X-ray structure of a pokeweed antiviral protein, coded by a new genomic clone, at 0.23 nm resolution. A model structure provides a suitable electrostatic field for substrate binding.Ago, H., Kataoka, J., Tsuge, H., Habuka, N., Inagaki, E., Noma, M., Miyano, M.
(1994) Eur.J.Biochem. 225: 369-374
- PubMed: 7925458
- PubMed Abstract:
- Isolation and Analysis of a Genomic Clone Encoding a Pokeweed Antiviral Protein
Kataoka, J.,Habuka, N.,Masuta, C.,Miyano, M.,Koiwai, A.
(1992) Plant Mol.Biol. 20: 879
- Expression of a Pokeweed Antiviral Protein in Escherichia Coli and its Characterization
Kataoka, J.,Ago, H.,Habuka, N.,Furuno, M.,Masuta, C.,Miyano, M.,Koiwai, A.
(1993) FEBS Lett. 320: 31
We have determined the crystal structure of alpha-pokeweed antiviral protein, a member of ribosome-inactivating proteins, at 0.23 nm resolution, by the molecular-replacement method. The crystals belong to the space group P2(1)2(1)2 with unit-cell dim ...
We have determined the crystal structure of alpha-pokeweed antiviral protein, a member of ribosome-inactivating proteins, at 0.23 nm resolution, by the molecular-replacement method. The crystals belong to the space group P2(1)2(1)2 with unit-cell dimensions a = 4.71, b = 11.63 and c = 4.96 nm, and contain one protein molecule/asymmetric unit based on a crystal volume/unit protein molecular mass of 2.1 x 10(-3) nm3/Da. The crystallographic residual value was reduced to 17.2% (0.6-0.23 nm resolution) with root-mean-square deviations in bond lengths of 1.9 pm and bond angles of 2.2 degrees. The C alpha-C alpha distance map shows that alpha-pokeweed antiviral protein is composed of three modules, the N-terminal (Ala1-Leu76), the central (Tyr77-Lys185) and the C-terminal (Tyr186-Thr266) modules. The substrate-binding site is formed as a cleft between the central and C-terminal modules and all the active residues exist on the central module. The electrostatic potential around the substrate-binding site shows that the central and C-terminal module sides of this cleft have a negatively and a positively charged region, respectively. This charge distribution in the protein seems to provide a suitable interaction with the substrate rRNA.
Life Science Research Laboratory, Japan Tobacco, Inc., Kanagawa.