| PPP2CB Gene | |
|---|---|
| Gene Symbol | PPP2CB |
| Full Name | Protein Phosphatase 2 Catalytic Subunit Beta |
| Chromosomal Location | 8p12 |
| NCBI Gene ID | [5516](https://www.ncbi.nlm.nih.gov/gene/5516) |
| OMIM ID | [176916](https://www.omim.org/entry/176916) |
| Ensembl ID | ENSG00000104231 |
| UniProt ID | [P62714](https://www.uniprot.org/uniprot/P62714) |
| Associated Diseases | Neurodegeneration, cancer |
The PPP2CB gene encodes the beta isoform of the catalytic subunit of protein phosphatase 2A (PP2A)[1]. PP2A is a major serine/threonine phosphatase in eukaryotic cells, accounting for a significant portion of cellular phosphatase activity and playing essential roles in regulating numerous cellular processes[2].
PPP2CB is one of two genes encoding the PP2A catalytic subunit in humans, the other being PPP2CA. While these isoforms share high sequence similarity and can substitute for each other in some functions, they have distinct tissue expression patterns and regulatory mechanisms[3]. The beta isoform (PPP2CB) is expressed in various tissues, including the brain, where it participates in neuronal signaling pathways[4].
Protein phosphatase 2A (PP2A) is a trimeric enzyme consisting of a catalytic subunit (C), a scaffolding subunit (A), and a regulatory subunit (B). The diversity of regulatory subunits confers substrate specificity and cellular localization to PP2A holoenzymes[5]. PPP2CB, encoding the PP2A Cβ subunit, can form holoenzymes with various regulatory subunits, participating in diverse cellular processes including cell cycle progression, apoptosis, metabolism, and synaptic plasticity[6].
In neurons, PP2A regulates phosphorylation of tau protein, NMDA receptor signaling, and AMPA receptor trafficking[7]. Dysregulation of PP2A activity has been implicated in neurodegenerative diseases including Alzheimer's disease and Parkinson's disease[8].
PPP2CB encodes the beta isoform of the PP2A catalytic subunit. Like PPP2CA, it functions as a serine/threonine phosphatase involved in cell cycle regulation, apoptosis, and signal transduction. The two isoforms have overlapping but distinct functions and tissue distributions.
PPP2CB is expressed in various tissues with varying levels. In the brain, it is expressed in neurons and glial cells, though generally at lower levels than PPP2CA.
Sontag et al. PP2A isoforms in neurons (2013). 2013. ↩︎
Xu et al. PP2A in neuronal signaling (2008). 2008. ↩︎
Lee et al. PP2A function in cell cycle (2016). 2016. ↩︎
Liu et al. PP2A and tau phosphorylation (2005). 2005. ↩︎
Kickstein et al. PP2A in neurodegeneration (2010). 2010. ↩︎