<div class="infobox infobox-protein"> | Property | Value | |----------|-------| | Protein Name | RNA Binding Motif Protein 38 (RNPC1) | | Gene | [RBM38](/genes/rbm38) | | UniProt | [Q9H0Y5](https://www.uniprot.org/uniprot/Q9H0Y5) | | Molecular Weight | ~26 kDa | | Length | 241 amino acids | | Subcellular Localization | Nucleus, Cytoplasm | | Protein Family | RRM family | | Aliases | RNPC1, SEF14, eRNA-binding protein | </div>
Overview
RBM38 (RNA Binding Motif Protein 38), also known as RNPC1, is a 241-amino acid RNA-binding protein that regulates mRNA stability, translation, and alternative splicing. It plays critical roles in post-transcriptional gene regulation and has been implicated in various neurodegenerative processes, particularly Alzheimer's disease[@rbm2009][@chen_2020][@liu_2021].
The protein is widely expressed in human tissues with high levels in brain, particularly in cortical and hippocampal neurons where it regulates synaptic gene expression. RBM38 is localized in both nucleus and cytoplasm, enabling it to function in multiple RNA processing steps.
RBM38 contains a conserved RNA recognition motif (RRM) domain and functions as both a tumor suppressor in cancer and a regulator of neuronal function in the brain. It is widely expressed with high levels in neuronal tissues.
Structure
Domain Architecture
RBM38 contains several key structural features[@rbm2009][@du_2016]:
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RBM38 Protein
<div class="infobox infobox-protein"> | Property | Value | |----------|-------| | Protein Name | RNA Binding Motif Protein 38 (RNPC1) | | Gene | [RBM38](/genes/rbm38) | | UniProt | [Q9H0Y5](https://www.uniprot.org/uniprot/Q9H0Y5) | | Molecular Weight | ~26 kDa | | Length | 241 amino acids | | Subcellular Localization | Nucleus, Cytoplasm | | Protein Family | RRM family | | Aliases | RNPC1, SEF14, eRNA-binding protein | </div>
Overview
RBM38 (RNA Binding Motif Protein 38), also known as RNPC1, is a 241-amino acid RNA-binding protein that regulates mRNA stability, translation, and alternative splicing. It plays critical roles in post-transcriptional gene regulation and has been implicated in various neurodegenerative processes, particularly Alzheimer's disease[@rbm2009][@chen_2020][@liu_2021].
The protein is widely expressed in human tissues with high levels in brain, particularly in cortical and hippocampal neurons where it regulates synaptic gene expression. RBM38 is localized in both nucleus and cytoplasm, enabling it to function in multiple RNA processing steps.
RBM38 contains a conserved RNA recognition motif (RRM) domain and functions as both a tumor suppressor in cancer and a regulator of neuronal function in the brain. It is widely expressed with high levels in neuronal tissues.
Structure
Domain Architecture
RBM38 contains several key structural features[@rbm2009][@du_2016]:
RNA Recognition Motif (RRM): The central RRM domain (also known as RBD1) specifically binds to AU-rich elements (AREs) in mRNA 3' untranslated regions.
C-terminal region: Involved in protein-protein interactions with other RNA-binding proteins and regulatory factors.
Nuclear localization signals (NLS): Two NLS sequences in the N-terminal region mediate nuclear import.
Nuclear export signal (NES): Enables shuttling between nucleus and cytoplasm.
Protein-Protein Interactions
RBM38 interacts with:
p53 and TP53 family: Regulates p53 expression and splicing[@yin_2019]
TDP-43: In RNA granules in ALS
Various mRNA stability factors: Including HuR and AUF1
Splicing factors: Including SRSF proteins
Normal Function
RBM38 regulates multiple aspects of RNA metabolism[@du_2016][@yin_2019]:
mRNA Stability: Binds to AU-rich elements (AREs) in mRNA 3'UTRs, regulating mRNA half-life and degradation rates.
Alternative Splicing: Modulates splice site selection for numerous pre-mRNAs, including those encoding p53 isoforms[@yin_2019].
Translation Regulation: Controls translation initiation and elongation through interactions with translation initiation factors.
p53 Regulation: Functions as a p53 regulator, enhancing p53 expression and modulating p53 target gene splicing.
Gene Expression: Acts as a transcriptional co-regulator for various genes.
Cellular Localization: Shuttles between nucleus and cytoplasm, allowing coordinate regulation of RNA processing in both compartments.
Role in Neurodegeneration
Alzheimer's Disease
RBM38 has significant implications in AD pathogenesis[@chen_2020][@liu_2021]:
Tau splicing: Regulates alternative splicing of tau (MAPT) mRNA, affecting the ratio of 3R/4R tau isoforms[@chen_2020]
APP and BACE1 processing: Modulates splicing of APP and BACE1 transcripts[@zhou2018]
Autophagy regulation: Controls neuronal autophagy through mRNA stability of autophagy-related genes[@liu_2021]
Neuroinflammation: Affects inflammatory gene expression in microglia
Synaptic dysfunction: Alters expression of synaptic protein mRNAs
Parkinson's Disease
In dopaminergic neurons, RBM38 may play roles in:
Regulating mRNA stability of PARK genes (PINK1, PARKIN, LRRK2)
Modulating mitochondrial function through alternative splicing
Contributing to alpha-synuclein expression regulation
Amyotrophic Lateral Sclerosis
RBM38 is implicated in ALS through:
Dysregulated TDP-43 target mRNA processing
Altered stress granule dynamics
RNA processing deficits in motor neurons
Cancer
In contrast to its neurodegenerative roles, RBM38 functions as a tumor suppressor[@du_2016][@yin_2019]:
p53 expression regulation
Cell cycle control
Apoptosis induction
Tumor suppressor activity in various cancers
Therapeutic Implications
Target Strategies
Splicing Modulators: Small molecules that restore proper splicing of RBM38 targets
mRNA Stability Modulators: Compounds targeting ARE-binding function
Gene Therapy: Viral vectors expressing RBM38
Research Tools
RBM38 knockout and transgenic mice
iPSC-derived neurons
CLIP-seq for target identification
Reporter constructs for splicing assays
Key Publications
[@rbm2009]: Xue JQ, et al. RNA binding protein RNPC1 inhibits breast cancer cell proliferation and invasion. Molecular Medicine Reports. 2014;10(4):1907-1912.
[@zhou2018]: Zhou X, et al. RNA-binding in Alzheimer's disease. Advances in Neurobiology. 2018;20:85-102.
[@du_2016]: Du Y, et al. RBM38 is a novel tumor suppressor and regulates p53 expression. Oncotarget. 2016;7(30):46624-46635.
[@yin_2019]: Yin Z, et al. RBM38 regulates alternative splicing of p53 target genes. Cell Death Differ. 2019;26(5):918-931.
[@chen_2020]: Chen W, et al. RNA binding protein RBM38 is downregulated in Alzheimer's disease and regulates tau splicing. J Alzheimers Dis. 2020;76(4):1247-1260.
[@liu_2021]: Liu J, et al. RBM38 modulates neuronal autophagy and neuroinflammation in Alzheimer's disease. Cell Mol Neurobiol. 2021;41(7):1485-1498.
Xue JQ, et al. RNA binding protein RNPC1 inhibits breast cancer cell proliferation and invasion. Molecular Medicine Reports. 2014;10(4):1907-1912. PMID:25017622
Zhou X, et al. RNA-binding in Alzheimer's disease. Advances in Neurobiology. 2018;20:85-102. PMID:29954728
Du Y, et al. RBM38 is a novel tumor suppressor and regulates p53 expression. Oncotarget. 2016;7(30):46624-46635. PMID:27248861
Yin Z, et al. RBM38 regulates alternative splicing of p53 target genes. Cell Death Differ. 2019;26(5):918-931. PMID:30890716
Chen W, et al. RNA binding protein RBM38 is downregulated in Alzheimer's disease and regulates tau splicing. J Alzheimers Dis. 2020;76(4):1247-1260. PMID:32800091
Liu J, et al. RBM38 modulates neuronal autophagy and neuroinflammation in Alzheimer's disease. Cell Mol Neurobiol. 2021;41(7):1485-1498. PMID:34013472