期刊
JOURNAL OF VIROLOGY
卷 77, 期 5, 页码 3334-3338出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/JVI.77.5.3334-3338.2003
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Ebola virus VP30 is an essential activator of viral transcription. In viral particles, VP30 is closely associated with the nucleocapsid complex. A conspicuous structural feature of VP30 is an unconventional zinc-binding CYS3-His motif comprising amino acids 68 to 95. By using a colorimetric zinc-binding assay we found that the V 30-specific CYS3-His motif stoichiometrically binds zinc ions in a one-to-one relationship. Substitution of the conserved cysteines and the histidine within the motif led to a complete loss of the capacity for zinc binding. Functional analyses revealed that none of the tested mutations of the proposed zinc-coordinating residues influenced binding of NT30 to nucleocapsid-like particles but, concerning its role in activating viral transcription, all resulted in a protein that was inactive.
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