6DKM

DHD131

Summary for 6DKM

• Entry DOI: 10.2210/pdb6dkm/pdb
• Descriptor: DHD131_A, DHD131_B (3 entities in total)
• Functional Keywords: computational design, heterodimer, coiled-coil, de novo protein
• Biological source: synthetic construct; More
• Total number of polymer chains: 8
• Total formula weight: 77899.06

Authors

Bick, M.J.,Chen, Z.,Baker, D. (deposition date: 2018-05-29, release date: 2018-12-19, Last modification date: 2024-04-03)

Primary citation

Chen, Z.,Boyken, S.E.,Jia, M.,Busch, F.,Flores-Solis, D.,Bick, M.J.,Lu, P.,VanAernum, Z.L.,Sahasrabuddhe, A.,Langan, R.A.,Bermeo, S.,Brunette, T.J.,Mulligan, V.K.,Carter, L.P.,DiMaio, F.,Sgourakis, N.G.,Wysocki, V.H.,Baker, D.
Programmable design of orthogonal protein heterodimers.
Nature, 565:106-111, 2019

PubMed Abstract: Specificity of interactions between two DNA strands, or between protein and DNA, is often achieved by varying bases or side chains coming off the DNA or protein backbone-for example, the bases participating in Watson-Crick pairing in the double helix, or the side chains contacting DNA in TALEN-DNA complexes. By contrast, specificity of protein-protein interactions usually involves backbone shape complementarity, which is less modular and hence harder to generalize. Coiled-coil heterodimers are an exception, but the restricted geometry of interactions across the heterodimer interface (primarily at the heptad a and d positions) limits the number of orthogonal pairs that can be created simply by varying side-chain interactions. Here we show that protein-protein interaction specificity can be achieved using extensive and modular side-chain hydrogen-bond networks. We used the Crick generating equations to produce millions of four-helix backbones with varying degrees of supercoiling around a central axis, identified those accommodating extensive hydrogen-bond networks, and used Rosetta to connect pairs of helices with short loops and to optimize the remainder of the sequence. Of 97 such designs expressed in Escherichia coli, 65 formed constitutive heterodimers, and the crystal structures of four designs were in close agreement with the computational models and confirmed the designed hydrogen-bond networks. In cells, six heterodimers were fully orthogonal, and in vitro-following mixing of 32 chains from 16 heterodimer designs, denaturation in 5 M guanidine hydrochloride and reannealing-almost all of the interactions observed by native mass spectrometry were between the designed cognate pairs. The ability to design orthogonal protein heterodimers should enable sophisticated protein-based control logic for synthetic biology, and illustrates that nature has not fully explored the possibilities for programmable biomolecular interaction modalities.

PubMed: 30568301
DOI: 10.1038/s41586-018-0802-y

Experimental method

X-RAY DIFFRACTION (2.38 Å)