Combining in-situ proteolysis and microseed matrix screening to promote crystallization of PrPc-nanobody complexes

Prion proteins (PrPs) are difficult to crystallize, probably due to their inherent flexibility. Several PrPs structures have been solved by nuclear magnetic resonance (NMR) techniques; however, only three structures were solved by X-ray crystallography. Here we combined in-situ proteolysis with automated microseed matrix screening (MMS) to crystallize two different PrP C-nanobody (Nb) complexes. Nanobodies are single-domain antibodies derived from heavy-chain-only antibodies of camelids. Initial crystallization screening conditions using in-situ proteolysis of mouse prion (23-230) in complex with a nanobody (Nb-PrP-01) gave thin needle aggregates, which were of poor diffraction quality. Next, we used these microcrystals as nucleants for automated MMS. Good-quality crystals were obtained from mouse PrP (89-230)/Nb-PrP-01, belonged to the monoclinic space group P 1 21 1, with unit-cell parameters a = 59.13, b = 63.80, c = 69.79 A, β = 101.96° and diffracted to 2.1A resolution using synchrotron radiation. Human PrP (90-231)/Nb-PrP-01 crystals belonged to the monoclinic space group C2, with unit-cell parameters a = 131.86, b = 45.78, c = 45.09 A, β = 96.23° and diffracted to 1.5 A resolution. This combined strategy benefits from the power of the MMS technique without suffering from the drawbacks of the in-situ proteolysis. It proved to be a successful strategy to crystallize PrP-nanobodies complexes and could be exploited for the crystallization of other difficult antigen-antibody complexes. © The Author 2011. Published by Oxford University Press. All rights reserved.