Abstract
Zinc-finger HIT belongs to the cross-brace zinc finger protein family and is involved in the regulation of plant defense and stress responses. In this study, we cloned a full-length zinc-finger HIT gene (1,377 bp) named SlPAPA1 using polymerase chain reaction from Suaeda liaotungensis K. and investigated its function by overexpression in transgenic Arabidopsis. SlPAPA1 contains a zinc-finger HIT domain and a Pim-1-associated protein-1 (PAP-1)-associated protein-1-like (PAPA-1-like) conserved region. Its expression in S. liaotungensis was induced by drought, high-salt, and cold (4 °C) stresses and by abscisic acid (ABA). Subcellular localization experiments in onion epidermal cells indicated that SlPAPA1 is localized in the nucleus. Yeast-one hybrid assays showed that SlPAPA1 functions as a transcriptional activator. SlPAPA1 transgenic Arabidopsis displayed a higher survival ratio and lower rate of water loss under drought stress; a higher germination ratio, higher survival ratio, and lower root inhibition rate under salt stress; and a lower germination ratio and root inhibition rate under ABA treatment, compared with wild-type Arabidopsis. These results suggested that SlPAPA1 functions as a stress-responsive zinc-finger HIT protein involved in the ABA-dependent signaling pathway and may have potential applications in transgenic breeding to enhance crops abiotic stress tolerances.
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Abbreviations
- ABA:
-
Abscisic acid
- bZIP:
-
Basic leucine zipper
- CBF:
-
Core binding factor
- DEAD:
-
The amino acid sequence Asp-Glu-Ala-Asp
- DREB:
-
Dehydration response element binding factor
- FON:
-
ZNHIT2 protein (zinc finger HIT domain-containing protein 2), encoded by the C11orf5 gene on chromosome 11q13–q22 from Homo sapiens
- GFP:
-
Green fluorescent protein
- HIT:
-
High temperature
- IGFBPs:
-
IGF-binding proteins
- MODY:
-
Maturity-onset diabetes of the young
- MYB:
-
Myeloblastosis
- NAC:
-
NAM (No Apical Meristem), ATAF1 or ATAF2 and CUC2 (cup-shaped cotyledon)
- ORF:
-
Open reading frame
- PAPA-1:
-
Pim-1-associated protein-1 (PAP-1)-associated protein-1
- PEG 6000:
-
Polyethylene glycol 6000
- PHD:
-
Plant homeodomain
- RSGI:
-
RIKEN structural genomics/proteomics initiative
- qRT-PCR:
-
Quantitative real-time polymerase chain reaction
- zf-HIT:
-
Zinc-finger HIT
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Acknowledgments
We would like to thank Dr Shaoming Tong (Liaoning Normal University) for kindly providing the pEGAD vector and seeds of Arabidopsis thaliana and Dr Qiao Su (Dalian University of Technology) for providing the GeneGun (GJ-1000, China). This work was supported by grants from the National Natural Science Foundation of China (No. 30871389) to Professor Qiuli Li.
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Li, Xl., Hu, Yx., Yang, X. et al. A Novel Zinc-Finger HIT Protein with an Additional PAPA-1-like Region from Suaeda liaotungensis K. Enhanced Transgenic Arabidopsis Drought and Salt Stresses Tolerance. Mol Biotechnol 56, 1089–1099 (2014). https://doi.org/10.1007/s12033-014-9789-2
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DOI: https://doi.org/10.1007/s12033-014-9789-2