The Zea Mays Glycine-rich RNA-binding Protein MA16 is Bound to a Ribonucleotide(s) by a Stable Linkage

Overview

Journal J Plant Res

Specialty Biology

Date 2012 Jan 25

PMID 22270696

Citations 3

Authors

Miguel Angel Freire

Affiliations

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Abstract

Expression of the gene encoding the maize glycine-rich RNA-binding protein MA16 is developmentally regulated and it is involved in environmental stress responses. The MA16 protein shows a wide spectrum of RNA-binding activities. On the basis of in vivo labelling, where a [³²P]phosphate label was linked to the MA16 protein, Freire and Pages (Plant Mol Biol 29:797-807, 1995) suggested that the protein may be post-translationally modified by phosphorylation. However, further analysis showed that the [³²P]phosphate label was sensitive to different treatments, suggesting that modification distinct from protein phosphorylation might occur in the MA16 protein. Biochemical analysis revealed that this [³²P]phosphate labelling was resistant to phenol extraction and denaturing SDS-PAGE but sensitive to micrococcal nuclease, RNase A and RNase T1 treatments. The mobility of [³⁵S] labelled MA16 protein on SDS-PAGE did not significantly changed after the nuclease treatments suggesting that the [³²P]phosphate label associated to MA16 protein could be a ribonucleotide or a very short ribonucleotide chain. In addition, immunoprecipitation of labelled extracts showed that the ribonucleotide(s) linked to the MA16 protein was removed by phosphorolytic activity. This activity could be catalysed by a phosphate-dependent ribonuclease. The C-terminus of MA16 protein harbouring a glycine-rich domain was predicted to be an intrinsically disordered region.

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