Population shift vs induced fit: The case of bovine seminal ribonuclease swapping dimerMerlino, A., Vitagliano, L., Sica, F., Zagari, A., Mazzarella, L.
(2004) Biopolymers 73: 689-695
- PubMed: 15048772
- DOI: 10.1002/bip.20016
- Primary Citation of Related Structures:
- PubMed Abstract:
- BOVINE SEMINAL RIBONUCLEASE: STRUCTURE AT 1.9 A RESOLUTION
Mazzarella, L., Capasso, S., Demasi, D., Di Lorenzo, G., Mattia, C.A., Zagari, A.
(1993) Acta Crystallogr D Biol Crystallogr 49: 389
- Binding of a Substrate Analog to a Domain Swapping Protein: X-Ray Structure of the Complex of Bovine Seminal Ribonuclease with Uridylyl(2'-5')Adenosine
Vitagliano, L., Adinolfi, S., Riccio, A., Sica, F., Zagari, A., Mazzarella, L.
(1998) Protein Sci 7: 1691
- Cosolute Effect on Crystallization of Two Dinucleotide Complexes of Bovine Seminal Ribonuclease from Concentrated Salt Solutions
Sica, F., Adinolfi, S., Vitagliano, L., Zagari, A., Capasso, S., Mazzarella, L.
(1996) J Cryst Growth 168: 192
- A potential allosteric subsite generated by domain swapping in bovine seminal ribonuclease
VITAGLIANO, L., Adinolfi, S., Sica, F., Merlino, A., Zagari, A., Mazzarella, L.
(1999) J Mol Biol 293: 569
- Crystallization of Multiple Forms of Bovine Seminal Ribonuclease: the liganded and Unliganded State
(1999) J Cryst Growth 196: 305
Bovine seminal ribonuclease (BS-RNase) is a unique member of the pancreatic-like ribonuclease superfamily. This enzyme exists as two conformational isomers with distinctive biological properties. The structure of the major isomer is characterized by the swapping of the N-terminal segment (MxM BS-RNase) ...
Bovine seminal ribonuclease (BS-RNase) is a unique member of the pancreatic-like ribonuclease superfamily. This enzyme exists as two conformational isomers with distinctive biological properties. The structure of the major isomer is characterized by the swapping of the N-terminal segment (MxM BS-RNase). In this article, the crystal structures of the ligand-free MxM BS-RNase and its complex with 2'-deoxycitidylyl(3',5')-2'-deoxyadenosine derived from isomorphous crystals have been refined. Interestingly, the comparison between this novel ligand-free form and the previously published sulfate-bound structure reveals significant differences. In particular, the ligand-free MxM BS-RNase is closer to the structure of MxM BS-RNase productive complexes than to the sulfate-bound form. These results reveal that MxM BS-RNase presents a remarkable flexibility, despite the structural constraints of the interchain disulfide bridges and the swapping of the N-terminal helices. These findings have important implications to the ligand binding mechanism of MxM BS-RNase. Indeed, a population shift rather than a substrate-induced conformational transition may occur in the MxM BS-RNase ligand binding process.
Dipartimento di Chimica, Università degli Studi di Napoli Federico II, Via Cynthia, 80126 Napoli, Italy.