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Appl. Environ. Microbiol., 12 1997, 4638-4644, Vol 63, No. 12
RP de Vries, B Michelsen, CH Poulsen, PA Kroon, RH van den Heuvel, CB Faulds, G Williamson, JP van den Hombergh and J Visser
We report the cloning and characterization of a gene encoding a ferulic
acid esterase, faeA, from Aspergillus niger and Aspergillus tubingensis.
The A. niger and A. tubingensis genes have a high degree of sequence
identity and contain one conserved intron. The gene product, FAEA, was
overexpressed in wild-type A. tubingensis and a protease-deficient A. niger
mutant. Overexpression of both genes in wild-type A. tubingensis and an A.
niger protease-deficient mutant showed that the A. tubingensis gene product
is more sensitive to degradation than the equivalent gene product from A.
niger. FAEA from A. niger was identical to A. niger FAE-III (C. B. Faulds
and G. Williamson, Microbiology 140:779-787, 1994), as assessed by
molecular mass, pH and temperature optima, pI, N-terminal sequence, and
activity on methyl ferulate. The faeA gene was induced by growth on wheat
arabinoxylan and sugar beet pectin, and its gene product (FAEA) released
ferulic acid from wheat arabinoxylan. The rate of release was enhanced by
the presence of a xylanase. FAEA also hydrolyzed smaller amounts of ferulic
acid from sugar beet pectin, but the rate was hardly affected by addition
of an endo-pectin lyase.
Copyright © 1997, American Society for Microbiology
The faeA genes from Aspergillus niger and Aspergillus tubingensis encode ferulic acid esterases involved in degradation of complex cell wall polysaccharides
Wageningen Agricultural University, The Netherlands.
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