Sequential double fluorescent detections of total proteins and phosphoproteins in SDS-PAGE.
A fluorescent staining technique, using selective chelation with fluorophore and metal ion to the phosphate groups of phosphoproteins in SDS-PAGE is described. As a fluorescent dye and a metal ion, Fura 2 pentapotassium salt and Al(3+) were employed, respectively. The staining method, Fura 2 stain, has sensitivities of 16-32 ng of α-casein and β-casein, 62 ng of ovalbumin, phosvitin, and κ-casein using an ultraviolet transilluminator. Furthermore, Fura 2 stain is able to carry out continuative double detection of total proteins and phosphoproteins on the same gel within 3.5 h. Consequently, selective phosphoprotein and total protein detections could be obtained without other poststaining. Considering the low cost, simplicity, and speed, Fura 2 staining may provide great practicalities in routine phosphoproteomics research.
College of Pharmacy & Research Institute of Drug Development, Chonnam National University, Gwangju, South Korea.
Sun-Young
SY
Hwang
Xu
X
Wang
Wei-Tao
WT
Cong
Li-Tai
LT
Jin
Jung-Kap
JK
Choi
D000535:Aluminum / Q000032:analysis*; D000818:Animals; D002364:Caseins / Q000032:analysis; D002412:Cations / Q000032:analysis; D002417:Cattle; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods*; D005456:Fluorescent Dyes / Q000032:analysis*; D016257:Fura-2 / Q000032:analysis*; D006736:Horses; D010047:Ovalbumin / Q000032:analysis; D010750:Phosphoproteins / Q000032:analysis*; D011506:Proteins / Q000032:analysis*; D013194:Staining and Labeling / Q000379:methods
D002364:Caseins; D002412:Cations; D005456:Fluorescent Dyes; D010750:Phosphoproteins; D011506:Proteins; D010047:Ovalbumin; D000535:Aluminum; D016257:Fura-2
Aluminum; Fluorescent detection; Fura 2; Phosphoprotein; Pro-Q Diamond; SDS-PAGE