Download MendeleyNew insights into the binding mode of coenzymes: structure of Thermus thermophilus Delta1-pyrroline-5-carboxylate dehydrogenase complexed with NADP+.
Inagaki, E., Ohshima, N., Sakamoto, K., Babayeva, N.D., Kato, H., Yokoyama, S., Tahirov, T.H.(2007) Acta Crystallogr Sect F Struct Biol Cryst Commun 63: 462-465
- PubMed: 17554163
- DOI: https://doi.org/10.1107/S1744309107021422
- Primary Citation of Related Structures:
2EHQ - PubMed Abstract:
Delta(1)-Pyrroline-5-carboxylate dehydrogenase (P5CDh) is known to preferentially use NAD(+) as a coenzyme. The k(cat) value of Thermus thermophilus P5CDh (TtP5CDh) is four times lower for NADP(+) than for NAD(+). The crystal structure of NADP(+)-bound TtP5CDh was solved in order to study the structure-activity relationships for the coenzymes. The binding mode of NADP(+) is essentially identical to that in the previously solved NAD(+)-bound form, except for the regions around the additional 2'-phosphate group of NADP(+). The coenzyme-binding site can only accommodate this group by the rotation of a glutamate residue and subtle shifts in the main chain. The 2'-phosphate of NADP(+) increases the number of hydrogen bonds between TtP5CDh and NADP(+) compared with that between TtP5CDh and NAD(+). Furthermore, the phosphate of the bound NADP(+) would restrict the ;bending' of the coenzyme because of steric hindrance. Such bending is important for dissociation of the coenzymes. These results provide a plausible explanation of the lower turnover rate of NADP(+) compared with NAD(+).
Organizational Affiliation:
RIKEN SPring-8 Center, Harima Institute, Japan.
