function,ft_domain",
}
resp = requests.get("https://rest.uniprot.org/uniprotkb/search", params=params)
df = pd.read_csv(StringIO(resp.text), sep="\t")
print(df.columns.tolist())
print(df.iloc[0])

Common field groups:

Sequence: accession, sequence, length, mass
Names: gene_names, protein_name, organism_name
GO: go_p (process), go_f (function), go_c (component)
Features: ft_domain, ft_binding, ft_act_site, ft_mod_res
Comments: cc_function, cc_interaction, cc_subcellular_location

Key Parameters

|-----------|-------------------|---------|-----------------|--------|

Best Practices

Filter reviewed:true for curated data: Swiss-Prot entries are manually reviewed; TrEMBL entries are computationally predicted. Use Swiss-Prot for high-confidence annotations.

Use TSV format with fields for tabular analysis: Requesting only needed fields as TSV is faster and easier to parse than full JSON entries.

Use streaming for large downloads: The /stream endpoint returns all results without pagination, avoiding the need for multi-page iteration.

Add time.sleep(0.5) between batch requests: Respect API resources, especially when making many sequential requests.

Cache frequently accessed entries locally: UniProt updates monthly; cache results and re-fetch only when needed.

Anti-pattern — querying without organism_id: Broad queries like gene:INS return thousands of entries across all species. Always filter by organism for targeted results.

Common Recipes

Recipe: Download All Human Kinases as DataFrame

import requests
import pandas as pd
from io import StringIO

url = "https://rest.uniprot.org/uniprotkb/stream"
params = {
    "query": "ec:2.7.* AND organism_id:9606 AND reviewed:true",
    "format": "tsv",
    "fields": "accession,gene_names,protein_name,length,go_f",
}
resp = requests.get(url, params=params)
df = pd.read_csv(StringIO(resp.text), sep="\t")
print(f"Human kinases (Swiss-Prot): {len(df)}")
print(df.head())

Recipe: Extract GO Annotations for a Gene Set

import requests
import pandas as pd
from io import StringIO

gene_list = ["BRCA1", "BRCA2", "TP53", "ATM", "CHEK2"]
query = " OR ".join(f"gene:{g}" for g in gene_list)
query += " AND organism_id:9606 AND reviewed:true"

params = {
    "query": query,
    "format": "tsv",
    "fields": "accession,gene_names,go_p,go_f,go_c",
}
resp = requests.get("https://rest.uniprot.org/uniprotkb/search", params=params)
df = pd.read_csv(StringIO(resp.text), sep="\t")
print(df[["Accession", "Gene Names", "Gene Ontology (biological process)"]].head())

Recipe: Cross-Reference UniProt to PDB Structures

import requests
import time

accessions = ["P53_HUMAN", "P01308", "P00533"]  # TP53, Insulin, EGFR
resp = requests.post("https://rest.uniprot.org/idmapping/run",
                     data={"from": "UniProtKB_AC-ID", "to": "PDB", "ids": ",".join(accessions)})
job_id = resp.json()["jobId"]
time.sleep(2)
results = requests.get(f"https://rest.uniprot.org/idmapping/results/{job_id}").json()
for r in results.get("results", []):
    print(f"{r['from']} → PDB: {r['to']}")

Troubleshooting

| Problem | Cause | Solution |

|---------|-------|----------|

| 400 Bad Request | Invalid query syntax | Check Boolean operators, field names, bracket matching; use UniProt query syntax docs |

| Too many results (slow) | No organism or review filter | Add AND organism_id:9606 AND reviewed:true to narrow results |

| ID mapping returns empty | Wrong database code | Verify from/to codes: use UniProtKB_AC-ID (not UniProtKB alone) |

| Pagination missing entries | Large result set | Use /stream endpoint instead of paginated /search |

| 429 Too Many Requests | Excessive API calls | Add time.sleep(0.5) between requests; batch accessions in single queries |

| FASTA has no gene name | TrEMBL entry with minimal annotation | Filter reviewed:true for Swiss-Prot entries with full annotations |

biopython-molecular-biology — parse FASTA sequences returned by UniProt; run BLAST with retrieved sequences
alphafold-database-access — retrieve predicted 3D structures using UniProt accessions
esm-protein-language-model — generate embeddings from UniProt protein sequences
gget-genomic-databases — alternative interface for quick gene/protein lookups across databases

References

UniProt REST API documentation — official API reference
UniProt query syntax — field-specific search operators
UniProt Consortium (2023) — "UniProt: the Universal Protein Knowledgebase in 2023" — Nucleic Acids Research

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How to use it

Copy the folder

Take jaechang-hits/uniprot-protein-database from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

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Install what it needs

The instructions reference pip. Without those the skill loads but fails at the first command.

Uniprot Protein Database Skill for Cursor

Install

The instruction itself

UniProt — Protein Database

Overview

When to Use

Prerequisites

Quick Start

Core API

1. Protein Search

2. Protein Entry Retrieval

3. ID Mapping

4. Batch Retrieval and Streaming

5. Pagination and Cursor-Based Iteration

6. Field Selection and Annotations

Key Parameters

Best Practices

Common Recipes

Recipe: Download All Human Kinases as DataFrame

Recipe: Extract GO Annotations for a Gene Set

Recipe: Cross-Reference UniProt to PDB Structures

Troubleshooting

Related Skills

References

Other skills for the same job

How to use it