Document Detail

Modification of SR-PSOX functions by multi-point mutations of basic amino acid residues.
MedLine Citation:
PMID:  23009930     Owner:  NLM     Status:  MEDLINE    
SR-PSOX can function as a scavenger receptor, a chemokine and an adhesion molecule, and it could be an interesting player in the formation of atherosclerotic lesions. Our previous studies demonstrated that basic amino acid residues in the chemokine domain of SR-PSOX are critical for its functions. In this study the combinations of the key basic amino acids in the chemokine domain of SR-PSOX have been identified. Five combinations of basic amino acid residues that may form conformational motif for SR-PSOX functions were selected for multi-point mutants. The double mutants of K61AR62A, R76AK79A, R82AH85A, and treble mutants of R76AR78AK79A, R78AR82AH85A were successfully constructed by replacing the combinations of two or three basic amino acid residues with alanine. After successful expression of these mutants on the cells, the functional studies showed that the cells expressing R76AK79A and R82AH85A mutants significantly increased the activity of oxLDL uptake compared with that of wild-type SR-PSOX. Meanwhile, the cells expressing R76AK79A mutant also dramatically enhanced the phagocytotic activity of SR-PSOX. However, the cells expressing the construct of combination of R78A mutation in R76AK79A or R82AH85A could abolish these effects. More interestingly, the adhesive activities were remarkably down regulated in the cells expressing the multi-point mutants respectively. This study revealed that some conformational motifs of basic amino acid residues, especially R76 with K79 in SR-PSOX, may form a common functional motif for its critical functions. R78 in SR-PSOX has the potential action to stabilize the function of oxLDL uptake and bacterial phagocytosis. The results obtained may provide new insight for the development of drug target of atherosclerosis.
Weiwei Liu; Lan Yin; Yalei Dai
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-23
Journal Detail:
Title:  Biochimie     Volume:  95     ISSN:  1638-6183     ISO Abbreviation:  Biochimie     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-01-28     Completed Date:  2013-06-28     Revised Date:  2013-08-23    
Medline Journal Info:
Nlm Unique ID:  1264604     Medline TA:  Biochimie     Country:  France    
Other Details:
Languages:  eng     Pagination:  224-30     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Masson SAS. All rights reserved.
Department of Immunology, Tongji University School of Medicine, Medical Research Building, RmF509, 1239 Siping Road, Shanghai 200092, China.
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MeSH Terms
Alanine / chemistry,  genetics
Arginine / chemistry*,  genetics
Cell Adhesion
Chemokines, CXC / chemistry*,  genetics,  metabolism
Escherichia coli
Gene Expression
HEK293 Cells
Lipoproteins, LDL / chemistry*,  metabolism
Lysine / chemistry*,  genetics
Point Mutation*
Receptors, Scavenger / chemistry*,  genetics,  metabolism
Structure-Activity Relationship
Reg. No./Substance:
0/CXCL16 protein, human; 0/Chemokines, CXC; 0/Lipoproteins, LDL; 0/Receptors, Scavenger; 0/oxidized low density lipoprotein; 56-41-7/Alanine; 56-87-1/Lysine; 74-79-3/Arginine

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