The 1.4A structure of dianthin 30 indicates a role of surface potential at the active site of type 1 ribosome inactivating proteinsFermani, S., Falini, G., Ripamonti, A., Polito, L., Stirpe, F., Bolognesi, A.
(2005) J Struct Biol 149: 204-212
- PubMed: 15681236
- DOI: 10.1016/j.jsb.2004.11.007
- Primary Citation of Related Structures:
- PubMed Abstract:
- Crystallization and preliminary X-ray diffraction analysis of two ribosomes-inactivating
proteins: lychnin and dianthin 30
Fermani, S., Falini, G., Ripamonti, A., Bolognesi, A., Polito, L., Stirpe, F.
(2003) Acta Crystallogr D Biol Crystallogr 59: 1227
- Ribosome-inactivating proteins from plants
Barbieri, L., Battelli, M.G., Stirpe, F.
(1993) Biochim Biophys Acta 1154: 237
- Dianthins, ribosome-damaging proteins with anti-viral properties from Dianthus caryophyllus L. (carnation)
Stirpe, F., Williams, D.G., Onyon, L.G., Legg, R.F., Stevens, W.A.
(1981) Biochem J 195: 399
Ribosome inactivating proteins (RIPs) are plant proteins with enzymatic activity identified as rRNA N-glycosidase (EC 22.214.171.124), which cleaves the N-glycosidic bond of a specific adenine on the ricin/sarcin region of rRNA, thus causing inhibition of prot ...
Ribosome inactivating proteins (RIPs) are plant proteins with enzymatic activity identified as rRNA N-glycosidase (EC 126.96.36.199), which cleaves the N-glycosidic bond of a specific adenine on the ricin/sarcin region of rRNA, thus causing inhibition of protein synthesis. They also depurinate extensively DNA and other polynucleotides. The three-dimensional structure of dianthin 30, a type 1 (single-chain) RIP of Dianthus caryophyllus (leaves), is now described at 1.4 angstroms, a resolution never achieved before for any RIP. The fold typical of RIPs is conserved, despite some differences in the loop regions. The general structure comparison by superimposed alpha-carbon (249 atoms) and the sequence alignment by structure for dianthin 30 and saporin-S6 give a root mean square deviation of 0.625 angstroms. Despite the differences reported for the biological activities of the two RIPs, their structures fit quite well and both show a protein segment containing strands beta7, beta8, and beta9 shorter than other RIPs. However, the surface electrostatic potential in the active site region neatly distinguishes dianthin 30 from saporin-S6. The possible relationship between the charge distribution and the behavior of the proteins toward different substrates is discussed.
Dipartimento di Chimica G. Ciamician, Alma Mater Studiorum Universita' di Bologna, via Selmi 2, I-40126 Bologna, Italy.