Document Detail

O-GlcNAcylation of the Plum pox virus capsid protein catalyzed by SECRET AGENT: characterization of O-GlcNAc sites by electron transfer dissociation mass spectrometry.
MedLine Citation:
PMID:  20676902     Owner:  NLM     Status:  MEDLINE    
The capsid protein of Plum pox virus (PPV-CP) is modified with O-linked β-N-acetylglucosamine (O-GlcNAc). In Arabidopsis thaliana this modification is made by an O-GlcNAc transferase named SECRET AGENT (SEC). Modification of PPV-CP by SEC is hypothesized to have a direct role in the infection process, because virus titer and rate of spread are reduced in SEC mutants. Previous studies used deletion mapping and site-directed mutagenesis to identify four O-GlcNAc sites on the capsid protein that are modified by Escherichia coli-expressed SEC. The infection process was not affected when two of these sites were mutated suggesting that O-GlcNAcylation of these sites does not have a significant role in the infection process or that a subset of the modifications is sufficient. Since it is possible that the mutational mapping approach missed or incorrectly identified O-GlcNAc sites, the modifications produced by E. coli-expressed SEC were characterized using mass spectrometry. O-GlcNAcylated peptides were enzymatically tagged with galactose, the products were enriched on immobilized Ricinus communis agglutinin I and sequenced by electron transfer dissociation (ETD) mass spectrometry. Five O-GlcNAc sites on PPV-CP were identified. Two of these sites were not identified in by the previous mutational mapping. In addition, one site previously predicted by mutation mapping was not detected, but modification of this site was not supported when the mutation mapping was repeated. This study suggests that mapping modification sites by ETD mass spectrometry is more comprehensive and accurate than mutational mapping.
Young-Cheon Kim; Namrata D Udeshi; Jeremy L Balsbaugh; Jeffrey Shabanowitz; Donald F Hunt; Neil E Olszewski
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-07-31
Journal Detail:
Title:  Amino acids     Volume:  40     ISSN:  1438-2199     ISO Abbreviation:  Amino Acids     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-02-18     Completed Date:  2011-05-24     Revised Date:  2014-09-16    
Medline Journal Info:
Nlm Unique ID:  9200312     Medline TA:  Amino Acids     Country:  Austria    
Other Details:
Languages:  eng     Pagination:  869-76     Citation Subset:  IM    
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MeSH Terms
Acetylglucosamine / metabolism*
Amino Acid Sequence
Arabidopsis Proteins / genetics,  metabolism*
Capsid Proteins / chemistry*,  genetics,  metabolism*
Mass Spectrometry
Molecular Sequence Data
N-Acetylglucosaminyltransferases / genetics,  metabolism*
Peptide Mapping
Plum Pox Virus / chemistry,  genetics,  metabolism*
Grant Support
Reg. No./Substance:
0/Arabidopsis Proteins; 0/Capsid Proteins; EC 2.4.1.-/N-Acetylglucosaminyltransferases; EC 2.4.1.-/SECRET AGENT protein, Arabidopsis; V956696549/Acetylglucosamine

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