Bovine pancreatic RNase A (ribonuclease A) aggregates to form various types of catalytically active oligomers during lyophilization from aqueous acetic acid solutions. Each oligomeric species is present in at least two conformational isomers. The structures of two dimers and one of the two trimers have been solved, while plausible models have been proposed for the structures of a second trimer and two tetrameric conformers. In this review, these structures, as well as the general conditions for RNase A oligomerization, based on the well known 3D (three-dimensional) domain-swapping mechanism, are described and discussed. Attention is also focused on some functional properties of the RNase A oligomers. Their enzymic activities, particularly their ability to degrade double-stranded RNAs and polyadenylate, are summarized and discussed. The same is true for the remarkable antitumour activity of the oligomers, displayed in vitro and in vivo, in contrast with monomeric RNase A, which lacks these activities. The RNase A multimers also show an aspermatogenic action, but lack any detectable embryotoxicity. The fact that both activity against double-stranded RNA and the antitumour action increase with the size of the oligomer suggests that these activities may share a common structural requirement, such as a high number or density of positive charges present on the RNase A oligomers.
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Review Article|
June 01 2004
Oligomerization of bovine ribonuclease A: structural and functional features of its multimers
Massimo LIBONATI;
Massimo LIBONATI
1
Dipartimento di Scienze Neurologiche e della Visione, Sezione di Chimica Biologica, Facoltà di Medicina e Chirurgia dell'Università di Verona, Strada Le Grazie 8, I-37134 Verona, Italy
1To whom correspondence should be addressed (e-mail [email protected]).
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Giovanni GOTTE
Giovanni GOTTE
Dipartimento di Scienze Neurologiche e della Visione, Sezione di Chimica Biologica, Facoltà di Medicina e Chirurgia dell'Università di Verona, Strada Le Grazie 8, I-37134 Verona, Italy
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Publisher: Portland Press Ltd
Received:
December 12 2003
Revision Received:
February 24 2004
Accepted:
April 22 2004
Accepted Manuscript online:
April 22 2004
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London ©2004
2004
Biochem J (2004) 380 (2): 311–327.
Article history
Received:
December 12 2003
Revision Received:
February 24 2004
Accepted:
April 22 2004
Accepted Manuscript online:
April 22 2004
Citation
Massimo LIBONATI, Giovanni GOTTE; Oligomerization of bovine ribonuclease A: structural and functional features of its multimers. Biochem J 1 June 2004; 380 (2): 311–327. doi: https://doi.org/10.1042/bj20031922
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