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Nucleotide sequence of the Rasheed rat sarcoma virus oncogene: new mutations
Abstract:
The nucleotide sequence of the oncogene of the Rasheed strain of rat sarcoma virus was determined. The oncogene (Ra-v-ras) encodes a 29,000-dalton (p29) transforming protein. This protein is distinct from the immunologically related 21,000-dalton protein (p21) of the Harvey murine sarcoma virus in its amino terminus and in having additional mutations in its carboxyl terminus. Although the functional significance of these changes is unknown, they appear to occur only in rat sarcoma virus.
Insights
Researchers sequenced the rat sarcoma virus oncogene (Ra-v-ras), revealing a distinct 29,000-dalton transforming protein (p29). This protein differs from Harvey murine sarcoma virus p21, with unique amino and carboxyl terminus mutations specific to rat sarcoma virus.
Area of Science:
- Molecular Biology
- Virology
- Oncology
Background:
- The Rasheed strain of rat sarcoma virus contains an oncogene responsible for cellular transformation.
- Understanding oncogene sequences is crucial for identifying viral oncogenes and their protein products.
Purpose of the Study:
- To determine the nucleotide sequence of the rat sarcoma virus oncogene (Ra-v-ras).
- To characterize the transforming protein encoded by Ra-v-ras and compare it to related viral proteins.
Main Methods:
- Nucleotide sequencing of the Ra-v-ras oncogene.
- Analysis of the encoded protein sequence and comparison with Harvey murine sarcoma virus p21.
Main Results:
- The Ra-v-ras oncogene encodes a 29,000-dalton transforming protein (p29).
- The p29 protein exhibits distinct amino-terminal sequences and additional carboxyl-terminal mutations compared to Harvey murine sarcoma virus p21.
- These sequence variations appear to be unique to the rat sarcoma virus.
Conclusions:
- The nucleotide sequence analysis reveals a novel transforming protein (p29) in the Rasheed rat sarcoma virus.
- The identified sequence differences suggest potential functional or regulatory distinctions between rat sarcoma virus and Harvey murine sarcoma virus.
- Further investigation is needed to elucidate the functional significance of these observed mutations in p29.