Download MendeleyStructure of the dihydrolipoamide succinyltransferase catalytic domain from Escherichia coli in a novel crystal form: a tale of a common protein crystallization contaminant.
Andi, B., Soares, A.S., Shi, W., Fuchs, M.R., McSweeney, S., Liu, Q.(2019) Acta Crystallogr F Struct Biol Commun 75: 616-624
- PubMed: 31475929
- DOI: https://doi.org/10.1107/S2053230X19011488
- Primary Citation of Related Structures:
6PBR - PubMed Abstract:
The crystallization of amidase, the ultimate enzyme in the Trp-dependent auxin-biosynthesis pathway, from Arabidopsis thaliana was attempted using protein samples with at least 95% purity. Cube-shaped crystals that were assumed to be amidase crystals that belonged to space group I4 (unit-cell parameters a = b = 128.6, c = 249.7 Å) were obtained and diffracted to 3.0 Å resolution. Molecular replacement using structures from the PDB containing the amidase signature fold as search models was unsuccessful in yielding a convincing solution. Using the Sequence-Independent Molecular replacement Based on Available Databases (SIMBAD) program, it was discovered that the structure corresponded to dihydrolipoamide succinyltransferase from Escherichia coli (PDB entry 1c4t), which is considered to be a common crystallization contaminant protein. The structure was refined to an R work of 23.0% and an R free of 27.2% at 3.0 Å resolution. The structure was compared with others of the same protein deposited in the PDB. This is the first report of the structure of dihydrolipoamide succinyltransferase isolated without an expression tag and in this novel crystal form.
Organizational Affiliation:
National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973-5000, USA.
