Primary Citation PubMed: 25423174
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Analysis of mRNA recognition by human thymidylate synthase.
(2014) Biosci Rep 34
PubMed: 25423174 | PubMedCentral: PMC4274661 | DOI: 10.1042/BSR20140137
Figure 2 Superposition of hTS structures The protein structures were determined by X-ray diffraction from crystals grown at low (green, PDB code 4H1I) and high (grey, PDB code 4GYH) salt conditions.
The hTS structure determined at low salt (PDB: 4H1I) represents the first time that the ligand-free protein has been captured in the active conformation, which was previously observed only in a mutant containing the stabilizing mutation R163K (PDB: 2RD8) [ 29 ] and in substrate complexes, including a ternary complex of the enzyme with dUMP as well as the folic acid analogue inhibitor raltitrexed (PDB: 1HVY) [ 30 ].
Inspection of the crystal structure of hTS in the active state, which we obtained at low salt conditions (PDB: 4H1I), revealed that packing of the protein dimers in the crystal involves the surface including a helix–loop–helix motif around residues G84-K104.
The structure of the hTS active conformation in 4H1I is essentially identical to the structure of the R163K variant (Supplementary Figure S2 and Supplementary Table S3).
Coordinates and structure factors for the hTS protein have been deposited in the RCSB PDB under accession codes 4H1I (low salt structure) and 4GYH (high salt structure).
In both the low and high salt structures 4GYH and 4H1I, a sulfate ion was located at the position of the dUMP phosphate group in the ternary complex.
Publication Year: 2014
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