Anthropic maps the first 3D vault structure from a prokaryotic cell
Its biology team used Claude to find, isolate and map a shell of 96 copies of a bacteriophage protein. The function of vaults remains unknown, and the work is at preprint stage.
Source published · In the Daily Brief of 5 November 2026
Filed under AI industry, Agents
Vaults are hollow protein barrels discovered in 1986. Mammalian vaults contain 78 copies of one protein. Anthropic’s particle, built from a phage protein it calls L05 and made in E. coli, has 96 copies and a mass of about 9.5 megadaltons. It measures roughly 54 by 45 nanometres and encloses about 25% more volume than the mammalian form.
Under human direction, Claude searched about 15bn predicted proteins, designed DNA constructs, helped cut purification from three days to about 90 minutes and ran the cryo-electron microscopy processing. A first model took 34 hours. Copying two wall segments enlarged the enclosed volume by about 20%.
Anthropic also lists the errors. A protocol with the wrong additive cost two weeks, and a skipped step produced a map blended with its mirror image. It has not tested whether these vaults form in their natural hosts. The manuscript has been submitted to bioRxiv.