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enzyme annotation for orphan reactions and its applications in biomanufacturing

Green Chemical Engineering 2023年第2期4卷 137-145页

作者： Zhen Zhang Chun Li Key Lab for Industrial Biocatalysis Ministry of EducationDepartment of Chemical EngineeringTsinghua UniversityBeijing100084China Center for Synthetic&Systems Biology Department of Chemical EngineeringTsinghua UniversityBeijing100084China

There are lots of biochemical reactions in the biosynthetic pathway without associated enzymes.Reactions predicted by retro-biosynthetic tools are not assigned gene sequences.Besides,non-natural reactions designed with novel functions also lack suitable enzymes.All these reactions can be categorized as orphan reactions.The absence of protein-encoding genes in these orphan reactions limits their direct experimental implementation.Computational tools have been developed to find candidate enzymes for these orphan reactions.Herein,we discuss recent advances in these computational tools,including reaction similarity-based methods for calculating the substructural similarity between orphan reactions and known enzymatic reactions;sequence-based tools combine metabolic knowledge base and phenotypic information with genomic,transcriptomic,and metabolomic data to mine appropriate enzymes for orphan reactions;and approaches based on the creation of enzyme variants for orphan reactions as enzyme engineering modifications and de novo design of enzymes.We believe that our review will greatly facilitate the design of microbial cell factories and contribute to the development of the biomanufacturing field.

关键词： enzyme annotation Orphan reactions Reaction similarity Gene mining Computational enzyme design

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