Cleavage of nicotinamide adenine dinucleotide by the ribosome-inactivating protein from Momordica charantia

The interaction of momordin, a type 1 ribosome‐inactivating protein from Momordica charantia, with NADP+ and NADPH has been investigated by X‐ray diffraction analysis of complexes generated by co‐crystallization and crystal soaking. It is known that the proteins of this family readily cleave the ade...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Acta crystallographica. Section F, Structural biology communications Structural biology communications, 2015-09, Vol.71 (9), p.1152-1155
Hauptverfasser: Vinkovic, M., Dunn, G., Wood, G. E., Husain, J., Wood, S. P., Gill, R.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The interaction of momordin, a type 1 ribosome‐inactivating protein from Momordica charantia, with NADP+ and NADPH has been investigated by X‐ray diffraction analysis of complexes generated by co‐crystallization and crystal soaking. It is known that the proteins of this family readily cleave the adenine–ribose bond of adenosine and related nucleotides in the crystal, leaving the product, adenine, bound to the enzyme active site. Surprisingly, the nicotinamide–ribose bond of oxidized NADP+ is cleaved, leaving nicotinamide bound in the active site in the same position but in a slightly different orientation to that of the five‐membered ring of adenine. No binding or cleavage of NADPH was observed at pH 7.4 in these experiments. These observations are in accord with current views of the enzyme mechanism and may contribute to ongoing searches for effective inhibitors.
ISSN:2053-230X
2053-230X
DOI:10.1107/S2053230X15013540