The feruloyl esterase system of Talaromyces stipitatus: production of three discrete feruloyl esterases, including a novel enzyme, TsFaeC, with a broad substrate specificity

J Biotechnol. 2004 Mar 18;108(3):227-41. doi: 10.1016/j.jbiotec.2003.12.003.

Abstract

Several extracellular feruloyl esterases were produced by the mesophilic fungus Talaromyces stipitatus when grown on selective carbon sources in liquid media. Type-A and Type-B feruloyl esterases, as defined by their substrate specificity against methyl hydroxycinnamates, were produced during growth on wheat bran and sugar beet pulp, respectively. In addition, Tal. stipitatus produced a new type of esterase (TsFaeC) during growth on sugar beet pulp with a broader spectrum of activity (Type-C) against the (hydroxy)cinnamate esters than those previously described. All three enzymes were purified and N-terminal amino acid sequences and internal peptide sequences determined. The TsFaeC sequences were used to amplify a gene fragment from Tal. stipitatus genomic DNA. The flanking sequences were identified with the aid of RACE-RTPCR, and a full-length clone constructed. The faeC gene is present as a single copy and contains a single intron. The complete cDNA fragment contains an ORF of 1590bp, faeC, which is predicted to encode a 530 amino acid pre-protein, including a 25-residue signal peptide, and to produce a mature protein of M(R) 55 340Da. There was no evidence for a carbohydrate-binding domain in TsFaeC.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Carboxylic Ester Hydrolases / analysis
  • Carboxylic Ester Hydrolases / biosynthesis*
  • Carboxylic Ester Hydrolases / chemistry*
  • Carboxylic Ester Hydrolases / classification
  • Enzyme Activation
  • Enzyme Stability
  • Hydrogen-Ion Concentration
  • Isoenzymes / chemistry
  • Isoenzymes / metabolism
  • Molecular Sequence Data
  • Molecular Weight
  • Substrate Specificity
  • Talaromyces / enzymology*
  • Temperature

Substances

  • Isoenzymes
  • Carboxylic Ester Hydrolases
  • feruloyl esterase