The DNA-binding domain of human papillomavirus type 18 E1. Crystal structure, dimerization, and DNA binding - PubMed (original) (raw)
. 2004 Jan 30;279(5):3733-42.
doi: 10.1074/jbc.M311681200. Epub 2003 Oct 30.
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- PMID: 14593106
- DOI: 10.1074/jbc.M311681200
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The DNA-binding domain of human papillomavirus type 18 E1. Crystal structure, dimerization, and DNA binding
Anitra S Auster et al. J Biol Chem. 2004.
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Abstract
High risk types of human papillomavirus, such as type 18 (HPV-18), cause cervical carcinoma, one of the most frequent causes of cancer death in women worldwide. DNA replication is one of the central processes in viral maintenance, and the machinery involved is an excellent target for the design of antiviral therapy. The papillomaviral DNA replication initiation protein E1 has origin recognition and ATP-dependent DNA melting and helicase activities, and it consists of a DNA-binding domain and an ATPase/helicase domain. While monomeric in solution, E1 binds DNA as a dimer. Dimerization occurs via an interaction of hydrophobic residues on a single alpha-helix of each monomer. Here we present the crystal structure of the monomeric HPV-18 E1 DNA-binding domain refined to 1.8-A resolution. The structure reveals that the dimerization helix is significantly different from that of bovine papillomavirus type 1 (BPV-1). However, we demonstrate that the analogous residues required for E1 dimerization in BPV-1 and the low risk HPV-11 are also required for HPV-18 E1. We also present evidence that the HPV-18 E1 DNA-binding domain does not share the same nucleotide and amino acid requirements for specific DNA recognition as BPV-1 and HPV-11 E1.
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