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Protein & Peptide Letters

Editor-in-Chief

ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

The Role Of Tyrosine Residues In The Rna N-Glycosidase Activity Of Cinnamomin A-Chain

Author(s): Hong Xu and Wang-Yi Liu

Volume 10, Issue 5, 2003

Page: [503 - 509] Pages: 7

DOI: 10.2174/0929866033478771

Price: $65

Abstract

Cinnamomin is a type II ribosome-inactivating protein (RIP) and its A-chain (CTA) is a RNA Nglycosidase. It is observed that modification of tyrosine residues by N-acetylimidazole (N-AI) causes almost complete loss of CTA activity. Adenine partially protects tyrosine residues from modification by NAI. It is proposed that tyrosine residues are involved in the active site of CTA and they are crucial in recognition and binding of ribosomal RNA. Tryptophan residues of CTA are also studied by NBS modification.

Keywords: chemical modification, cinnamomin, ribosome-inactivating protein, rna n-glycosidase, tryptophan residue, tyrosine residue


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