マツウラ　トオル   MATSUURA TORU   松浦　徹    所属   関西医科大学  病理学講座    職種   講師
論文種別	原著(症例報告除く)
言語種別	英語
査読の有無	査読あり
表題	Auto-luminescent genetically-encoded ratiometric indicator for real-time Ca2+ imaging at the single cell level
掲載誌名	正式名：PLOS ONE 略　 称：PLOS ONE ISSNコード：19326203
掲載区分	国外
巻・号・頁	5(4),pp.e9935
著者・共著者	Kenta Saito, Noriyuki Hatsugai, Kazuki Horikawa, Kentaro Kobayashi, Toru Matsu-ura, Katsuhiko Mikoshiba, Takeharu Nagai
発行年月	2010/04
概要	BACKGROUND: Efficient bioluminescence resonance energy transfer (BRET) from a bioluminescent protein to a fluorescent protein with high fluorescent quantum yield has been utilized to enhance luminescence intensity, allowing single-cell imaging in near real time without external light illumination. METHODOLOGY/PRINCIPAL FINDINGS: We applied BRET to develop an autoluminescent Ca(2+) indicator, BRAC, which is composed of Ca(2+)-binding protein, calmodulin, and its target peptide, M13, sandwiched between a yellow fluorescent protein variant, Venus, and an enhanced Renilla luciferase, RLuc8. Adjusting the relative dipole orientation of the luminescent protein's chromophores improved the dynamic range of BRET signal change in BRAC up to 60%, which is the largest dynamic range among BRET-based indicators reported so far. Using BRAC, we demonstrated successful visualization of Ca(2+) dynamics at the single-cell level with temporal resolution at 1 Hz. Moreover, BRAC signals were acquired by ratiometric imaging capable of canceling out Ca(2+)-independent signal drifts due to change in cell shape, focus shift, etc. CONCLUSIONS/SIGNIFICANCE: The brightness and large dynamic range of BRAC should facilitate high-sensitive Ca(2+) imaging not only in single live cells but also in small living subjects.