Immuno-detection of mRNA-binding protein complex in human cells under transmission electron microscopy.

Abstract:

:Transit from the nuclear complex to the cytoplasm through the nuclear pore complex permits modification of mRNA, including processing such as splicing, capping, and polyadenylation, etc. At each of these events, mRNA interacts with various proteins to form mRNA-protein complex. Visualizing the mRNA is crucial for understanding the mechanisms underlying mRNA processing and elucidating its structure and recent advances in mRNA imaging allow detection of real-time mRNA localization in living cells. However, these techniques revealed only the location of mRNA but cannot visualize the conformation of mRNA-protein complex in cells. On the other hand, transmission electron microscopy has been used to visualize the structure of the Balbiani ring-derived large mRNA, but their observations were limited to the insect cells. In this study, we visualized the structure of mRNA-protein complex in human culture cells by using immuno-electron microscopy. Through immuno-detection, an mRNA exon junction binding complex Y14, and its binding protien Upf2, different gold particle patterns were imaged with transmission electron microscopy and analyzed. Characteristic linear and stacked particle orientation were observed. Across the nuclear membrane, only linear aggregation pattern was observed, whereas the stacked aggregation pattern was detected in the cytoplasm. Our method is able to visualize mRNA-conformation and applicable to many cell types, including mammalian cells, where genes can easily be manipulated.

journal_name

Microsc Res Tech

authors

Ma Q,Tatsuno T,Nakamura Y,Izumi SI,Tomosugi N,Ishigaki Y

doi

10.1002/jemt.23214

subject

Has Abstract

pub_date

2019-06-01 00:00:00

pages

680-688

issue

6

eissn

1059-910X

issn

1097-0029

journal_volume

82

pub_type

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