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Updated: Mar 30, 2026

Mapping the Structure-Function Relationships of Disordered Oncogenic Transcription Factors Using Transcriptomic Analysis
Published on: June 27, 2020
Structure-function analysis of fos protein: a single amino acid change activates the immortalizing potential of v-fos
Abstract:
We have undertaken a detailed structure-function analysis of v-fos protein, taking the ability to induce transformation and immortalization as criteria of biological activity. Our results demonstrate that the evolutionarily conserved center region of fos, comprising ca. 28% of the protein, is indispensable for its function. A single amino acid change (Glu 138----Val 138) in this region activates the immortalizing potential of v-fos without affecting its transforming capacity. The presence of additional either N- or C-terminal amino acids, however, is required for efficient expression of a stable protein, and significantly increases its biological activity. In contrast, sequences in the C-terminal half (between positions 228 and 267) strongly downmodulate the transforming activity of v-fos protein without decreasing its immortalizing potential.
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