6M4U image
Entry Detail
PDB ID:
6M4U
Keywords:
Title:
Crystal structure of FKBP-FRB T2098L mutant in complex with rapamycin
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2020-03-09
Release Date:
2020-08-26
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.25
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Peptidyl-prolyl cis-trans isomerase FKBP1A
Chain IDs:A, C (auth: E)
Chain Length:110
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Serine/threonine-protein kinase mTOR
Mutations:T2098L
Chain IDs:B, D (auth: F)
Chain Length:95
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Rational design and implementation of a chemically inducible heterotrimerization system.
Nat.Methods 17 928 936 (2020)
PMID: 32747768 DOI: 10.1038/s41592-020-0913-x

Abstact

Chemically inducible dimerization (CID) uses a small molecule to induce binding of two different proteins. CID tools such as the FK506-binding protein-FKBP-rapamycin-binding- (FKBP-FRB)-rapamycin system have been widely used to probe molecular events inside and outside cells. While various CID tools are available, chemically inducible trimerization (CIT) does not exist, due to inherent challenges in designing a chemical that simultaneously binds three proteins with high affinity and specificity. Here, we developed CIT by rationally splitting FRB and FKBP. Cellular and structural datasets showed efficient trimerization of split pairs of FRB or FKBP with full-length FKBP or FRB, respectively, by rapamycin. CIT rapidly induced tri-organellar junctions and perturbed intended membrane lipids exclusively at select membrane contact sites. By conferring one additional condition to what is achievable with CID, CIT expands the types of manipulation in single live cells to address cell biology questions otherwise intractable and engineer cell functions for future synthetic biology applications.

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