2di2

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NMR structure of the HIV-2 nucleocapsid protein

Overview

NCp8 of HIV-2 contains two CCHC-type zinc fingers connected by a linker, and is involved in many critical steps of the virus life cycle. It was, previously shown that the first zinc finger flanked by the linker is the, minimal active domain for specific binding to viral RNA. In our previous, study, we determined the three-dimensional structure of NCp8-f1, including, the minimal active domain, and found that a hydrogen bond between Asn(11), N(delta)H and Arg(27) O stabilized the conformation of the linker in the, vicinity of the zinc finger [Kodera et al. (1998) Biochemistry 37, 17704-17713]. In this study, RNA binding activities of NCp8-f1 and three, types of its mutant peptides were analysed by native PAGE assay. The, activity and three-dimensional structure of NCp8-f1/N11A, in which alanine, is substituted for Asn(11) thereby affecting the conformation of the, linker, was analyzed and compared with those of NCp8-f1. We demonstrated, that the existence of Arg(4) and/or Lys(5) and Arg(26) and/or Arg(27) were, necessary for binding RNA. Furthermore, the linker's flexible orientation, which is controlled by the hydrogen bond between Asn(11) N(delta)H and, Arg(27) O, appears to be a structural basis for NCp8 existing as a, multi-functional protein.

About this Structure

2DI2 is a Single protein structure of sequence from [1] with ZN as ligand. Full crystallographic information is available from OCA.

Reference

RNA Recognition Mechanism of the Minimal Active Domain of the Human Immunodeficiency Virus Type-2 Nucleocapsid Protein., Matsui T, Kodera Y, Endoh H, Miyauchi E, Komatsu H, Sato K, Tanaka T, Kohno T, Maeda T, J Biochem (Tokyo). 2007 Feb;141(2):269-277. Epub 2007 Jan 3. PMID:17202191

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