Publication Date:
2007-08-04
Description:
To identify cytoskeletal proteins that change conformation or assembly within stressed cells, in situ labeling of sterically shielded cysteines with fluorophores was analyzed by fluorescence imaging, quantitative mass spectrometry, and sequential two-dye labeling. Within red blood cells, shotgun labeling showed that shielded cysteines in the two isoforms of the cytoskeletal protein spectrin were increasingly labeled as a function of shear stress and time, indicative of forced unfolding of specific domains. Within mesenchymal stem cells-as a prototypical adherent cell-nonmuscle myosin IIA and vimentin are just two of the cytoskeletal proteins identified that show differential labeling in tensed versus drug-relaxed cells. Cysteine labeling of proteins within live cells can thus be used to fluorescently map out sites of molecular-scale deformation, and the results also suggest means to colocalize signaling events such as phosphorylation with forced unfolding.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2741095/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2741095/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Johnson, Colin P -- Tang, Hsin-Yao -- Carag, Christine -- Speicher, David W -- Discher, Dennis E -- R01 EB007049/EB/NIBIB NIH HHS/ -- R01 EB007049-01/EB/NIBIB NIH HHS/ -- R01 EB007049-02/EB/NIBIB NIH HHS/ -- R01 EB007049-03/EB/NIBIB NIH HHS/ -- R01 HL062352/HL/NHLBI NIH HHS/ -- R01 HL062352-09A1/HL/NHLBI NIH HHS/ -- R21 AR056128/AR/NIAMS NIH HHS/ -- R21 AR056128-01A1/AR/NIAMS NIH HHS/ -- R21 AR056128-02/AR/NIAMS NIH HHS/ -- S10 RR022575/RR/NCRR NIH HHS/ -- S10 RR022575-01A1/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2007 Aug 3;317(5838):663-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biophysical Engineering Lab, University of Pennsylvania, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17673662" target="_blank"〉PubMed〈/a〉
Keywords:
Chromatography, Liquid
;
Cysteine/chemistry
;
Cytoskeletal Proteins/*chemistry
;
Erythrocytes/*chemistry
;
Fluorescence
;
Fluorescent Antibody Technique
;
Fluorescent Dyes
;
Heterocyclic Compounds with 4 or More Rings/pharmacology
;
Humans
;
Mesenchymal Stromal Cells/*chemistry
;
Naphthalenesulfonates
;
Nonmuscle Myosin Type IIA/chemistry
;
*Protein Conformation
;
*Protein Folding
;
Protein Structure, Quaternary
;
Protein Structure, Tertiary
;
Spectrin/chemistry
;
Stress, Mechanical
;
Tandem Mass Spectrometry
;
Temperature
;
Vimentin/chemistry
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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