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J Gen Virol 78 (1997), 911-915
© 1997 Society for General Microbiology
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Journal of General Virology, Vol 78, 911-915, Copyright © 1997 by Society for General Microbiology

ARTICLES

Characterization of the DNA-binding activity of the E1 and E2 proteins and the E1/E2 complex of human papillomavirus type 33

F Muller, T Giroglou and M Sapp
Institut fur, Medizinische Mikrobiologie und Hygiene, Hochhaus am Augustusplatz, Universitat Mainz, Germany.

The E1 and E2 proteins of papillomaviruses are essential for the initiation of viral DNA replication. We have purified the E2 protein of human papillomavirus type 33 (HPV-33) by immunoaffinity chromatography. The purified E2 protein bound with high affinity to all four consensus binding sites of HPV-33 (Kd approximately equal to 2 x 10(-10)M). A putative E2 binding site differing at one position in the second stem of the palindrome was not bound by E2. The E1 protein of HPV-33 purified by affinity chromatography using glutathione S-transferase as tag displayed specific DNA-binding activity in footprint analyses protecting HPV-33 nucleotides 7896 to 7909/1 to 18 from DNasel digestion. Hypersensitive sites at position 6 on the sense and position 1 on the antisense strand were observed in the middle of the protected region. An E1/E2 complex protected the E1 binding site and E2 binding sites from DNasel digestion suggesting that both proteins retain DNA- binding activity in the complex.


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