Matsuzawa T, Kameyama A, Yaoi K. A novel isoprimeverose-producing enzyme from
Phaeoacremonium minimum is active with low concentrations of xyloglucan oligosaccharides.
FEBS Open Bio 2018;
9:92-100. [PMID:
30652077 PMCID:
PMC6325624 DOI:
10.1002/2211-5463.12549]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 10/18/2018] [Accepted: 10/30/2018] [Indexed: 11/12/2022] Open
Abstract
Xyloglucan is one of the major polysaccharides found in the plant cell wall and seeds. Owing to its complex branched structure, several different hydrolases are required to degrade it. Isoprimeverose‐producing enzymes (IPase) are unique among the glycoside hydrolase 3 family in that they recognize and release a disaccharide from the nonreducing end of xyloglucan oligosaccharides. Only two IPases have been previously isolated and characterized. A novel IPase from Phaeoacremonium minimum (PmIPase) was expressed and characterized. The xylopyranosyl residue at the nonreducing end of xyloglucan oligosaccharides was essential for hydrolytic activity, and PmIPase was unable to hydrolyze cellobiose into d‐glucose. PmIPase had a Km for xyloglucan oligosaccharide substrate that was much lower than that of the reported IPase isolated from Aspergillus oryzae. This indicates that PmIPase was able to produce isoprimeverose efficiently from low concentrations of xyloglucan oligosaccharides. PmIPase also exhibited transglycosylation activity and was able to transfer isoprimeverose units to its substrates.
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