Study of the Expression Transition of Cardiac Myosin Using Polarization-Dependent SHG Microscopy.
Biophys J
; 118(5): 1058-1066, 2020 03 10.
Article
in En
| MEDLINE
| ID: mdl-31995740
ABSTRACT
Detection of the transition between the two myosin isoforms α- and ß-myosin in living cardiomyocytes is essential for understanding cardiac physiology and pathology. In this study, the differences in symmetry of polarization spectra obtained from α- and ß-myosin in various mammalian ventricles and propylthiouracil-treated rats are explored through polarization-dependent second harmonic generation microscopy. Here, we report for the, to our knowledge, first time that α- and ß-myosin, as protein crystals, possess different symmetries the former has C6 symmetry, and the latter has C3v. A single-sarcomere line scan further demonstrated that the differences in polarization-spectrum symmetry between α- and ß-myosin came from their head regions the head and neck domains of α- and ß-myosin account for the differences in symmetry. In addition, the dynamic transition of the polarization spectrum from C6 to C3v line profile was observed in a cell culture in which norepinephrine induced an α- to ß-myosin transition.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Sarcomeres
/
Cardiac Myosins
Limits:
Animals
Language:
En
Journal:
Biophys J
Year:
2020
Document type:
Article