Phylogenetic analysis and substrate specificity of GH2 β-mannosidases from Aspergillus species.

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Abstract

Phylogenetic analysis of glycoside hydrolase family 2 including Aspergillus sequences and characterised β-mannosidases from other organisms, clusters putative Aspergillus β-mannosidases in two distinct clades (A and B). Aspergillus species have at least one paralog in each of the two clades. It appears that clade A members are extracellular and clade B members intracellular. Substrate specificity analysis of MndA of Aspergillus niger (clade A) and MndB of Aspergillus nidulans (clade B) show that MndB, in contrast to MndA, does not hydrolyse polymeric mannan and has probably evolved to hydrolyse small unbranched β-mannosides like mannobiose. A 3D-model of MndB provides further insight.

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  • Biological Sciences
Original languageEnglish
Pages (from-to)3444-3449
JournalFEBS Letters
Volume587
Issue number21
Publication statusPublished - 2013
Publication categoryResearch
Peer-reviewedYes

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