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Seismological Structures on Bimodal Distribution of Deep Tectonic Tremor 期刊论文
Geophysical Research Letters, 2021
作者:  Yasunori Sawaki;  Yoshihiro Ito;  Kazuaki Ohta;  Takuo Shibutani;  Tomotaka Iwata
收藏  |  浏览/下载:18/0  |  提交时间:2021/04/12
Water depth dependence of long‐range correlation in nontidal variations in seafloor pressure 期刊论文
Geophysical Research Letters, 2021
作者:  Tomohiro Inoue;  Yoshihiro Ito;  Laura M. Wallace;  Yutaka Yoshikawa;  Daisuke Inazu;  Emmanuel Soliman M. Garcia;  Tomoya Muramoto;  Spahr C. Webb;  Kazuaki Ohta;  Syuichi Suzuki;  Ryota Hino
收藏  |  浏览/下载:40/0  |  提交时间:2021/04/06
Isolation of an archaeon at the prokaryote-eukaryote interface 期刊论文
NATURE, 2020, 577 (7791) : 519-+
作者:  Imachi, Hiroyuki;  Nobu, Masaru K.;  Nakahara, Nozomi;  Morono, Yuki;  Ogawara, Miyuki;  Takaki, Yoshihiro;  Takano, Yoshinori;  Uematsu, Katsuyuki;  Ikuta, Tetsuro;  Ito, Motoo;  Matsui, Yohei;  Miyazaki, Masayuki;  Murata, Kazuyoshi;  Saito, Yumi;  Sakai, Sanae;  Song, Chihong;  Tasumi, Eiji;  Yamanaka, Yuko;  Yamaguchi, Takashi;  Kamagata, Yoichi;  Tamaki, Hideyuki;  Takai, Ken
收藏  |  浏览/下载:25/0  |  提交时间:2020/07/03

The origin of eukaryotes remains unclear(1-4). Current data suggest that eukaryotes may have emerged from an archaeal lineage known as '  Asgard'  archaea(5,6). Despite the eukaryote-like genomic features that are found in these archaea, the evolutionary transition from archaea to eukaryotes remains unclear, owing to the lack of cultured representatives and corresponding physiological insights. Here we report the decade-long isolation of an Asgard archaeon related to Lokiarchaeota from deep marine sediment. The archaeon-'  Candidatus Prometheoarchaeum syntrophicum'  strain MK-D1-is an anaerobic, extremely slow-growing, small coccus (around 550 nm in diameter) that degrades amino acids through syntrophy. Although eukaryote-like intracellular complexes have been proposed for Asgard archaea(6), the isolate has no visible organelle-like structure. Instead, Ca. P. syntrophicum is morphologically complex and has unique protrusions that are long and often branching. On the basis of the available data obtained from cultivation and genomics, and reasoned interpretations of the existing literature, we propose a hypothetical model for eukaryogenesis, termed the entangle-engulf-endogenize (also known as E-3) model.


Isolation and characterization of an archaeon that is most closely related to eukaryotes reveals insights into how eukaryotes may have evolved from prokaryotes.


  
Phase separation organizes the site of autophagosome formation 期刊论文
NATURE, 2020, 578 (7794) : 301-+
作者:  Imachi, Hiroyuki;  Nobu, Masaru K.;  Nakahara, Nozomi;  Morono, Yuki;  Ogawara, Miyuki;  Takaki, Yoshihiro;  Takano, Yoshinori;  Uematsu, Katsuyuki;  Ikuta, Tetsuro;  Ito, Motoo;  Matsui, Yohei;  Miyazaki, Masayuki;  Murata, Kazuyoshi;  Saito, Yumi;  Sakai, Sanae;  Song, Chihong;  Tasumi, Eiji;  Yamanaka, Yuko;  Yamaguchi, Takashi;  Kamagata, Yoichi;  Tamaki, Hideyuki;  Takai, Ken
收藏  |  浏览/下载:53/0  |  提交时间:2020/07/03

The pre-autophagosomal structure in yeast is a liquid-like condensate of Atg proteins whose phase separation may have a critical, active role in autophagy.


Many biomolecules undergo liquid-liquid phase separation to form liquid-like condensates that mediate diverse cellular functions(1,2). Autophagy is able to degrade such condensates using autophagosomes-double-membrane structures that are synthesized de novo at the pre-autophagosomal structure (PAS) in yeast(3-5). Whereas Atg proteins that associate with the PAS have been characterized, the physicochemical and functional properties of the PAS remain unclear owing to its small size and fragility. Here we show that the PAS is in fact a liquid-like condensate of Atg proteins. The autophagy-initiating Atg1 complex undergoes phase separation to form liquid droplets in vitro, and point mutations or phosphorylation that inhibit phase separation impair PAS formation in vivo. In vitro experiments show that Atg1-complex droplets can be tethered to membranes via specific protein-protein interactions, explaining the vacuolar membrane localization of the PAS in vivo. We propose that phase separation has a critical, active role in autophagy, whereby it organizes the autophagy machinery at the PAS.


  
Tremor and Inferred Slow Silo Associated With Afterslip of the 2011 Tohoku Earthquake 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (9) : 4591-4598
作者:  Ohta, Kazuaki;  Ito, Yoshihiro;  Hino, Ryota;  Ohyanagi, Shukei;  Matsuzawa, Takanori;  Shiobara, Hajime;  Shinohara, Masanao
收藏  |  浏览/下载:10/0  |  提交时间:2019/11/26
Seafloor Crustal Deformation on Ocean Bottom Pressure Records With Nontidal Variability Corrections: Application to Hikurangi Margin, New Zealand 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (1) : 303-310
作者:  Muramoto, Tomoya;  Ito, Yoshihiro;  Inazu, Daisuke;  Wallace, Laura M.;  Hino, Ryota;  Suzuki, Syuichi;  Webb, Spahr C.;  Henrys, Stuart
收藏  |  浏览/下载:16/0  |  提交时间:2019/04/09
ocean bottom pressure  seafloor geodesy  slow slip event  nontidal oceanic variation  instrument drift  
Coseismic slip propagation on the Tohoku plate boundary fault facilitated by slip-dependent weakening during slow fault slip 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (17)
作者:  Ito, Yoshihiro;  Ikari, Matt J.;  Ujiie, Kohtaro;  Kopf, Achim
收藏  |  浏览/下载:16/0  |  提交时间:2019/04/09