fully-autonomous-characterization-data-collection-from-crystals

Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules

High-brilliance X-ray beams coupled with automation have&#160;led to the use of synchrotron-based macromolecular X-ray crystallography (MX) beamlines for ...

European Molecular Biology Laboratory

Domain motions are essential to many catalytic mechanisms in enzymes but they are often difficult to study. X-ray crystal structures can provide molecular details of snapshots of catalysis but many states important in the cycle remain inaccessible using this technique. Phosphoglycerate kinase (PGK) undergoes large domain movements in order to catalyse the production of ATP. PGK is the enzyme responsible for the first ATP generating step of glycolysis and has been implicated in oncogenesis and the in vivo activation of l-nucleoside pro-drugs effective against retroviruses. Its mechanism requires considerable hinge bending to bring the substrates into proximity in order for phosphoryl transfer to occur. The enzyme has been the subject of intense study for decades but new crystal structures, methods in solution scattering and modelling techniques are throwing light on the dynamics of catalysis of this archetypal kinase. Here, I argue that Brownian forces acting on the protein are the dominant factor in the catalytic cycle and that the enzyme has evolved measures to harness this force for efficient catalysis.

Conformational dynamics in phosphoglycerate kinase, an open and shut case?

The causative agent of toxoplasmosis, the intracellular parasite Toxoplasma gondii, delivers a protein, GRA24, into the cells it infects that interacts with the mitogen-activated protein (MAP) kinase p38α (MAPK14), leading to activation and nuclear translocation of the host kinase and a subsequent inflammatory response that controls the progress of the parasite. The purification of a recombinant complex of GRA24 and human p38α has allowed the molecular basis of this activation to be determined. GRA24 is shown to be intrinsically disordered, binding two kinases that act independently, and is the only factor required to bypass the canonical mitogen-activated protein kinase activation pathway. An adapted kinase interaction motif (KIM) forms a highly stable complex that competes with cytoplasmic regulatory partners. In addition, the recombinant complex forms a powerful in vitro tool to evaluate the specificity and effectiveness of p38α inhibitors that have advanced to clinical trials, as it provides a hitherto unavailable stable and highly active form of p38α.

Structural Basis for the Subversion of MAP Kinase Signaling by an Intrinsically Disordered Parasite Secreted Agonist.

MXCuBE2 is the second-generation evolution of the MXCuBE beamline control software, initially developed and used at ESRF - the European Synchrotron. MXCuBE2 extends, in an intuitive graphical user interface (GUI), the functionalities and data collection methods available to users while keeping all previously available features and allowing for the straightforward incorporation of ongoing and future developments. MXCuBE2 introduces an extended abstraction layer that allows easy interfacing of any kind of macromolecular crystallography (MX) hardware component, whether this is a diffractometer, sample changer, detector or optical element. MXCuBE2 also works in strong synergy with the ISPyB Laboratory Information Management System, accessing the list of samples available for a particular experimental session and associating, either from instructions contained in ISPyB or from user input via the MXCuBE2 GUI, different data collection types to them. The development of MXCuBE2 forms the core of a fruitful collaboration which brings together several European synchrotrons and a software development factory and, as such, defines a new paradigm for the development of beamline control platforms for the European MX user community.

Matthew W. Bowler

Grenoble Outstation

European Molecular Biology Laboratory

Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules

Matthew W. Bowler

.css-o250i3{font-size:18px;font-family:Open Sans,sans-serif;line-height:21.6px;}Grenoble Outstation

European Molecular Biology Laboratory

Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules

Grenoble Outstation