Download MendeleyStructure of Escherichia coli AMP Nucleosidase Reveals Similarity to Nucleoside Phosphorylases
Zhang, Y., Cottet, S.E., Ealick, S.E.(2004) Structure 12: 1383-1394
- PubMed: 15296732
- DOI: https://doi.org/10.1016/j.str.2004.05.015
- Primary Citation of Related Structures:
1T8R, 1T8S, 1T8W, 1T8Y - PubMed Abstract:
AMP nucleosidase (AMN) catalyzes the hydrolysis of AMP to form adenine and ribose 5-phosphate. The enzyme is found only in prokaryotes, where it plays a role in purine nucleoside salvage and intracellular AMP level regulation. Enzyme activity is stimulated by ATP and suppressed by phosphate. The structure of unliganded AMN was determined at 2.7 A resolution, and structures of the complexes with either formycin 5'-monophosphate or inorganic phosphate were determined at 2.6 A and 3.0 A resolution, respectively. AMN is a biological homohexamer, and each monomer is composed of two domains: a catalytic domain and a putative regulatory domain. The overall topology of the catalytic domain and some features of the substrate binding site resemble those of the nucleoside phosphorylases, demonstrating that AMN is a new member of the family. The structure of the regulatory domain consists of a long helix and a four-stranded sheet and has a novel topology.
Organizational Affiliation:
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
