GET /uniprotkb/search

Search the UniProt Knowledgebase (UniProtKB) for protein entries matching your query. This is the primary way to discover proteins by name, function, organism, disease association, or any other annotated property. The search returns a paginated list of protein entries with rich metadata including accession numbers, protein names, gene names, organism details, and functional annotations. Use this endpoint when you need to find proteins matching criteria (e.g., "all human kinases") rather than when you already know a specific accession number. For known accessions, use the `/uniprotkb/{accession}` endpoint instead.