Molecular Characterization of Cold-responsive Basic Helix-loop-helix Transcription Factors MabHLHs That Interact with MaICE1 in Banana Fruit

Overview

Journal Planta

Specialty Biology

Date 2013 Aug 20

PMID 23955147

Citations 23

Authors

Huan-huan Peng

Wei Shan

Jian-Fei Kuang

Wang-Jin Lu

Jian-Ye Chen

Affiliations

Soon will be listed here.

Abstract

Basic helix-loop-helix (bHLH) transcription factors (TFs) are ubiquitously involved in the response of higher plants to various abiotic stresses. However, little is known about bHLH TFs involved in the cold stress response in economically important fruits. Here, five novel full-length bHLH genes, designated as MabHLH1-MabHLH5, were isolated and characterized from banana fruit. Gene expression profiles revealed that MabHLH1/2/4 were induced by cold stress and methyl jasmonate (MeJA) treatment. Transient assays in tobacco BY2 protoplasts showed that MabHLH1/2/4 promoters were activated by cold stress and MeJA treatments. Moreover, protein-protein interaction analysis demonstrated that MabHLH1/2/4 not only physically interacted with each other to form hetero-dimers in the nucleus, but also interacted with an important upstream component of cold signaling MaICE1, with different interaction domains at their N-terminus. These results indicate that banana fruit cold-responsive MabHLHs may form a big protein complex in the nucleus with MaICE1. Taken together, our findings advance our understanding of the possible involvement of bHLH TFs in the regulatory network of ICE-CBF cold signaling pathway.

Citing Articles

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