Using the SpyTag SpyCatcher system to label smooth muscle myosin II filaments with a quantum dot on the regulatory light chain.
Cytoskeleton (Hoboken)
; 76(2): 192-199, 2019 02.
Article
in En
| MEDLINE
| ID: mdl-30861328
ABSTRACT
The regulatory light chain (RLC) of myosin is commonly tagged to monitor myosin behavior in vitro, in muscle fibers, and in cells. The goal of this study was to prepare smooth muscle myosin (SMM) filaments containing a single head labeled with a quantum dot (QD) on the RLC. We show that when the RLC is coupled to a QD at Cys-108 and exchanged into SMM, subsequent filament assembly is severely disrupted. To address this, we used a novel approach for myosin by implementing the SpyTag002 SpyCatcher002 system to prepare SMM incorporated with RLC constructs fused to SpyTag or SpyCatcher. We show that filament assembly, actin-activated steady-state ATPase activities, ability to be phosphorylated, and selected enzymatic and mechanical properties were essentially unaffected if either SpyTag or SpyCatcher were fused to the C-terminus of the RLC. Crucially for our application, we also show that a QD coupled to SpyCatcher can be covalently attached to a RLC-Spy incorporated into a SMM filament without disrupting the filament, and that the filaments can move along actin in vitro.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Staining and Labeling
/
Myosin Light Chains
/
Myosin Type II
/
Smooth Muscle Myosins
/
Quantum Dots
Limits:
Animals
Language:
En
Journal:
Cytoskeleton (Hoboken)
Year:
2019
Document type:
Article