title: Photoactive yellow protein-based protein labeling system with turn-on fluorescence intensity.
abstract: Protein labeling provides significant information about protein function. In this research, we developed a novel protein labeling technique by utilizing photoactive yellow protein (PYP). PYP is a small protein (14 kDa) derived from purple bacteria and binds to 7-hydroxycoumarin-3-carboxylic acid as well as to a natural ligand, 4-hydroxycinnamic acid, through a thioester bond with Cys69. Based on the structure and fluorescence property of this coumarin derivative, we designed two fluorescent probes that bind to PYP. One has an azido moiety, which allows stepwise labeling by click chemistry, and the other is a fluorogenic probe. The live-cell imaging and specific labeling of PYP were achieved by using both probes. The flexibility of the probe design and the small size of the tag protein are great advantages of this system against the existing methods. This novel labeling technique can be used in a wide variety of applications for biological research.
authors.affiliation: Division of Advanced Science and Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.
authors.forename: Yuichiro
authors.initials: Y
authors.lastname: Hori
authors.forename: Hideki
authors.initials: H
authors.lastname: Ueno
authors.forename: Shin
authors.initials: S
authors.lastname: Mizukami
authors.forename: Kazuya
authors.initials: K
authors.lastname: Kikuchi
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry*; D003373:Coumaric Acids / Q000737:chemistry; D003545:Cysteine / Q000737:chemistry; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D057054:Molecular Imaging / Q000379:methods*; D020283:Photoreceptors, Microbial / Q000737:chemistry*; D011422:Propionates; D014468:Umbelliferones / Q000737:chemistry
chemical_list: C106879:7-hydroxycoumarin-3-carboxylic acid; D001426:Bacterial Proteins; D003373:Coumaric Acids; D005456:Fluorescent Dyes; D020283:Photoreceptors, Microbial; D011422:Propionates; D014468:Umbelliferones; C050162:photoactive yellow protein, Bacteria; C495469:p-coumaric acid; D003545:Cysteine