Biologia Plantarum

, Volume 60, Issue 4, pp 715–723 | Cite as

Cloning, characterization, and subcellular localization of a novel JAZ repressor from Eleusine coracana

  • S. Sen
  • S. K. Dutta
Original Paper


Jasmonate ZIM domain (JAZ) proteins are key regulators of the jasmonic acid (JA) signaling pathway. Repressors of JAZ remain bound to the myelocytomatosis 2 (MYC2) or MYC3/MYC4 transcription factors in the absence of JA and negatively regulate transcription of the JA responsive genes. In the presence of JA, JAZ proteins interact with coronative insensitive 1 (COI1), the recognition molecule of E3 ubiquitin ligase SCFCOI1 (COI1 stabilized by Skp, cullin, F-box containing complex), get ubiquitinated, and subsequently degraded by the 26S proteasome. However, there is a dearth of knowledge about this gene family in monocot cereals, specifically its role in finger millet is unknown till date. Here we present the isolation and characterization of a novel JAZ family repressor gene from nonsequenced Eleusine coracana (EcJAZ) utilizing available genome information of Oryza, Sorghum, and Setaria. The EcJAZ sequence showed the presence of a conserved ZIM domain, the Jas motif, and N-terminal motif 7 like other Group1 TIFY sequence containing proteins. We observed coronatine (an analog of JA-Ile) dependent and time dependent degradation of recombinant EcJAZ that thereby fulfilled the basic characteristic of the JAZ proteins. We found a proteasome inhibitor N-(phenylmethoxy) carbonyl-L-leucyl-N-[(1R)-1-formyl-3-methylbutyl]-L-leucinamide) (MG132) mediated degradation inhibition of EcJAZ that supported its 26S proteasome mediated degradation. Our study shows the nuclear localization of GFP-EcJAZ by Agrobacterium mediated transient transformation of onion scale epidermal cells. In Eleusine leaves, transcription of EcJAZ increased 4.2-fold by salt stress and 5.5-fold by coronatine application; thus ascertained its inducibility by the abiotic stress as well as by bioactive JA-Ile. Taken together, all these results contribute to our understanding of the JA signaling pathway in Eleusine coracana.

Additional key words

Agrobacterium transformation coronatine finger millet jasmonic acid salt stress 



abscisic acid


coronatine insensitive 1


green fluorescence protein




jasmonic acid


jasmonate ZIM domain


methyl jasmonate


N-(phenylmethoxy) carbonyl-L-Leucyl-N-[(1R)-1-formyl-3-methylbutyl]-L-leucinamide




restriction endonuclease


COI1 stabilized by Skp, Cullin, F-box containing complex


conserved TIFY sequence containing protein


zinc finger protein expressed in inflorescence meristem


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Supplementary material

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© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Drug Development/Diagnostics and Biotechnology DivisionCSIR - Indian Institute of Chemical BiologyKolkataIndia

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