Subtopic Deep Dive
Hippo Pathway Core Kinase Cascade
Research Guide
What is Hippo Pathway Core Kinase Cascade?
The Hippo Pathway Core Kinase Cascade comprises the sequential activation of MST1/2-SAV1 and LATS1/2-MOB1 kinases that phosphorylate YAP/TAZ to inhibit their transcriptional activity and control organ size.
This cascade transmits upstream signals through MST1/2 phosphorylating LATS1/2, which then phosphorylates YAP at Ser127 and TAZ to sequester them in the cytoplasm (Zhao et al., 2007; 3075 citations). Scaffold proteins SAV1 and MOB1 enhance kinase interactions and efficiency (Meng et al., 2016; 1674 citations). Over 10 key papers from 2007-2016 detail these phosphorylation dynamics and feedback loops.
Why It Matters
Core kinase cascade modulation targets YAP/TAZ hyperactivity in cancers, as LATS1/2 phosphorylation regulates YAP stability via SCFβ-TRCP (Zhao et al., 2010; 1406 citations). In organ size control, MST1/2-SAV1 activation prevents excessive proliferation, with dysregulation linked to tumorigenesis (Zhao et al., 2010; 1123 citations). Therapeutic inhibition of this cascade shows promise in liver and breast cancer models, enabling precise signal intervention (Yu and Guan, 2013; 1215 citations).
Key Research Challenges
Feedback Loop Complexity
Interconnected positive and negative feedbacks between MST1/2, LATS1/2, and YAP/TAZ complicate signal prediction (Meng et al., 2016). Quantitative modeling struggles with context-dependent strengths. Phosphorylation site crosstalk remains unresolved (Zhao et al., 2010).
Scaffold Regulation Dynamics
SAV1 and MOB1 scaffolds vary by cell type, affecting kinase efficiency (Yu and Guan, 2013). Structural changes upon binding are poorly characterized. Isoform-specific roles evade standard assays (Lei et al., 2008).
Phosphorylation Site Specificity
Multiple YAP/TAZ sites (e.g., Ser127) show overlapping LATS/CK1 effects, hindering selective inhibition (Zhao et al., 2010). Kinase-substrate fidelity varies with upstream inputs. Mass spec data reveals unannotated sites (Zhao et al., 2007).
Essential Papers
Inactivation of YAP oncoprotein by the Hippo pathway is involved in cell contact inhibition and tissue growth control
Bin Zhao, Xiaomu Wei, Weiquan Li et al. · 2007 · Genes & Development · 3.1K citations
The Hippo pathway plays a key role in organ size control by regulating cell proliferation and apoptosis in Drosophila . Although recent genetic studies have shown that the Hippo pathway is regulate...
Mechanisms of Hippo pathway regulation
Zhipeng Meng, Toshiro Moroishi, Kun‐Liang Guan · 2016 · Genes & Development · 1.7K citations
The Hippo pathway was initially identified in Drosophila melanogaster screens for tissue growth two decades ago and has been a subject extensively studied in both Drosophila and mammals in the last...
A coordinated phosphorylation by Lats and CK1 regulates YAP stability through SCF<sup>β-TRCP</sup>
Bin Zhao, Li Li, Karen Tumaneng et al. · 2010 · Genes & Development · 1.4K citations
The Yes-associated protein (YAP) transcription coactivator is a key regulator of organ size and a candidate human oncogene. YAP is inhibited by the Hippo pathway kinase cascade, at least in part vi...
The Hippo pathway: regulators and regulations
Fa‐Xing Yu, Kun‐Liang Guan · 2013 · Genes & Development · 1.2K citations
Control of cell number is crucial in animal development and tissue homeostasis, and its dysregulation may result in tumor formation or organ degeneration. The Hippo pathway in both Drosophila and m...
The Hippo–YAP pathway in organ size control and tumorigenesis: an updated version
Bin Zhao, Li Li, Qun‐Ying Lei et al. · 2010 · Genes & Development · 1.1K citations
The Hippo signaling pathway is gaining recognition as an important player in both organ size control and tumorigenesis, which are physiological and pathological processes that share common cellular...
TAZ Promotes Cell Proliferation and Epithelial-Mesenchymal Transition and Is Inhibited by the Hippo Pathway
Qun‐Ying Lei, Heng Zhang, Bin Zhao et al. · 2008 · Molecular and Cellular Biology · 910 citations
TAZ is a WW domain containing a transcription coactivator that modulates mesenchymal differentiation and development of multiple organs. In this study, we show that TAZ is phosphorylated by the Lat...
Tumor Suppressor LATS1 Is a Negative Regulator of Oncogene YAP
Yawei Hao, Alex Chun, Kevin J. Cheung et al. · 2007 · Journal of Biological Chemistry · 803 citations
LATS (large tumor suppressor) or warts is a Ser/Thr kinase that belongs to the Ndr/LATS subfamily of AGC (protein kinase A/PKG/PKC) kinases. It is a tumor suppressor gene originally isolated from D...
Reading Guide
Foundational Papers
Start with Zhao et al. (2007; 3075 citations) for YAP phosphorylation discovery, then Zhao et al. (2010; 1406 citations) for LATS-CK1 mechanism, and Yu and Guan (2013; 1215 citations) for full regulator map.
Recent Advances
Meng et al. (2016; 1674 citations) synthesizes regulation mechanisms; Mo et al. (2014; 675 citations) covers stem cell contexts; Zhao et al. (2012; 774 citations) details anoikis links.
Core Methods
Kinase assays measure MST/LATS activity; mutagenesis tests phospho-sites (Ser127); scaffolds via co-IP; signaling quantified by luciferase-TEAD reporters (Zhao et al., 2007; Lei et al., 2008).
How PapersFlow Helps You Research Hippo Pathway Core Kinase Cascade
Discover & Search
Research Agent uses searchPapers('Hippo core kinase cascade MST1 LATS') to retrieve Zhao et al. (2007; 3075 citations), then citationGraph to map MST1/2→LATS1/2 connections across 1674-cited Meng et al. (2016), and findSimilarPapers for scaffold variants.
Analyze & Verify
Analysis Agent applies readPaperContent on Zhao et al. (2010) to extract Ser127 phosphorylation kinetics, verifyResponse with CoVe against Meng et al. (2016) for cascade consistency, and runPythonAnalysis for kinase cascade simulations using NumPy to plot phosphorylation rates; GRADE scores evidence as A1 for core claims.
Synthesize & Write
Synthesis Agent detects gaps in LATS-MOB1 feedback via contradiction flagging across papers, while Writing Agent uses latexEditText for cascade diagrams, latexSyncCitations to integrate 10+ refs, and latexCompile for publication-ready reviews with exportMermaid for kinase flowcharts.
Use Cases
"Model MST1/2 to LATS1/2 phosphorylation rates from Hippo cascade papers"
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas simulation of kinase kinetics from Zhao et al. 2007 data) → matplotlib plots of cascade dynamics.
"Write review on YAP Ser127 phosphorylation in core Hippo cascade"
Synthesis Agent → gap detection → Writing Agent → latexEditText (draft section) → latexSyncCitations (add Zhao 2010, Meng 2016) → latexCompile → PDF with scaffold diagram.
"Find GitHub code for Hippo kinase cascade simulations"
Research Agent → searchPapers('Hippo LATS simulation') → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → exportCsv of models linked to Lei et al. 2008.
Automated Workflows
Deep Research workflow scans 50+ Hippo papers via searchPapers → citationGraph → structured report on MST-LATS phosphorylation hierarchies (Zhao et al., 2007 as anchor). DeepScan applies 7-step CoVe checkpoints to verify SAV1-MOB1 scaffold claims against Meng et al. (2016). Theorizer generates hypotheses on feedback loops from LATS/YAP data across 10 papers.
Frequently Asked Questions
What defines the Hippo core kinase cascade?
MST1/2-SAV1 phosphorylates and activates LATS1/2-MOB1, which then phosphorylates YAP/TAZ at Ser127 to retain them cytoplasmically (Zhao et al., 2007).
What are key methods for studying cascade dynamics?
Phospho-specific antibodies detect Ser127 changes; co-IP assays confirm SAV1-MOB1 scaffolds; live-cell FRET tracks kinase-substrate interactions (Zhao et al., 2010; Meng et al., 2016).
What are landmark papers on this cascade?
Zhao et al. (2007; 3075 citations) established YAP inactivation; Zhao et al. (2010; 1406 citations) detailed LATS-CK1 on YAP stability; Meng et al. (2016; 1674 citations) reviewed regulators.
What open problems persist?
Isoform-specific roles of MST1 vs. MST2; quantitative feedback strengths; tissue-specific scaffold variations lack models (Yu and Guan, 2013).
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