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Sucrose non-fermenting 1-related protein kinase 2 (SnRK2): a family of protein kinases involved in hyperosmotic stress signaling

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Abstract

Our understanding of plant adaptation to abiotic stresses, which include drought, salinity, non-optimal temperatures and poor soil nutrition, is limited, although significant strides have been made in identifying some of the gene players and signaling partners. Several protein kinases get activated in plants in response to osmotic stress and the stress hormone abscisic acid (ABA). Among these is a superfamily of sucrose non-fermenting protein kinase genes (SnRK2). This review focuses on the developments related to the activity, substrates, interacting proteins and gene regulation of SnRK2 gene family members. Reversible phosphorylation as a crucial regulatory mechanism turns out to be a rule rather than an exception in plant responses to abiotic stress. Nine out of thirteen bZIP transcription factors (ABI5/ABF/AREB family) share the recognition motif, R-Q-X-S/T, suggesting that likely SnRK2 kinases have a major role in regulating gene expression during hyperosmotic stress.

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Abbreviations

ABRE:

ABA responsive element (CACGTGGC)

G box:

core sequence ACGT in CCACGTGG, TGACGTGG

CE:

coupling elements (CE1: TGCCACCGG; CE3: ACGCGTGTC)

ABF:

ABRE binding factors

bZIP:

protein containing a basic amino acid enriched region adjacent to a leucine zipper

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  1. Sustainable Agricultural Systems Laboratory, USDA-ARS, The Henry A. Wallace Beltsville Agricultural Research Center, Building 001, Beltsville, MD, 20705-2350, USA

    Vijaya Shukla & Autar K. Mattoo

  2. Center for Biosystems Research, University of Maryland Biotechnology Institute, College Park, MD, 20742, USA

    Vijaya Shukla

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  1. Vijaya Shukla
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Shukla, V., Mattoo, A.K. Sucrose non-fermenting 1-related protein kinase 2 (SnRK2): a family of protein kinases involved in hyperosmotic stress signaling. Physiol Mol Biol Plants 14, 91–100 (2008). https://doi.org/10.1007/s12298-008-0008-0

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