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Characterize Disease-related Mutants of RAF Family Kinases by Using a Set of Practical and Feasible Methods
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CRISPR-Cas9 mediated RALA knockout and reconstitution: insights into the detection and role of RALA S194

Mayuresh Vishwas Konde1, Siddhi Inchanalkar1, Tushar Manik Sherkhane1

  • 1IISER Pune: Indian Institute of Science Education Research Pune, India.

Biology Open
|June 26, 2025
PubMed

Insights

RAS-driven cancer relies on RALA, but its Serine194 phosphorylation is not essential for activation. This phosphorylation is crucial for tumor formation, potentially by influencing RALA localization.

Area of Science:

  • Molecular Oncology
  • Cancer Biology
  • Signal Transduction

Background:

  • RAS oncogenes drive cancer by activating downstream effectors like RALA.
  • RALA's role in tumorigenesis is potentially regulated by phosphorylation at Serine194.
  • Understanding RALA phosphorylation is critical for targeting RAS-dependent cancers.

Purpose of the Study:

  • To investigate the role of RALA Serine194 phosphorylation in cancer.
  • To determine if RALA S194 phosphorylation affects RALA activation or tumor formation.
  • To assess the specificity of anti-phospho-RALA antibodies in cancer models.

Main Methods:

  • CRISPR-Cas9 RALA knockout (RALA KO) in RAS-dependent and independent cancer cells.
  • Reconstitution of RALA KO cells with wild-type (WT) RALA and S194A-RALA mutants.
  • Assessment of RALA activation, pS194RALA detection, and tumor growth restoration.

Main Results:

  • Commercial anti-phospho-RALA antibody lacked specificity in RAS-dependent cancers.
  • RALA S194 phosphorylation did not affect RALA activation in reconstituted cells.
  • WT-RALA restored tumor growth in RALA KO cells, but the S194A-RALA mutant did not.

Conclusions:

  • RALA Serine194 phosphorylation is essential for tumor formation, not RALA activation.
  • The S194 residue's role in tumor growth may be linked to RALA localization.
  • This finding offers new insights into RALA's function in oncogenesis.
Keywords:
CRISPR-Cas9RALARAS-dependentRAS-independentVMLNpS194RALA

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