Related Experiment Video

Updated: Jan 1, 2026

Fully Processed Recombinant KRAS4b: Isolating and Characterizing the Farnesylated and Methylated Protein
07:08

Fully Processed Recombinant KRAS4b: Isolating and Characterizing the Farnesylated and Methylated Protein

Published on: January 16, 2020

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Galectin-8 binds to the Farnesylated C-terminus of K-Ras4B and Modifies Ras/ERK Signaling and Migration in Pancreatic

Christopher Meinohl1, Sarah J Barnard1, Karin Fritz-Wolf2,3

  • 1Signal Transduction of Cellular Motility, Internal Medicine V, Justus Liebig University Giessen, D-35392 Giessen, Germany.

Cancers
|December 22, 2019
PubMed

Insights

Researchers discovered Galectin-8 binds directly to K-Ras4B, a key cancer driver. This interaction, involving K-Ras4B

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • K-Ras is a critical oncogene driving tumor formation, yet effective inhibitors remain elusive.
  • Targeting K-Ras interactions offers novel therapeutic strategies against cancer.

Purpose of the Study:

  • To identify novel K-Ras4B binding proteins and characterize their interaction domains.
  • To explore the functional consequences of the K-Ras4B-Galectin-8 interaction in cancer cells.

Main Methods:

  • Mass spectrometry and protein interaction studies to identify K-Ras4B binding partners.
  • siRNA-mediated gene silencing to assess the functional role of Galectin-8.
  • Binding assays and structural modeling to delineate the interaction interface.

Main Results:

  • Galectin-8 was identified as a novel, direct binding protein for K-Ras4B.
  • Galectin-8 depletion increased K-Ras4B levels and ERK1/2 activity, enhancing cell migration and proliferation.
  • The interaction involves Galectin-8's N-terminal carbohydrate recognition domain (N-CRD) binding to the farnesylated polybasic domain (PBD) of K-Ras4B.

Conclusions:

  • Galectin-8 is a novel K-Ras4B binding partner, modulating K-Ras effector pathways.
  • The interaction between Galectin-8's N-CRD and farnesylated K-Ras4B PBD impacts cancer cell behavior.
  • This discovery opens new avenues for targeting oncogenic K-Ras in lung and pancreatic cancers.
Keywords:
ERKGalectin-8K-Ras4Blung and pancreatic carcinomamigrationproliferationsignal transduction

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