Publikationsdatum:
2013-12-03
Beschreibung:
The crystal structures of glycinamide ribonucleotide transformylases (PurNs) from Aquifex aeolicus ( Aa ), Geobacillus kaustophilus ( Gk ) and Symbiobacterium toebii ( St ), and of formyltetrahydrofolate hydrolase (PurU) from Thermus thermophilus ( Tt ) were determined. The monomer structures of the determined PurN and PurU were very similar to the known structure of PurN, but oligomeric states were different; Aa PurN and St PurN formed dimers, Gk PurN formed monomer and PurU formed tetramer in the crystals. PurU had a regulatory ACT domain in its N-terminal side. So far several structures of PurUs have been determined, yet, the mechanisms of the catalysis and the regulation of PurU have not been elucidated. We, therefore, modelled ligand-bound structures of PurN and PurU, and performed molecular dynamics simulations to elucidate the reaction mechanisms. The evolutionary relationship of the two enzymes is discussed based on the comparisons of the structures and the catalytic mechanisms.
Print ISSN:
0021-924X
Digitale ISSN:
1756-2651
Thema:
Biologie
,
Chemie und Pharmazie
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