Abstract
The plant co-chaperones FK506-binding proteins (FKBPs) are peptidyl prolyl cis-trans isomerases that function in protein folding, signal transduction and chaperone activity. We report the characterization of the Arabidopsis large FKBPs ROF1 (AtFKBP62) and ROF2 (AtFKBP65) expression and protein accumulation patterns. Transgenic plants expressing ROF1 promoter fused to GUS reporter gene reveal that ROF1 expression is organ specific. High expression was observed in the vascular elements of roots, in hydathodes and trichomes of leaves and in stigma, sepals, and anthers. The tissue specificity and temporal expression of ROF1 and ROF2 show that they are developmentally regulated. Although ROF1 and ROF2 share 85% identity, their expression in response to heat stress is differentially regulated. Both genes are induced in plants exposed to 37 °C, but only ROF2 is a bonafide heat-stress protein, undetected when plants are grown at 22 °C. ROF1/ROF2 proteins accumulate at 37 °C, remain stable for at least 4 h upon recovery at 22 °C, whereas, their mRNA level is reduced after 1 h at 22 °C. By protein interaction assays, it was demonstrated, that ROF1 is a novel partner of HSP90. The five amino acids identified as essential for recognition and interaction between the mammalian chaperones and HSP90 are conserved in the plant ROF1-HSP90. We suggest that ROF/HSP90 complexes assemble in vivo. We propose that specific complexes formation between an HSP90 and ROF isoforms depends on their spatial and temporal expression. Such complexes might be regulated by environmental conditions such as heat stress or internal cues such as different hormones.
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Abbreviations
- FKBP:
-
FK506-binding protein
- PPIase:
-
Peptidyl prolyl cis-trans isomerase
- Cyp40:
-
Cyclophilin 40
- CsA:
-
Cyclosporin A
- TPR:
-
Tripartite tetratricopeptide repeats
- HOP:
-
HSP70 and HSP90 organizing protein
- FKBD:
-
FKBP12-like domain
- CaMBD:
-
Calmodulin binding domain
- GUS:
-
β-Glucoronidase
- HSP:
-
Heat shock protein
- PP5:
-
Protein phosphatase 5
- HSF:
-
Heat shock factor
- HSE:
-
Heat shock element
- STRE:
-
Stress response element
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Acknowledgment
This work was supported by a grant from the Israeli National Academy of Science to A. Breiman; by CONICET–PIP6167 and ANPCyT PICT2003/01–14123 to M. Galigniana; by FEBS short-term fellowship to K. Aviezer-Hagai. We thank Dedi Meiri for his generous contribution and fruitful discussions. We also thank Neomi Dafni for her technical help.
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Aviezer-Hagai, K., Skovorodnikova, J., Galigniana, M. et al. Arabidopsis immunophilins ROF1 (AtFKBP62) and ROF2 (AtFKBP65) exhibit tissue specificity, are heat-stress induced, and bind HSP90. Plant Mol Biol 63, 237–255 (2007). https://doi.org/10.1007/s11103-006-9085-z
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DOI: https://doi.org/10.1007/s11103-006-9085-z