Funding: D.N. is grateful for funding by the German Research Foundation (DFG, Projektnummer 453202693) and the Aventis foundation. T.S. and D.H. were partially funded via scholarships from the German Academic Scholarship Foundation. B.E.C. is a grantee from the European Research Council (Starting grant - 716058), the Swiss National Science Foundation and the Biltema Foundation. S.R. is supported by a grant of the National Center of Competence in Research in Chemical Biology. Funding for open access publication is provided by the German Research Foundation (DFG, Projektnummer 453202693). Competing interests: D.N. is inventor on several patent applications related to the use and engineering of anti-CRISPR proteins.

Underlying data for the manuscript "A deep mutational scanning platform to characterize the fitness landscape of anti-CRISPR proteins". Contains FACS and NGS read data for the deep mutational scanning experiments carried out on the anti-CRISPR proteins AcrIIA4 and AcrIIA5. The included tar.gz archive has the following directory structure: data/ ngs-a4/ : contains .fasta.gz files for the 8 fractions sequenced for deep mutational scanning analysis for AcrIIA4. ngs-a5/ : contains .fasta.gz files for the 8 fractions sequenced for deep mutational scanning analysis for AcrIIA5. FACS/ : contains .fcs files for the set of measured benchmark single mutants of AcrIIA4 and AcrIIA5, which were used for model trainng.