Primary Citation of Related Structures: 1R5C, 1R5D
PubMed Abstract:
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.
Related Citations:
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
Organizational Affiliation:
Dipartimento di Chimica, Università degli Studi di Napoli Federico II, Via Cynthia, 80126 Napoli, Italy.
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