Proteomics

Dataset Information

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Identification of autophosphorylationsites in recombinant Saccharomyces cerevisiae Ire1


ABSTRACT: This study reports autophosphorylation sites in the serine/threonine protein kinase Ire1. The cytosolic portion of Ire1 was expressed as an glutathione S transferase fusion protein in Escherichia coli. Phosphroyaltion sites in the recombinant wild type protein and a L745A mutant were mapped by mass spectrometry. Phosphorylation sites map of the activation loop in the protein kinase domain and the alphaEF-alphaF insertion loop. In the activation loop phosphorylation was observed at serine 837, serine 840, serine 844, and threonine 844. Phosphorylaton was also observed at serine 850 in the P+1 loop. In the alphaEF-alphaF insertion loop phosphorylation was observed at threonine 873, serine 877, serine 878, threonine 881, serine 884, serine 885, and serine 887.

INSTRUMENT(S): LTQ Orbitrap

ORGANISM(S): Saccharomyces Cerevisiae (baker's Yeast)

SUBMITTER: Martin Schroeder  

LAB HEAD: Martin Schröder

PROVIDER: PXD004924 | Pride | 2017-06-09

REPOSITORIES: pride

Dataset's files

Source:
Action DRS
100526_07_PR10_0021_L745A.RAW Raw
100527_05_PR10_0021_WT.RAW Raw
GPM28700000059.xml Xml
GPM28700000061.xml Xml
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Publications

Bypass of Activation Loop Phosphorylation by Aspartate 836 in Activation of the Endoribonuclease Activity of Ire1.

Armstrong Michael C MC   Šestak Sergej S   Ali Ahmed A AA   Sagini Hanan A M HAM   Brown Max M   Baty Karen K   Treumann Achim A   Schröder Martin M  

Molecular and cellular biology 20170728 16


The bifunctional protein kinase-endoribonuclease Ire1 initiates splicing of the mRNA for the transcription factor Hac1 when unfolded proteins accumulate in the endoplasmic reticulum. Activation of <i>Saccharomyces cerevisiae</i> Ire1 coincides with autophosphorylation of its activation loop at S840, S841, T844, and S850. Mass spectrometric analysis of Ire1 expressed in <i>Escherichia coli</i> identified S837 as another potential phosphorylation site <i>in vivo</i> Mutation of all five potential  ...[more]

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