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Título: | Structure of acetylglutamate kinase, a key enzyme for arginine biosynthesis and a prototype for the amino acid kinase enzyme family, during catalysis |
Autor: | Ramón-Maiques, Santiago CSIC ORCID ; Marina, Alberto CSIC ORCID ; Gil-Ortiz, Fernando CSIC ORCID; Fita, Ignacio CSIC ORCID ; Rubio, Vicente CSIC ORCID | Palabras clave: | Protein crystallography Phosphoryl group transfer Carbamate kinase Arginine biosynthesis Amino acid kinase Acetylglutamate kinase |
Fecha de publicación: | 2002 | Editor: | Cell Press | Citación: | Structure 10(3): 329-342 (2002) | Resumen: | N-Acetyl-L-glutamate kinase (NAGK), a member of the amino acid kinase family, catalyzes the second and frequently controlling step of arginine synthesis. The Escherichia coli NAGK crystal structure to 1.5 Å resolution reveals a 258-residue subunit homodimer nucleated by a central 16-stranded molecular open β sheet sandwiched between α helices. In each subunit, AMPPNP, as an αβγ-phosphate-Mg2+ complex, binds along the sheet C edge, and N-acetyl-L-glutamate binds near the dyadic axis with its γ-COO- aligned at short distance from the γ-phosphoryl, indicating associative phosphoryl transfer assisted by: (1) Mg2+ complexation; (2) the positive charges on Lys8, Lys217, and on two helix dipoles; and (3) by hydrogen bonding with the γ-phosphate. The structural resemblance with carbamate kinase and the alignment of the sequences suggest that NAGK is a structural and functional prototype for the amino acid kinase family, which differs from other acylphosphate-making devices represented by phosphoglycerate kinase, acetate kinase, and biotin carboxylase. | Versión del editor: | http://dx.doi.org/10.1016/S0969-2126(02)00721-9 | URI: | http://hdl.handle.net/10261/111176 | DOI: | 10.1016/S0969-2126(02)00721-9 | Identificadores: | doi: 10.1016/S0969-2126(02)00721-9 issn: 0969-2126 |
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