Free energy requirement for domain movement of an enzymeIshijima, J., Nakai, T., Kawaguchi, S., Hirotsu, K., Kuramitsu, S.
(2000) J Biol Chem 275: 18939-18945
- PubMed: 10858450
- DOI: https://doi.org/10.1074/jbc.275.25.18939
- Primary Citation of Related Structures:
1C9C, 1CQ6, 1CQ7, 1CQ8
- PubMed Abstract:
Domain movement is sometimes essential for substrate recognition by an enzyme. X-ray crystallography of aminotransferase with a series of aliphatic substrates showed that the domain movement of aspartate aminotransferase was changed dramatically from an open to a closed form by the addition of only one CH(2) to the side chain of the C4 substrate CH(3)(CH(2))C((alpha))H(NH(3)(+))COO(-). These crystallographic results and reaction kinetics (Kawaguchi, S., Nobe, Y., Yasuoka, J., Wakamiya, T., Kusumoto, S., and Kuramitsu, S. (1997) J. Biochem. (Tokyo) 122, 55-63; Kawaguchi, S. and Kuramitsu, S. (1998) J. Biol. Chem. 273, 18353-18364) enabled us to estimate the free energy required for the domain movement.
Department of Biology, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. Osaka 558-8585, Japan.