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Structural studies of Streptococcus pneumoniae EPSP synthase in unliganded state, tetrahedral intermediate‐bound state and S3P‐GLP‐bound state
Author(s) -
Park HaJeung,
Hilsenbeck Jacqueline L.,
Kim Hak Jun,
Shuttleworth Wendy A.,
Park Yong Ho,
Evans Jeremy N.,
Kang ChulHee
Publication year - 2004
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1046/j.1365-2958.2003.03885.x
Subject(s) - biology , enzyme , ligand (biochemistry) , atp synthase , stereochemistry , biochemistry , streptococcus pneumoniae , escherichia coli , moiety , chemistry , receptor , antibiotics , gene
Summary The shikimate pathway synthesizes aromatic amino acids and other essential metabolites that are necessary for bacteria, plants and fungi to survive. This pathway is not present in vertebrates and therefore represents an attractive target for antibacterial agents. We have successfully crystallized and solved the structure of unliganded, inhibitor‐liganded and tetrahedral intermediate (TI)‐liganded forms of Streptococcus pneumoniae EPSP synthase. The overall topology of the S. pneumoniae EPSP synthase is similar to that of the Escherichia coli EPSP synthase. In addition, the majority of residues responsible for ligand binding were conserved between the two proteins. TI‐liganded structure provides absolute configuration of the C‐2 atom from the F‐PEP moiety of the enzyme‐bound intermediate and also defines key residues responsible for the enzyme reaction. Comparison of the unliganded state and substrate‐bound state of the enzyme provides insights into the structural mechanisms involved in dynamic events of ligand binding, domain movement and closure. This structural study of the pathogenic bacteria S. pneumoniae EPSP synthase with inhibitor and TI will provide invaluable information for the design of new‐generation antibiotics.