Reference: Slocombe SP, et al. (2004) SNF1-related protein kinase (snRK1) phosphorylates class I heat shock protein. Plant Physiol Biochem 42(2):111-6

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Abstract


The nucleotide sequence of cBSnIP2, a cDNA that had been cloned from a barley (Hordeum vulgare) seed endosperm cDNA library by two-hybrid screening with barley SNF1-related protein kinase (SnRKI) was determined. It was found to contain a complete open reading frame encoding a class I heat shock protein. Transcripts corresponding to the cDNA (renamed cBHSP17) were detectable in RNA isolated from barley seeds harvested in mid-development but not RNA from roots or leaves. BHSP17 protein was expressed in Escherischia coli and shown to be phosphorylated by SnRKI from barley endosperm and spinach leaf. It was found to be a less effective substrate than 3-hydroxy-3-methylglutaryl-Coenzyme A, a previously identified substrate of SnRK1. However, a specific phosphorylation site at serine-35 was identified by solid phase sequencing of RP-HPLC-purified peptides after phosphorylation by spinach SnRK1.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Slocombe SP, Beaudoin F, Donaghy PG, Hardie DG, Dickinson JR, Halford NG
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