Interaction between DAHP synthase and chorismate mutase endows new regulation on DAHP synthase activity in Corynebacterium glutamicum.
Appl Microbiol Biotechnol
; 97(24): 10373-80, 2013 Dec.
Article
em En
| MEDLINE
| ID: mdl-23467831
ABSTRACT
Previous research on Corynebacterium glutamicum revealed that 3-deoxy-D-arabino-heptulosonate 7-phosphate synthase (DSCg, formerly DS2098) interacts with chorismate mutase (CMCg, formerly CM0819). In this study, we investigated the interaction by means of structure-guided mutation and enzymatic assays. Our results show that the interaction imparted a new mechanism for regulation of DAHP activity In the absence of CMCg, DSCg activity was not regulated by prephenate, whereas in the presence of CMCg, prephenate markedly inhibited DSCg activity. Prephenate competed with the substrate phosphoenolpyruvate, and the inhibition constant (K i) was determined to be 0.945 mM. Modeling based on the structure of the complex formed between DAHP synthase and chorismate mutase of Mycobacterium tuberculosis predicted the interaction surfaces of the putative DSCg-CMCg complex. The amino acid residues and structural domains that contributed to the interaction surfaces were experimentally identified to be the (212)SPAGARYE(219) sequence of DSCg and the (60)SGGTR(64) loop and C-terminus ((97)RGKLG(101)) of CMCg.
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1
Base de dados:
MEDLINE
Assunto principal:
3-Desoxi-7-Fosfo-Heptulonato Sintase
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Regulação Enzimológica da Expressão Gênica
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Corismato Mutase
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Corynebacterium glutamicum
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article