Hiro Imachi

LPSN becomes an ELIXIR Core Data Resource! This database tracks bacterial names, aiding scientists worldwide. Easier microbe research ahead.
Press release: tinyurl.com/fuud42xk

#ScienceNews #Microbiology #Innovation #BioData

Isolation of Crenothrix bacteria reveals the distinct ecophysiologies of filamentous methanotrophs and adaptations to redox stress At the dawn of modern microbiology, Cohn observed abundant filamentous bacteria in drinking water wells that he named Crenothrix polyspora. Subsequent research has revealed the methanotrophic metaboli...

A quick microbio present before the holidays 🎁 >150 years after their first description, filamentous "Crenothrix bacteria" are now in stable laboratory culture! In our pre-print, we probe the unique physiology & ecology of the "lacustrine" group of these enigmatic methane-oxidizing microbes... 1/2

My article on aeonophiles (ultra-long lived organisms) came out in Aeon Magazine today!

An Asgard Archaeon (Lokiarchaeum ossiferum) growing and retracting its arms

In particular, Philipp’s dedication and hard work in establishing anaerobic live-cell imaging truly deserve heartfelt admiration.

Thank you for your comments!
This study was led by Philipp Radler (@radler92.bsky.social) from Christa Schleper’s lab (@christaschleper.bsky.social), and almost all of the key experiments were carried out by the Austrian team centered at the University of Vienna.

Expansion of aerobic methanotrophy to the phylum of Actinomycetota and its environmental implications | Applied and Environmental Microbiology The climate crisis is one of the most imminent threats to humanity and all life on our planet. Methane is not only the second most potent greenhouse gas (GHG) and is responsible for approximately 31% of GHG-induced global warming since the start of the industrial revolution (1) but is also the most rapid increasing GHG in the atmosphere (2). The latter is likely caused by increased microbiological production of methane from, e.g., wetlands (2). This fact stresses the importance of methanotrophic microbes that can degrade methane with and without oxygen (3, 4) and thereby fulfill a crucial role in our global climate.

Wow, our AEM paper on a new methane-oxidizing bacterium just got a Commentary! 🎉
Congrats Kambara-san—so happy to see the work getting recognized!
journals.asm.org/doi/10.1128/...

First isolation of a methanotrophic Mycobacterium reveals ammonia- and pH-tolerant methane oxidation | Applied and Environmental Microbiology Methane is a significant contributor to climate change (27 times more potent as a greenhouse gas than carbon dioxide), and the largest biological sink is methane-oxidizing bacteria: methanotrophs. Alt...

“Isolation of a new methanotroph belonging to Mycobacterium” is now out! Awesome work by my former postdoc Hiromi Kambara, who led this project all the way.
journals.asm.org/doi/10.1128/...

JAMSTEC Young Research Fellow (JYRF) | JAMSTEC - JAPAN AGENCY FOR MARINE-EARTH SCIENCE AND TECHNOLOGY JAMSTEC Young Research Fellow (JYRF)

Would you like to work with us?
At JAMSTEC, we are recruiting postdoctoral researchers through the Young Research Fellow program.
This program allows fellows to independently pursue their own research projects.
www.jamstec.go.jp/recruit/e/jy...

New paper out!
We discovered a tiny archaeon with the smallest known archaeal genome — only 238 kbp!
Candidatus Sukunaarchaeum mirabile has almost no recognizable metabolic pathways and may rely heavily on a host to survive.
It also represents a novel, deep-branching lineage in the archaeal tree.

schaechter.asmblog.org/schaechter/2...
#MicroSky #Archaea #ArchaeaSky #SymbioSky

HC1 is capable of tolerating low oxygen levels. In contrast, SC1 appears unable to do so, likely because it lacks genes related to oxygen metabolism. We believe this difference stems from the fact that SC1 was cultured from the beginning under strictly anaerobic conditions with reducing agents.

Thank you again for introducing our work!
I'd greatly appreciate it if you could correct one point in episode #4.

schaechter.asmblog.org/schaechter/2...
#MicroSky #Archaea #ArchaeaSky #SymbioSky

Lokiarchaeia is MBG-B, not MBG-D.

Cultivation of previously uncultured microorganisms with a continuous-flow down-flow hanging sponge (DHS) bioreactor, using a syntrophic archaeon culture obtained from deep marine sediment as a case s... This two-stage bioreactor-mediated approach for culturing previously uncultured microorganisms involves enrichment of indigenous organisms by using a continuous-flow down-flow hanging sponge bioreacto...

We have also published a paper on how to construct and operate a DHS bioreactor and isolate anaerobic microorganisms.
www.nature.com/articles/s41...

A Long-Term Cultivation of an Anaerobic Methane-Oxidizing Microbial Community from Deep-Sea Methane-Seep Sediment Using a Continuous-Flow Bioreactor Anaerobic oxidation of methane (AOM) in marine sediments is an important global methane sink, but the physiological characteristics of AOM-associated microorganisms remain poorly understood. Here we r...

MK-D1 was not isolated from this bioreactor. The correct reference is as follows.
journals.plos.org/plosone/arti...

MK-D1 was isolated from marine sediment collected from a methane seep approximately 2500 meters deep in the Nankai Trough off the Kii Peninsula in Japan, not from a drill core sample collected off the Shimokita Peninsula.

Thank you so much for introducing our work!
Could you kindly make the following corrections to story #1?

The genomic information for our strains, which belong to the ‘Hodarchaeales', has been released. Due to a large-scale server replacement at DDBJ (DNA Database of Japan), the release has been delayed.

Eukaryotes' closest relatives are internally simple syntrophic archaea Eukaryotes are theorized to have originated from an archaeal phylum Promethearchaeota (formerly 'Asgard' archaea)1,2. The first cultured representatives revealed valuable insight3,4 but are distantly ...

New isolates from eukaryote's closest archaeal relative: ‘Hodarchaeales’!! Syntrophic microaerotolerant peptide-degrading anaerobic archaea w/ simple cell structure & protrusions. Features conserved across the phylum provide new insight into our ancestor’s biology!
www.biorxiv.org/content/10.1...

Thank you for the kind comments!

Thank you for the kind comment!

Thank you!

Eukaryotes' closest relatives are internally simple syntrophic archaea Eukaryotes are theorized to have originated from an archaeal phylum Promethearchaeota (formerly 'Asgard' archaea)1,2. The first cultured representatives revealed valuable insight3,4 but are distantly ...

Isolated in just 3 years! (previously, 12 years). We obtained two strains from 'Hodarchaeales', proposed to be closest to our archaeal ancestor. Our analysis suggests the ancestor was an anaerobic, syntrophic, peptidotrophic, archaeon with a simple intracellular structure and possible aerotolerance.

Minisyncoccus archaeiphilus gen. nov., sp. nov., a mesophilic, obligate parasitic bacterium and proposal of Minisyncoccaceae fam. nov., Minisyncoccales ord. nov., Minisyncoccia class. nov. and Minisyn... In the domain Bacteria, one of the largest, most diverse and environmentally ubiquitous phylogenetic groups, Candidatus Patescibacteria (also known as candidate phyla radiation/CPR), remains poorly ch...

New bacterial phylum Minisyncoccota (formerly Ca. Patescibacteria or CPR) in the kingdom Bacillati.

Congratulations, Kuroda-san, Narihiro-san, and Nobu (@masarunobu.bsky.social)!

www.microbiologyresearch.org/content/jour...

Methanol syntrophy!
A new form of syntrophic relationship between bacteria and archaea in the underground.

Congratulations, Huang-san and Nobu!

Engineering history with Asgard archaea of the kingdom Promethearchaeati - Nature Microbiology Multiple histories converge in Masaru Nobu’s story of culturing an archaeon closely related to us eukaryotes.

Why did an engineer become a researcher in biological evolution? My esteemed research partner, colleague, and friend, Masaru K. Nobu, is sharing some side stories about strain MK-D1 research.
www.nature.com/articles/s41...

I’m currently trying to isolate uncultivated deep-sea sedimentary microorganisms using the reactor enrichment as an inoculum. If you happen to have time, I would be honored if you could take a look at a paper I published two years ago, where I provide more details about the reactor.

I’m truly grateful for the warm welcome—thank you so much!

I apologize for the confusion. To clarify, I’ve been supplying 0.57L of anaerobic medium to the reactor each day, which brings the total to 3733L so far. Also, my reactor will be turning 18 on December 28th.