Google DeepMind Launches SynthID Bio to Watermark AI-Designed Proteins

Google DeepMind has released SynthID Bio, a watermarking system that embeds imperceptible signatures into AI-generated protein sequences and 3D structures while preserving biological function. The system adjusts amino acid choices in sequences and atomic coordinates in 3D structures, and the watermarks survive synthesis into physical proteins. In wet-lab tests across three target proteins (VEGF-A, SARS-CoV-2 spike RBD, and PD-L1), watermarked protein binders matched the hit rate, binding affinity, and sequence diversity of unwatermarked versions. The technology addresses a biosecurity gap: existing DNA-screening software cannot detect AI-designed threatening proteins because, as one source put it, "nobody has characterized them well enough to know that they're threats." SynthID Bio is also being integrated into the Evo 2 genomic model through an ongoing collaboration with Stanford's Hie lab and Arc Institute, with early lab testing confirming functionality on a designed bacteriophage genome.