In these separations, a biomolecule such as an enzyme binds to a substrate attached to the solid phase while other components are eluted.
We report the X-ray crystal structures of a human enzyme of the soluble apyrase family in its apo state and bound to a substrate analog.
Using a simple lattice model we show that it is feasible to design protein-like lattice proteins that can have two different conformations, depending on whether or not they are bound to a substrate.
Here, we present an approach for the prediction of binding preferences of members of a large protein family for which structural information for a number of family members bound to a substrate is available.
We have determined the structure of the enzyme bound to a substrate analogue, nicotinic acid, from three crystal forms at resolutions of 1.7 Å, 1.8 Å and 2.4 Å, representing ten non-crystallographically related monomers.
Cocrystal structures of Methanococcus jannaschii diaminopimelate decarboxylase (DAPDC) bound to a substrate analog, azelaic acid, and its L-lysine product have been determined at 2.6 Å and 2.0 Å, respectively.
Generally, motility assays are performed with the motor bound to a substrate via the rod domain (S2 plus LMM), which would argue that the S1 S2 junction is comparatively immobile and the actin filament free to move during these assays.
Many proteins have regions that remain 'unstructured' unless bound to a substrate: they do not adopt a unique stable conformation in isolation.
Also, the imidizoyl moiety of H49 contacts the oxygen atom of the nucleophilic 2′ hydroxyl group in the structural model(2) and in the structure of RNase T1 bound to a substrate analogue.
All STPKs analysed to date include a conserved domain of 250 300 amino acids, which binds first to ATP (and, in very few cases, like casein kinase 2, to GTP) and then binds to a substrate protein for transfer of the phosphate group derived from ATP (GTP) to the substrate protein.
