The active site and substrate-binding mode of 1-aminocyclopropane-1- carboxylate oxidase determined by site-directed mutagenesis and comparative modelling studies

Young Sam Seo, Ahrim Yoo, Jinwon Jung, Soon Kee Sung, Dae Ryook Yang, Woo Taek Kim, Weon Tae Lee

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The active site and substrate-binding mode of MD-ACO1 (Malus domestica Borkh. 1-aminocyclopropane-1-carboxylate oxidase) have been determined using site-directed mutagenesis and comparative modelling methods. The MD-ACO1 protein folds into a compact jelly-roll motif comprised of eight α-helices, 12 β-strands and several long loops. The active site is well defined as a wide cleft near the C-terminus. The co-substrate ascorbate is located in cofactor Fe2+-binding pocket, the so-called '2-His-1-carboxylate facial triad'. In addition, our results reveal that Arg244 and Ser 246 are involved in generating the reaction product during enzyme catalysis. The structure agrees well with the biochemical and site-directed mutagenesis results. The three-dimensional structure together with the steady-state kinetics of both the wild-type and mutant MD-ACO1 proteins reveal how the substrate specificity of MD-ACO1 is involved in the catalytic mechanism, providing insights into understanding the fruit ripening process at atomic resolution.

Original languageEnglish
Pages (from-to)339-346
Number of pages8
JournalBiochemical Journal
Volume380
Issue number2
DOIs
Publication statusPublished - 2004 Jun 1

Fingerprint

Iron Regulatory Protein 1
Mutagenesis
Site-Directed Mutagenesis
Catalytic Domain
Malus
Substrates
Substrate Specificity
Catalysis
Fruit
Fruits
Reaction products
Enzymes
Kinetics
1-aminocyclopropane-1-carboxylic acid oxidase

All Science Journal Classification (ASJC) codes

  • Biochemistry

Cite this

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title = "The active site and substrate-binding mode of 1-aminocyclopropane-1- carboxylate oxidase determined by site-directed mutagenesis and comparative modelling studies",
abstract = "The active site and substrate-binding mode of MD-ACO1 (Malus domestica Borkh. 1-aminocyclopropane-1-carboxylate oxidase) have been determined using site-directed mutagenesis and comparative modelling methods. The MD-ACO1 protein folds into a compact jelly-roll motif comprised of eight α-helices, 12 β-strands and several long loops. The active site is well defined as a wide cleft near the C-terminus. The co-substrate ascorbate is located in cofactor Fe2+-binding pocket, the so-called '2-His-1-carboxylate facial triad'. In addition, our results reveal that Arg244 and Ser 246 are involved in generating the reaction product during enzyme catalysis. The structure agrees well with the biochemical and site-directed mutagenesis results. The three-dimensional structure together with the steady-state kinetics of both the wild-type and mutant MD-ACO1 proteins reveal how the substrate specificity of MD-ACO1 is involved in the catalytic mechanism, providing insights into understanding the fruit ripening process at atomic resolution.",
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The active site and substrate-binding mode of 1-aminocyclopropane-1- carboxylate oxidase determined by site-directed mutagenesis and comparative modelling studies. / Seo, Young Sam; Yoo, Ahrim; Jung, Jinwon; Sung, Soon Kee; Yang, Dae Ryook; Kim, Woo Taek; Lee, Weon Tae.

In: Biochemical Journal, Vol. 380, No. 2, 01.06.2004, p. 339-346.

Research output: Contribution to journalArticle

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