Volume 70, Issue 1 pp. 157-166
Research Article

Identification of fungal oxaloacetate hydrolyase within the isocitrate lyase/PEP mutase enzyme superfamily using a sequence marker-based method

Henk-Jan Joosten

Henk-Jan Joosten

Laboratory of Microbiology, Wageningen University, 6703 HA Wageningen, The Netherlands

Henk-Jan Joosten and Ying Han contributed equally to this work.

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Ying Han

Ying Han

Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131

Henk-Jan Joosten and Ying Han contributed equally to this work.

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Weiling Niu

Weiling Niu

Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131

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Jacques Vervoort

Jacques Vervoort

Laboratory Biochemistry, Wageningen University, 6703 HA Wageningen, The Netherlands

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Debra Dunaway-Mariano

Debra Dunaway-Mariano

Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131

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Peter J. Schaap

Corresponding Author

Peter J. Schaap

Laboratory of Microbiology, Wageningen University, 6703 HA Wageningen, The Netherlands

Laboratory of Microbiology, Dreijenlaan 2, 6703 HA Wageningen, The Netherlands===Search for more papers by this author
First published: 24 July 2007
Citations: 23

Abstract

Aspergillus niger produces oxalic acid through the hydrolysis of oxaloacetate, catalyzed by the cytoplasmic enzyme oxaloacetate acetylhydrolase (OAH). The A. niger genome encodes four additional open reading frames with strong sequence similarity to OAH yet only the oahA gene encodes OAH activity. OAH and OAH-like proteins form subclass of the isocitrate lyase/PEP mutase enzyme superfamily, which is ubiquitous present filamentous fungi. Analysis of function-specific residues using a superfamily-based approach revealed an active site serine as a possible sequence marker for OAH activity. We propose that presence of this serine in family members correlates with presence of OAH activity whereas its absence correlates with absence of OAH. This hypothesis was tested by carrying out a serine mutagenesis study with the OAH from the fungal oxalic acid producer Botrytis cinerea and the OAH active plant petal death protein as test systems. Proteins 2008. © 2007 Wiley-Liss, Inc.

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