Fluorescent kabiramides: new probes to quantify actin in vitro and in vivo.
We present the design, synthesis, and biochemical and spectroscopic characterization of five functional fluorescent conjugates of kabiramide C (KabC), a small molecule biomimetic of gelsolin. The tetramethylrhodamine (TMR), rhodol green (RG), IC5, dapoxyl (DAP), and fluorescein diester (FDE) conjugates of KabC bind specifically to actin at the barbed end in a 1:1 complex. These probes are shown to function in an indistinguishable manner to the unmodified KabC. Various modalities of the fluorescence emission of these KabC probes, including fluorescence anisotropy and fluorescence resonance energy transfer, are used for the development of assays for the rapid determination of G-actin concentration in solution. The TMR-KabC and FDE-KabC probes are cell permeable and provide unique imaging information on the distribution and dynamics of actin filament within living cells.
Petchprayoon
Chutima
C
Bioactive Marine Natural Products Chemistry Research Unit, Department of Pharmacognosy, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand.
Suwanborirux
Khanit
K
Tanaka
Junichi
J
Yan
Yuling
Y
Sakata
Tomoyo
T
Marriott
Gerard
G
D016475:3T3 Cells; D000199:Actins / Q000032:analysis*; D000818:Animals; D002463:Cell Membrane Permeability; D005452:Fluoresceins / Q000493:pharmacokinetics; D005454:Fluorescence Polarization; D031541:Fluorescence Resonance Energy Transfer; D005456:Fluorescent Dyes / Q000138:chemical synthesis* / Q000737:chemistry; D051379:Mice; D010080:Oxazoles / Q000493:pharmacokinetics; D012235:Rhodamines / Q000493:pharmacokinetics
D000199:Actins; D005452:Fluoresceins; D005456:Fluorescent Dyes; D010080:Oxazoles; D012235:Rhodamines; C489776:kabiramide C; C005358:tetramethylrhodamine; C034357:fluorescein diester