NDLI: Residues Asn214, Gln211, Glu219 and Gln221 contained in the subfamily 3 catalytic signature of the isocitrate lyase from Pseudomonas aeruginosa are involved in its catalytic and thermal properties

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Residues Asn214, Gln211, Glu219 and Gln221 contained in the subfamily 3 catalytic signature of the isocitrate lyase from Pseudomonas aeruginosa are involved in its catalytic and thermal properties

Content Provider	Springer Nature Link
Author	Campos Garcia, Jesus Diaz Perez, Cesar Diaz Perez, Alma Laura
Copyright Year	2013
Abstract	Isocitrate lyase, encoded by the aceA gene, plays an important role in the ability of Pseudomonas aeruginosa to grow on fatty acids, acetate, acyclic terpenes, and amino acids. Phylogenetic analysis indicated that the ICL superfamily is divided in two families: the ICL family, which includes five subfamilies, and the 2-methylisocitrate lyase (MICL) family. ICL from P. aeruginosa (ICL-Pa) was identified in a different ICL node (subfamily 3) than other Pseudomonas ICL enzymes (grouped in subfamily 1). Analysis also showed that psychrophilic bacteria are mainly grouped in ICL subfamily 3, whose ICL proteins contain the highly conserved catalytic pattern Q$_{IE}$N$_{Q}$V$_{S}$DE$_{K}$Q$_{CGH}$QD. We performed site-directed mutagenesis, enzymatic activity, and structure modeling of conserved residues in mutated ICLs by using ICL-Pa as a model. Our results indicated that the N214 residue is essential for catalytic function, while mutating the Q211, E219, and Q221 residues impairs its catalytic and thermostability properties. Our findings suggest that conserved residues in the subfamily 3 signature of ICL-Pa play important roles in catalysis and thermostability and are likely associated with the catalytic loop structural conformation.
Starting Page	991
Ending Page	999
Page Count	9
File Format	PDF
ISSN	09593993
Journal	World Journal of Microbiology and Biotechnology
Volume Number	29
Issue Number	6
e-ISSN	15730972
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-01-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Isocitrate lyase Pseudomonas aeruginosa Site-directed mutagenesis Molecular modeling Applied Microbiology Biotechnology Biochemistry Environmental Engineering/Biotechnology Microbiology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Applied Microbiology and Biotechnology Biotechnology

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Residues Asn214, Gln211, Glu219 and Gln221 contained in the subfamily 3 catalytic signature of the isocitrate lyase from Pseudomonas aeruginosa are involved in its catalytic and thermal properties.

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Residues Asn214, Gln211, Glu219 and Gln221 contained in the subfamily 3 catalytic signature of the isocitrate lyase from Pseudomonas aeruginosa are involved in its catalytic and thermal properties

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Residues Asn214, Gln211, Glu219 and Gln221 contained in the subfamily 3 catalytic signature of the isocitrate lyase from Pseudomonas aeruginosa are involved in its catalytic and thermal properties