Hcv ns3 protein fragments having helicase activity and...

C - Chemistry – Metallurgy – 12 – N

Patent

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C12N 15/52 (2006.01) C07K 14/18 (2006.01) C12N 9/00 (2006.01) C12N 9/90 (2006.01) C12N 9/96 (2006.01) C12N 15/62 (2006.01) C12Q 1/25 (2006.01) C12Q 1/70 (2006.01)

Patent

CA 2226293

The Hepatitis C Virus (HCV) NS3 protein contains amino acid motifs of a serine proteinase, a nucleotide triphosphatase (NTPase), and an RNA helicase. A carboxy fragment of the HCV NS3 protein was purified and possessed RNA helicase activity. Defections from the amino terminus resulted in the protein becoming soluble. Deletions from the carboxy terminus do not result in a loss of helicase activity until at least 50 amino acids are deleted, the helicase activity requires ATP and divalent cations such as Mg2+ and Mn2+. The helicase activity was blocked by monoclonal antibody specific to the HCV NS3 protein.

La protéine NS3 du virus de l'Hépatite C contient des motifs d'acides aminés d'une sérine protéinase, d'une triphosphatase (NTPase) nucléotidique et d'une ARN-hélicase d'ARN. Les détections faites à partir de l'extrémité amino ont entraîné la solubilité de la protéine. Les délétions faites à partir de l'extrémité carboxy n'occasionnent pas de perte d'activité de l'hélicase jusqu'à ce qu'au moins 50 acides aminés aient subi une délétion. L'activité de l'hélicase nécessite l'ATP et des cations divalents tels que Mg<2+> et Mn<2+>. L'activité de l'hélicase a été bloquée par un anticorps monoclonal spécifique à la protéine NS3 du virus de l'hépatite C.

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