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2014 ; 30
(12
): i165-74
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Metabolome-scale prediction of intermediate compounds in multistep metabolic
pathways with a recursive supervised approach
#MMPMID24931980
Kotera M
; Tabei Y
; Yamanishi Y
; Muto A
; Moriya Y
; Tokimatsu T
; Goto S
Bioinformatics
2014[Jun]; 30
(12
): i165-74
PMID24931980
show ga
MOTIVATION: Metabolic pathway analysis is crucial not only in metabolic
engineering but also in rational drug design. However, the
biosynthetic/biodegradation pathways are known only for a small portion of
metabolites, and a vast amount of pathways remain uncharacterized. Therefore, an
important challenge in metabolomics is the de novo reconstruction of potential
reaction networks on a metabolome-scale. RESULTS: In this article, we develop a
novel method to predict the multistep reaction sequences for de novo
reconstruction of metabolic pathways in the reaction-filling framework. We
propose a supervised approach to learn what we refer to as 'multistep reaction
sequence likeness', i.e. whether a compound-compound pair is possibly converted
to each other by a sequence of enzymatic reactions. In the algorithm, we propose
a recursive procedure of using step-specific classifiers to predict the
intermediate compounds in the multistep reaction sequences, based on chemical
substructure fingerprints/descriptors of compounds. We further demonstrate the
usefulness of our proposed method on the prediction of enzymatic reaction
networks from a metabolome-scale compound set and discuss characteristic features
of the extracted chemical substructure transformation patterns in multistep
reaction sequences. Our comprehensively predicted reaction networks help to fill
the metabolic gap and to infer new reaction sequences in metabolic pathways.
AVAILABILITY AND IMPLEMENTATION: Materials are available for free at
http://web.kuicr.kyoto-u.ac.jp/supp/kot/ismb2014/