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:  1R5D
- Also Cited By: 1TQ9, 3BCM, 3BCO, 3BCP
- 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.,Sect.D 49: 389
- 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
- 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
- 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
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 ...
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.