Abstract
Although plant actins have highly conserved sequences, they are classified as vegetative or reproductive actin based on genetic relationship and the role of the tissue. To characterize the 1,590 bp actin (ACT) gene cloned from the petals of the Ascocenda Princess Mikasa ‘Blue’ orchid, the encoded protein sequence of Ascocenda ACT was aligned to 31 related proteins from orchids and other plant species. The comparison of the amino acids of the actin proteins showed that Ascocenda ACT1, Cymbidium ACT, Phalaenopsis ACT1, Phalaenopsis ACT2, and Phalaenopsis ACT4 contained 13 positions different in amino acid residues in actin polypeptides. Consequently, Ascocenda ACT, Cymbidium ACT, and Phalaenopsis ACT2 were classified as vegetative actins. The classification of Ascocenda ACT was consistent with the results of qualtitative real-time polymerase chain reaction (qPCR) analysis, which demonstrated that actin is highly expressed in all vegetative tissues of the Ascocenda orchid but not in pollen. The predicted three-dimensional structure of the orchid actins revealed that most of the 13 variable residues were located outside the dynamic functional loops, with the exception of Thr16 and Pro353, which were located in the S-loop and target binding site of Ascocenda ACT, respectively. We suggest that the DNA sequence in actin may play a role in the functions of each actin isoform in a tissue-specific manner.
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Abbreviations
- ACT:
-
Actin
- D-loop:
-
DNase-I binding loop
- G-actin:
-
Globular actin
- H-loop:
-
Histidine-loop
- S-loop:
-
Serine-loop
- W-loop:
-
Tryptophan-loop
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Acknowledgments
This project was supported by the Science Achievement Scholarship of Thailand (SAST) contract no.02/2551, Chulabhorn Research Institute (CRI) and Kasetsart University Research and Development Institute (KURDI), Thailand.
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Pangjai, W., Huehne, P.S. Variable amino acid sequences in the S-loop and target binding site of vegetative actin in flowers of the Ascocenda orchid. J. Plant Biochem. Biotechnol. 24, 408–416 (2015). https://doi.org/10.1007/s13562-014-0291-5
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DOI: https://doi.org/10.1007/s13562-014-0291-5