Download MendeleyCrystal structure of a bifunctional aldolase-dehydrogenase: Sequestering a reactive and volatile intermediate
Manjasetty, A.B., Powlowski, J., Vrielink, A.(2003) Proc Natl Acad Sci U S A 100: 6992-6997
- PubMed: 12764229
- DOI: https://doi.org/10.1073/pnas.1236794100
- Primary Citation of Related Structures:
1NVM - PubMed Abstract:
The crystal structure of the bifunctional enzyme 4-hydroxy-2-ketovalerate aldolase (DmpG)/acylating acetaldehyde dehydrogenase (DmpF), which is involved in the bacterial degradation of toxic aromatic compounds, has been determined by multiwavelength anomalous dispersion (MAD) techniques and refined to 1.7-A resolution. Structures of the two polypeptides represent a previously unrecognized subclass of metal-dependent aldolases, and of a CoA-dependent dehydrogenase. The structure reveals a mixed state of NAD+ binding to the DmpF protomer. Domain movements associated with cofactor binding in the DmpF protomer may be correlated with channeling and activity at the DmpG protomer. In the presence of NAD+ a 29-A-long sequestered tunnel links the two active sites. Two barriers are visible along the tunnel and suggest control points for the movement of the reactive and volatile acetaldehyde intermediate between the two active sites.
Organizational Affiliation:
Department of Molecular, Cellular and Developmental Biology Sinsheimer Laboratory, 1156 High Street, University of California, Santa Cruz, CA 95064, USA.
