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KRAS K104 modification affects the KRASG12D-GEF interaction and mediates cell growth and motility.


ABSTRACT: Mutant RAS genes play an important role in regulating tumors through lysine residue 104 to impair GEF-induced nucleotide exchange, but the regulatory role of KRAS K104 modification on the KRASG12D mutant remains unclear. Therefore, we simulated the acetylation site on the KRASG12D three-dimensional protein structure, including KRASG12D, KRASG12D/K104A and KRASG12D/K104Q, and determined their trajectories and binding free energy with GEF. KRASG12D/K104Q induced structural changes in the ?2- and ?3-helices, promoted KRAS instability and hampered GEF binding (??G?=?6.14 kJ/mol). We found decreased binding to the Raf1 RBD by KRASG12D/K104Q and reduced cell growth, invasion and migration. Based on whole-genome cDNA microarray analysis, KRASG12D/K104Q decreased expression of NPIPA2, DUSP1 and IL6 in lung and ovarian cancer cells. This study reports computational and experimental analyses of Lys104 of KRASG12D and GEF, and the findings provide a target for exploration for future treatment.

SUBMITTER: Chen CC 

PROVIDER: S-EPMC7567070 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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KRAS K104 modification affects the KRAS<sup>G12D</sup>-GEF interaction and mediates cell growth and motility.

Chen Chih-Chieh CC   Hsu Chia-Yi CY   Lin Hsiao-Yun HY   Zeng Hong-Qi HQ   Cheng Kuang-Hung KH   Wu Chia-Wei CW   Tsai Eing-Mei EM   Hsieh Tsung-Hua TH  

Scientific reports 20201015 1


Mutant RAS genes play an important role in regulating tumors through lysine residue 104 to impair GEF-induced nucleotide exchange, but the regulatory role of KRAS K104 modification on the KRAS<sup>G12D</sup> mutant remains unclear. Therefore, we simulated the acetylation site on the KRAS<sup>G12D</sup> three-dimensional protein structure, including KRAS<sup>G12D</sup>, KRAS<sup>G12D/K104A</sup> and KRAS<sup>G12D/K104Q</sup>, and determined their trajectories and binding free energy with GEF. KRA  ...[more]

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