IREN, a novel EF-hand motif-containing nuclease, functions in the degradation of nuclear DNA during the hypersensitive response cell death in rice

Bioscience, Biotechnology, and Biochemistry
Yuka OotsuboFang-Sik Che

Abstract

The hypersensitive response (HR), a type of programmed cell death that is accompanied by DNA degradation and loss of plasma membrane integrity, is a common feature of plant immune responses. We previously reported that transcription of IREN which encodes a novel EF-hand containing plant nuclease is controlled by OsNAC4, a key positive regulator of HR cell death. Transient overexpression of IREN in rice protoplasts also led to rapid DNA fragmentation, while suppression of IREN using RNA interference showed remarkable decrease of DNA fragmentation during HR cell death. Maximum DNA degradation associated with the recombinant IREN was observed in the presence of Ca(2+) and Mg(2+) or Ca(2+) and Mn(2+). Interestingly, DNA degradation mediated by the recombinant IREN was completely abolished by Zn(2+), even when Ca(2+), Mg(2+), or Mn(2+) were present in the reaction buffer. These data indicate that IREN functions in the degradation of nuclear DNA during HR cell death.

References

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Citations

Feb 24, 2017·Journal of Inorganic Biochemistry·Shailender Kumar VermaYusuf Akhter
Feb 24, 2021·Molecular Plant-microbe Interactions : MPMI

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Methods Mentioned

BETA
PCR
fluorescence microscopy
electrophoresis
fluorescence
nuclear translocation
nuclease assay

Software Mentioned

BLASTN
PSORT

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