Abstract
1-aminocyclopropane-1-carboxylic acid oxidase (ACO) enzyme is a member of the Fe II-dependent family of oxidases/oxygenases which require Fe2+ as a cofactor, ascorbate as a cosubstrate and CO2 as an activator. This enzyme catalyses the terminal step in the plant signaling of ethylene biosynthetic pathway. A 948 bp fragment of the ACO1 gene cDNA sequence was cloned from tomato (Lycopersicon esculentum) fruit tissues by using reverse transcriptase-polymerase chain reaction (RT-PCR) with two PCR primers designed according to the sequence of a tomato cDNA clone (X58273). The BLAST search showed a high level of similarity (77–98 %) between ACO1 and ACO genes of other plants. The calculated molecular mass and predicted isoelectric point of LeACO1 were 35.8 kDa and 5.13, respectively. The three-dimensional structure studies illustrated that the LeACO1 protein folds into a compact jelly-roll motif comprised of 8 α-helices, 12 β-strands and several long loops. The cosubstrate was located in a cofactor-binding pocket referred to as a 2-His-1-carboxylate facial triad. Semi-quantitative RT-PCR analysis of gene expression revealed that the LeACO1 was expressed in fruit tissues at different ripening stages.
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Abbreviations
- ACC:
-
1-Aminocyclopropane-1-carboxylic acid
- ACO:
-
ACC oxidase
- ACS:
-
ACC synthase
- SAM:
-
S-adenosylmethionine
- ORF:
-
Open reading frame
- RT-PCR:
-
Reverse transcription polymerase chain reaction
- Bp:
-
Base pair
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Jafari, Z., Haddad, R., Hosseini, R. et al. Cloning, identification and expression analysis of ACC oxidase gene involved in ethylene production pathway. Mol Biol Rep 40, 1341–1350 (2013). https://doi.org/10.1007/s11033-012-2178-7
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DOI: https://doi.org/10.1007/s11033-012-2178-7