Ai-assisted research unravels 40-year-old mystery of cellular vault structure

Anthropic's biology team utilized Claude to determine the three-dimensional structure of a prokaryotic Vault, a vesicle-like complex that had remained functionally unexplained despite its presence in nearly 10,000 copies per human cell. The breakthrough involved analyzing 15 billion predicted sequences, leading the team to select 44 candidates from 29 bacterial and 4 archaeal phyla for lab testing. Electron microscopy confirmed four complete structures, including phage L05, which achieved a 3.2 Å resolution. This structure featured 96 identical protein chains, each with 7 wall repeats, and measured 54.5 × 47.5 nm, possessing an internal volume 25% larger than human vaults. Furthermore, the research demonstrated that altering the number of wall repeats could tune the particle's size by approximately 20%. Claude significantly accelerated the process, reducing purification time from three days to just 90 minutes, and enabling the first complete structural model generation in 34 hours. Despite the success, the AI demonstrated limitations; a suggested additive caused two weeks of research delay, and initial image processing errors required intensive human oversight. The structural data for L05 and its variants have been deposited in the Protein Data Bank.