Article (Scientific journals)
Identification of a denitrase activity against calmodulin in activated macrophages using high-field liquid chromatography--FTICR mass spectrometry.
Smallwood, Heather S; Lourette, Natacha; Boschek, Curt B et al.
2007In Biochemistry, 46 (37), p. 10498 - 10505
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Keywords :
Calmodulin; Protein Isoforms; 3-nitrotyrosine; Tyrosine; Lysine; Animals; Calmodulin/metabolism; Chickens; Chromatography, Liquid/methods; Lysine/metabolism; Macrophages/enzymology; Mass Spectrometry/methods; Mice; Oxidation-Reduction; Protein Isoforms/metabolism; Tyrosine/analogs & derivatives; Tyrosine/chemistry; Macrophage Activation; Activated macrophages; Aminotyrosine; Denitrase activity; Biochemistry
Abstract :
[en] We have identified a denitrase activity in macrophages that is upregulated following macrophage activation, which is shown by mass spectrometry to recognize nitrotyrosines in the calcium signaling protein calmodulin (CaM). The denitrase activity converts nitrotyrosines to their native tyrosine structure without the formation of any aminotyrosine. Comparable extents of methionine sulfoxide reduction are also observed that are catalyzed by endogenous methionine sulfoxide reductases. Competing with repair processes, oxidized CaM is a substrate for a peptidase activity that results in the selective cleavage of the C-terminal lysine (i.e., Lys148) that is expected to diminish CaM function. Thus, competing repair and peptidase activities define the abundances and functionality of CaM in modulating cellular metabolism in response to oxidative stress, where the presence of the truncated CaM species provides a useful biomarker for the transient appearance of oxidized CaM.
Disciplines :
Chemistry
Author, co-author :
Smallwood, Heather S ;  Biological Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA
Lourette, Natacha  ;  Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, United States
Boschek, Curt B;  Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, United States
Bigelow, Diana J;  Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, United States
Smith, Richard D;  Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, United States
Pasa-Tolić, Ljiljana;  Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, United States
Squier, Thomas C;  Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, United States ; Pacific Northwest National Laboratory, Mail Stop P7-53, Richland, WA 99352, United States
 These authors have contributed equally to this work.
Language :
English
Title :
Identification of a denitrase activity against calmodulin in activated macrophages using high-field liquid chromatography--FTICR mass spectrometry.
Publication date :
18 September 2007
Journal title :
Biochemistry
ISSN :
0006-2960
eISSN :
1520-4995
Publisher :
American Chemical Society (ACS), United States
Volume :
46
Issue :
37
Pages :
10498 - 10505
Peer reviewed :
Peer Reviewed verified by ORBi
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