4D2E: Crystal Structure Of An Integral Membrane Kinase - V2.3

Membrane proteins are key elements in cell physiology and drug targeting, but getting a high-resolution structure by crystallographic means is still enormously challenging. Novel strategies are in big demand to facilitate the structure determination process that will ultimately hasten the day when sequence information alone can provide a three-dimensional model. Cell-free or in vitro expression enables rapid access to large quantities of high-quality membrane proteins suitable for an array of applications. Despite its impressive efficiency, to date only two membrane proteins produced by the in vitro approach have yielded crystal structures. Here, we have analysed synergies of cell-free expression and crystallisation in lipid mesophases for generating an X-ray structure of the integral membrane enzyme diacylglycerol kinase to 2.28-A resolution. The quality of cellular and cell-free-expressed kinase samples has been evaluated systematically by comparing (1) spectroscopic properties, (2) purity and oligomer formation, (3) lipid content and (4) functionality. DgkA is the first membrane enzyme crystallised based on cell-free expression. The study provides a basic standard for the crystallisation of cell-free-expressed membrane proteins and the methods detailed here should prove generally useful and contribute to accelerating the pace at which membrane protein structures are solved.
PDB ID: 4D2EDownload
MMDB ID: 121668
PDB Deposition Date: 2014/5/9
Updated in MMDB: 2014/11
Experimental Method:
x-ray diffraction
Resolution: 2.28  Å
Source Organism:
Similar Structures:
Biological Unit for 4D2E: hexameric; determined by software (PISA)
Molecular Components in 4D2E
Label Count Molecule
Proteins (6 molecules)
Diacylglycerol Kinase(Gene symbol: dgkA)
Molecule annotation
Chemicals (22 molecules)
* Click molecule labels to explore molecular sequence information.

Citing MMDB