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Updated: Nov 15, 2025
07:02
Exploring the Arginine Methylome by Nuclear Magnetic Resonance Spectroscopy
Published on: December 16, 2021
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Methylated HNRNPK acts on RPS19 to regulate ALOX15 synthesis in erythropoiesis
Isabel S Naarmann-de Vries1, Roberta Senatore1, Bodo Moritz2
1Department of Intensive Care Medicine, University Hospital, RWTH Aachen University, Aachen Germany.
Nucleic Acids Research
|March 4, 2021
Summary
HNRNPK protein regulates erythrocyte maturation by controlling ALOX15 synthesis. Its interaction with RPS19, crucial for ribosome assembly, is modulated by arginine dimethylation, impacting ALOX15 translation.
Area of Science:
- Cellular and Molecular Biology
- Hematopoiesis
- RNA Biology
Background:
- Post-transcriptional control is vital for reticulocyte maturation into erythrocytes.
- Arachidonate 15-lipoxygenase (ALOX15) initiates mitochondria degradation during terminal maturation.
- HNRNPK protein regulates ALOX15 synthesis, a key step in erythrocyte development.
Purpose of the Study:
- To elucidate the mechanism by which HNRNPK interferes with 80S ribosome assembly.
- To investigate the role of HNRNPK-RPS19 interaction in ALOX15 mRNA translation.
- To understand the regulation of HNRNPK-RPS19 interaction during erythroid maturation.
Main Methods:
- Three independent screens to identify HNRNPK interaction partners.
- In vitro and in vivo assays to study HNRNPK-RPS19 interaction.
- Analysis of HNRNPK arginine dimethylation during erythroid maturation of K562 cells.
Main Results:
- HNRNPK interacts differentially with RPS19, a component of the 40S ribosomal subunit.
- Decreasing arginine dimethylation of HNRNPK reduces its interaction with RPS19 during erythroid maturation.
- RPS19 depletion in K562 cells induces ALOX15 synthesis and mitochondria degradation.
- Residue W52 in RPS19, implicated in Diamond-Blackfan Anemia, is critical for HNRNPK binding.
Conclusions:
- HNRNPK-RPS19 interaction is regulated by HNRNPK arginine dimethylation.
- This interaction is critical for inhibiting ALOX15 translation and regulating erythrocyte maturation.
- Dysregulation of this interaction may contribute to pathologies like Diamond-Blackfan Anemia.
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