Identification and characterization of ferulic acid esterase from Penicillium chrysogenum 31B: de-esterification of ferulic acid decorated with l-arabinofuranoses and d-galactopyranoses in sugar beet pectin

Publication date: Available online 12 July 2019Source: Enzyme and Microbial TechnologyAuthor(s): Pornpimol Phuengmaung, Yoichi Sunagawa, Yosuke Makino, Takafumi Kusumoto, Satoshi Handa, Wasana Sukhumsirichart, Tatsuji SakamotoAbstractWe previously described the fungus Penicillium chrysogenum 31B, which has high performance to produce the ferulic acid esterase (FAE) for de-esterifying ferulic acids (FAs) from sugar beet pulp. However, the characteristics of this fungus have not yet been determined. Therefore, in this study, we evaluated the molecular characteristics and natural substrate specificity of the Pcfae1 gene from Penicillium chrysogenum and examined its synergistic effects on sugar beet pectin. The Pcfae1 gene was cloned and overexpressed in Pichia pastoris KM71H, and the recombinant enzyme, named PcFAE1, was characterized. The 505 amino acids of PcFAE1 possessed a GCSTG motif (Gly164 to Gly168), characteristic of the serine esterase family. By comparing the amino acid sequence of PcFAE1 with that of the FAE (AoFaeB) of Aspergillus oryzae, Ser166, Asp379, and His419 were identified as the catalytic triad. PcFAE1 was purified through two steps using anion-exchange column chromatography. Its molecular mass without the signal peptide was 75 kDa. Maximum PcFAE1 activity was achieved at pH 6.0–7.0 and 50 °C. The enzyme was stable up to 37 °C and at a pH range of 3–8. PcFAE1 activity was only inhibited by Hg2+, and the enzyme had activity toward methyl FA, meth...
Source: Enzyme and Microbial Technology - Category: Biotechnology Source Type: research