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Updated: May 20, 2026
10:17
A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors
Published on: April 29, 2022
Phosphatase activity in barley proteins tightly bound to DNA and its development-dependent changes
K Bielskienė1, D Labeikytė, N Sjakste
1Laboratory of Molecular Oncology, Institute of Oncology, Vilnius University, P. Baublio 3b, Vilnius LT-08406, Lithuania.
Biochemistry. Biokhimiia
|July 24, 2012
Summary
Tightly bound proteins (TBPs) in barley exhibit varied spectra across organs and developmental stages. These proteins, including transcription factors and enzymes, play roles in chromatin regulation and possess potential phosphatase activity.
Area of Science:
- Molecular Biology
- Plant Biochemistry
- Proteomics
Background:
- Tightly bound proteins (TBPs) are DNA-associated proteins found in eukaryotes.
- Some mammalian and yeast TBPs exhibit phosphatase or kinase activity.
Purpose of the Study:
- To further characterize tightly bound proteins (TBPs) in barley (Hordeum vulgare) cells.
- To investigate the diversity and potential enzymatic activities of barley TBPs.
Main Methods:
- Analysis of TBP spectra in different barley organs (leaves, coleoptile, roots).
- Assessment of TBP activity at various plant developmental stages.
- Identification of barley TBPs using MALDI-TOF mass spectrometry.
Main Results:
- TBP spectra differed across barley organs and developmental stages.
- Some barley TBPs demonstrated phosphatase activity, potentially Ser/Thr or dual Ser/Thr/Tyr.
- Identified TBPs include transcription factors, serpins, phosphatases, kinases, RNA helicases, and DNA topoisomerase II, involved in chromatin regulation.
Conclusions:
- Barley TBPs are diverse and vary with tissue type and plant age.
- Barley TBPs possess enzymatic activities and are implicated in crucial cellular processes like chromatin remodeling and gene regulation.
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