Chemical Communications Blog

We are excited to share the success of Kourosh Ebrahimi’s first-time independent article in ChemComm; “VITAS, a sensitive in vivo selection assay to discover enzymes producing antiviral natural products” included in the full milestones collection. 

Read our interview with Kourosh below.

What are the main areas of research in your lab and what motivated you to take this direction?

My lab research areas include Bioinorganic Immunology and Drug Discovery. We elucidate the function of metalloenzymes and iron-sulfur [FeS] clusters, one of the oldest bioinorganic cofactors of life, and [FeS] containing proteins in the immune response. We use the outcome of our work to design and engineer biological systems for synthesizing and developing novel therapeutics. We apply a multidisciplinary approach combining protein engineering, biochemical and biophysical techniques, molecular biology, and cell biological methods.

Can you set this article in a wider context?

The idea of the VITAS assay described in the article initially came to me in 2017, and I included the idea in an ERC starting grant. The available assays to discover enzymes producing antiviral natural products (NPs) are multi-step with a high risk of failure at each step: (i) Identification and selection of desired enzymes among the unlimited natural library of enzymes, which is a random process. (ii) Expression and purification of a functional enzyme, which is not straightforward, especially in the case of oxygen-sensitive [FeS] proteins. (iii) Identification and discovery of the correct substrates of enzymes and the NPs they produce. (iv) Purifying the NPs and confirming the antiviral activity using biochemical or cell-based assays. Consequently, the discovery of new antiviral enzymes and NPs is practically a random process with a very high risk of failure.

We developed VITAS (the Latin word for leaving), an in vivo selection assay for identifying enzymes producing antiviral lead NPs to solve the challenge. The assay is based on a simple concept: a commonly used bacterium in the lab, namely E. coli, should die if an antiviral enzyme is absent inside the cells. We engineered the bacterium so that it generates a toxin protein in the absence of an antiviral enzyme. This live/dead assay will enable us to rapidly screen many enzymes among the repository of natural proteins and a library of variants generated using protein engineering. When the assay is coupled with other methods like liquid chromatography-mass spectrometry, we can identify and discover novel antiviral lead NPs produced by enzymes.

What do you hope your lab can achieve in the coming year?

In the coming years, we hope to decode the molecular mechanism underlying the activity of a conserved antiviral response, discover new antiviral molecules, and design and create revolutionary approaches to antiviral therapeutics. This work is a milestone in our path to achieving our goals.

Describe your journey to becoming an independent researcher.

My journey has been unique. I did my Bachelor’s studies in Chemical Engineering, Petroleum Process Design. After my graduation, an unexpected and sudden accident changed everything. Because of that event, I decided to continue my studies in Biochemistry to understand the molecular mechanism of diseases like cancer. Yet, my first stop was working in the industry to help support my career ambitions. After five years, I found the opportunity to start my M.Sc. and, subsequently, PhD studies, both under the supervision of Prof Wilfred Hagen, TU Delft. I developed a passion for fundamental science and the mechanism of function of metalloenzymes. After my PhD, I did a one-year Postdoc in Virology at the Scripps Research Institute, Florida, USA, with Prof Michael Farzan. I returned to TU Delft and received a two-year fellowship from the European Molecular Biology Organization (EMBO) to move to the University of Oxford. I joined the group of Prof Frazer Armstrong. I initiated multiple collaborations with various groups across the University, including with Prof William James (Sir William Dunn School of Pathology) and Prof James McCullagh (Department of Chemistry). With their support, I developed my research niche at the interface of Bioinorganic Chemistry and Immunology/Virology. After six years working at Oxford, in October 2021, I joined the Institute of Pharmaceutical Sciences at King’s College London to start my independent career and establish my research group.

What is the best piece of advice you have ever been give?

A good scientist does everything possible to disprove their theories.

Why did you choose to publish in ChemComm?

After finalizing the draft of our manuscript, I was looking for a possible venue among highly respected journals in the field. While visiting the Chemical Communications website, I came across the Journal collection ‘ChemComm Milestones – First Independent Articles’. I was excited to see the support and recognition the Journal provides new investigators. I decided to submit our article to Chemical Communications without any second thought.

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I was born (on 26th December 1979) in Kerman, a small city near a desert in the south of Iran. After finishing my Bachelor’s studies, I worked in the petrochemical industry for five years. Subsequently, I received a scholarship from Delft University of Technology (TU Delft), the Netherlands, and did my M.Sc. and later PhD studies there. My PhD was followed by a postdoc at the Scripps Research Institute and then one at TU Delft. I received an EMBO fellowship and moved to Oxford at the end of 2015. In October 2021, I joined the Institute of Pharmaceutical Science at King’s College London as a Lecturer (Assistant Professor) in Immunology and Drug Discovery.   Social Handles: @Kouroshhe; @FeSImmChemNet; @kingsmedicine

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We are excited to share the success of Kun Jiang’s first-time independent article in ChemComm; “Top-down manufacturing of efficient CO2 reduction catalysts from the gasification residue carbon” included in the full milestones collection. 

Read our interview with Kun Jiang below.

What are the main areas of research in your lab and what motivated you to take this direction?

My group research focuses on the precise electrochemical synthesis, especially on the selective electrocatalytic conversion of atmosphere molecules like O₂/CO₂/H₂O into value-added chemicals and fuels. Aiming at this target, our lab has two primary research themes: 1) developing highly sensitive spectroelectrochemical techniques for operando interfacial study during these reactions, shedding light on the complex reaction pathways and the potential tuning knobs of local reaction environment; 2) rational design of gas diffusion electrode based electrochemical reactors with the insights from online diagnosis toward a more efficient energy conversion.

We believe such a synergetic approach from fundamental surface electrochemical investigation and practical pilot device validation could pave the development of more efficient electrosynthesis systems, aiding to envision the sustainable neutral carbon cycle.

Can you set this article in a wider context?

Electrochemical CO₂ reduction reaction (CO₂RR) has provided a promising route to close the anthropogenic carbon cycle by storing renewable electricity within greenhouse gas molecules and generating fuels and commodity chemicals. Among various aqueous CO₂RR products, CO is a simplest 2e^‒ product with a projected cost of $0.44 kg^–1, making the electrochemical CO₂-to-CO route be competitive to conventional processes and holding great significance for the chemical industry. In a recent work, we have demonstrated the role of local reaction environment, especially the electrode–electrolyte interface and the relevant hydrodynamic boundary layer in the vicinity of the cathode, in defining the activity and selectivity for Ag catalyzed CO₂-to-CO conversion (Energy Environ. Sci., 2022, 15, 749-759).

Along this line, we have developed a “top-down” strategy to manufacture Ni-N-C active motif enriched carbon catalysts rather than the coinage metal of Ag, for a selective and stable CO₂-to-CO conversion at ~45 L_CO g_catalyst^-1 h^-1 for more than 50-h continuous electrolysis at ambient condition. More importantly, we started the single atom catalyst fabrication from the raw material of gasification residue carbon from heavy hydrocarbon feedstock, demonstrating a carbon neutral cycle driven by a “solid carbon waste”.

What do you hope your lab can achieve in the coming year?

Currently we’re working on modulating local reaction environment toward selective CO₂-to-C₂₊ conversion. Both fundamental insights from advanced spectroelectrochemical techniques and practical electrolyzer performance optimization are going to be brought to light this year.

Describe your journey to becoming an independent researcher.

After finishing my undergraduate study of applied chemistry at Jinan University, I started my academic research in physical chemistry with Prof. Wen-Bin Cai at Fudan University. The dynamic interfacial electrochemistry of Pd catalyzed HCOOH dehydrogenation versus dehydration pathway ignited my passion for spectroelectrochemistry investigations.

After I finished my Ph.D in 2016, I took postdoctoral trainings with Prof. Haotian Wang at Harvard University, and with Prof. Alexis T. Bell at LBNL/UC Berkeley, for which I stayed focus on the cutting edge research field of electrochemically converting “CO₂ waste” into value-added chemicals and fuels with green energy input. These experiences have broadened my research area from surface electrochemistry into material science and chemical engineering, which granted me a widened academic horizon and collaboration.

Also based on these research experience, I took the PI position at SJTU and back to my home country in late 2019.  I currently lead a small group of 3 Ph.D candidates and 2 graduate students with a diverse education background of Mechanical Engineering, Chemical Engineering and Applied Chemistry, working on the emerging interdisciplinary research topics bridging the fundamental researches at lab with the sustainable future demands on circular carbon economy.

What is the best piece of advice you have ever been give?

In Chinese, we have a proverb saying “海纳百川，有容乃大”, which has been vividly expressed by President Bacow’s commencement remarks to the Harvard class of 2022:

“To save a seat for others, to make room for others, to ensure that the opportunities afforded by your education do not enrich your life alone.”

Why did you choose to publish in ChemComm?

In September of 2011, I published my very first 1^st-authored research paper at ChemComm as well. The rigorous peer-review process, amazing publication time and broad readership across all fields of chemistry make the journal a fantastic platform!

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Kun Jiang is currently an Associate Professor of Mechanical Engineering at Shanghai Jiao Tong University (SJTU). He obtained a Ph.D. degree in physical chemistry from Fudan University in 2016, held a Baden-Württemberg fellowship at Institute for Surface Chemistry and Catalysis, Ulm University, and completed postdoctoral trainings at Harvard, Lawrence Berkeley Laboratory and U.C. Berkeley. In 2019, he joined the School of Mechanical Engineering, Shanghai Jiao Tong University as a Principal Investigator, with the research focus of developing advanced reactor devices and spectroelectrochemical techniques for renewable energy utilization. Group website: https://jianglab.sjtu.edu.cn/

Explore more ChemComm Milestones news and updates on our Twitter: @ChemCommun

We are excited to share the success of Marcin Lindner’s first-time independent article in ChemComm; “V-shaped donor–acceptor organic emitters. A new approach towards efficient TADF OLED devices” included in the full milestones collection. 

Read our interview with Marcin below.

What are the main areas of research in your lab and what motivated you to take this direction?

Research in my group has focused on the rational design and the synthesis of functional aromatic materials such as concave N-doped polycyclic aromatic hydrocarbons (N-PAHs), curved heteroatom-doped nanographenes, donor-acceptor organic emitters with unique topology. These are investigated as emissive components in thermally activated delay fluorescent (TADF)/hyperfluorescent (HF) OLED devices, and hole-transporting layers (HTL) applied for more efficient throughput of Perovskite Solar Cells (PSCs). We have faced the challenge in constructing highly emissive organic materials by integrating donor-acceptor structure thoroughly fused and conjugated scaffold which bears, however, nonplanar geometry. We believe that implementation of such conceptually new, tailor-made organic materials would allow to holistically tune the desired optical properties such an efficient quantum yield, excited states energy difference, and bandgap energy.

Can you set this article in a wider context?

Seeking new organic emitters for TADF OLED devices has recently constituted an intensive field of research. Particularly, organic dyes with a small energy gap (ΔE_ST) which enable an efficient up-conversion process of triplet excitones are of high interest. The most common approach offered so far has relied on a use of rigid platforms decorated with twisted electron rich substituents to minimize HOMO-LUMO overlap which usually affects on ΔE_ST . We recently demonstrated first ambipolar and curved N-doped PAHs in which antiaromatic 7-memered ring led to the spatially separate HOMO-LUMO levels while curvature enabled one to minimize their overlap and achieve TADF emission (Angew. Chem. 2022, 61, e202202232) with PLQY up to 86% and EQE of 12%.

Building on that we envisaged the release of  the structural tension from our pristine N-PAHs would result in the system bearing V-shaped topology leading to a well decoupled donor-acceptor system. In this published paper, we showed the rational design and concise synthesis of a new set of V-shaped D-π-A organic emitters. “Releasing structural tension” from our parental architecture, we gained access to a novel class of dyes with V-shaped geometry, which was transparently proved by X-ray single crystal analysis. Furthermore, HOMO-LUMO levels were well separated leading to the remarkable decrease of ΔE_ST (<0.1eV for each derivative) and efficacious TADF process. For the best performing phenoxazine decorated dye, we found appreciable PLQY of 36% accompanied by a very good EQE of 13.6% which indeed stress the importance of the efficient up-conversion of triplet excitones due to the low ΔE_ST energy. These demonstrated results shed light on new structural paradigm that contributes strongly to the increase of TADF OLED effciency.

What do you hope your lab can achieve in the coming year?

We have currently aimed at developing a peripheral functionalization of our N-PAHs. Moreover, we have explored the synthetic methodologies toward curved nanographenes which are going to be brought to light this year.

Describe your journey to becoming an independent researcher.

After my PhD in the group of Prof. Marcel Mayor (University of Basel, KIT Karlsruhe), I returned to Poland (2017) where I spent a short period of time at the industry (Selvita). With this valuable experience in a hand, I subsequently moved to Warsaw (IOC PAS). Within next 1.5 year I had here tackled to the development of new anion receptors and catalytic methods for stereo-selective semi-hydrogenation of alkynes, working in a group of Prof. Janusz Jurczak and Karol Grela, respectively. Meantime (2018/2019) I successfully applied for my first independent research grant (within the frame of Sonata 14 competition) funded by National Centre of Science. Year after (2020) I received second grant, this time from the National Centre of Research and Development (Lider XI). Within the scope of my independent research I try to perform a unique approach to the synthesis of aromatic compounds with goal of reaching a specific functionality.

What is the best piece of advice you have ever been give?

Well, here I would come with two quotes. Namely, “treat other as you want to be treated” and “make people believe what you believe in”. Both help me on daily basis to gradually become a better leader.

Why did you choose to publish in ChemComm?

ChemComm is a journal with a long tradition and an excellent reputation in chemistry. As it is a so-called “general” type of journal, it is accessed by the broad society of researchers who often cross the borders of chemistry and physics. “Publish your results in a journal, you used to read”. This attitude of my former co-advisor Dr Michal Valášek, (KIT, Germany) which was transferred to my professional life and was a driving force to publish following manuscript in ChemComm.

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Marcin Lindner completed his PhD in 2016 at the University of Basel, Switzerland, under the guidance of Prof. Marcel Mayor. He defended a PhD dissertation entitled “Tailor-made tetraphenylmethanes : from surface decoartion to 3D organic polymers”. In 2017 he returned to Poland to work at Selvita as a Synthesis Specialist III. After this short adventure in industry he returned to academia (Institute of Organic Chemistry, Polish Academy of Science) to work with Prof. Janusz Jurczak (10/2017-01/2019) and Prof. Karol Grela (02-11/2019). Since 2019, has been employed as assistant professor and appointed a head of the Aromatic Functional Materials group at the IOC, PAS in Warsaw. Twitter: @lindner_marcin

Explore more ChemComm Milestones news and updates on our Twitter: @ChemCommun

We are excited to share the success of Manabu Yamada’s first-time independent article in ChemComm; “Facile separation of cyclic aliphatic and aromatic vapors using crystalline thiacalixarene assemblies with preorganized channels” included in the full milestones collection. 

Read our interview with Manabu below.

What are the main areas of research in your lab and what motivated you to take this direction?

Our laboratory has two primary research themes. The first involves the development of adsorbents that use organic crystals based on macrocyclic compounds (calixarenes, thiacalixarenes, and cyclodextrins) to effectively separate small organic molecules. The second involves the development of extractants and adsorbents based on macrocyclic compounds and pincer ligands to effectively separate rare (precious) metals.

We were motivated to conduct this research for the following reasons: during my research on organic crystals, I became fascinated by the beauty of crystals, as well as their interesting properties, such as the selective incorporation of characteristic organic vapor components. During my research on rare metal separators, I found that I enjoyed designing extractants to recognize and separate specific metals.

Can you set this article in a wider context?

Cyclohexane and methylcyclohexane were synthesized via the hydrogenation of benzene and toluene, respectively. However, the unreacted aromatic material remains in the effluent stream of the reactor during this process. The effective separation of the cyclic aliphatic and aromatic compounds via conventional distillation is impossible, and separations based on the size and molecular volumes are challenging.

To exploit the differences in molecular sizes and spatial structures of cyclohexane and benzene or those of methylcyclohexane and toluene, macrocyclic compounds have been utilized to separate cyclic alkane/aromatic hydrocarbon vapor mixtures. However, the separation of benzene/cyclohexane and toluene/methylcyclohexane mixtures using one type of macrocyclic compound has not yet been achieved.

At this time, we found that the facile and efficient separation of both benzene/cyclohexane and toluene/methylcyclohexane mixtures can be achieved using one type of crystalline thiacalxarene assembly featuring preorganized channel-like adsorption sites, which possess the adsorption properties of cyclic aliphatics and aromatics and the different retention capacities of each adsorbed molecule.

What do you hope your lab can achieve in the coming year?

In the future, we will investigate the adsorption properties of polar organic molecules using crystalline thiacalixarene assemblies. In addition, we will attempt to develop novel organic crystals based on other macrocyclic compounds and evaluate their adsorption and separation properties for small organic molecules.

Describe your journey to becoming an independent researcher.

I decided to become a researcher when I was a Ph.D. student under Prof. Fumio Hamada at Akita University. I was fascinated by the inclusion phenomena of macrocyclic compounds and the beauty of macrocycle-based organic crystals. After graduation, I worked as a postdoctoral researcher at the Akita University Venture Business Laboratory in the field of supramolecular chemistry. I was then hired as a tenure-track assistant professor in the tenure-track program for young faculty members in the field of mineral resource research at Akita University, where I took on the challenge of a new research field: the development of extractants that can efficiently recover platinum group metals. Fortunately, with the support of my superiors, I became an independent researcher.

What is the best piece of advice you have ever been give?

I do not know if this is good advice for everyone, but I was once told, “the only privilege of a chemist is to be able to converse with compounds.” This is what I keep in mind as I continue my research. I believe this is the best advice I have ever received, as it has made me realize the importance of enjoying chemistry on a daily basis.

Why did you choose to publish in ChemComm?

ChemComm is a high-impact journal read by chemists across a wide range of fields. Additionally, it publishes research articles that are novel, urgent, and very compelling. These attributes are what motivated me to publish my article in ChemComm.

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Manabu Yamada completed his PhD at Akita University, Japan, under the guidance of Prof. Fumio Hamada, where he explored the crystal structures of metal complexes of macrocyclic compounds. He then spent approximately two years as a postdoctoral researcher at the Akita University Venture Business Laboratory, Japan. In 2012, he accepted a tenure-track assistant-professorship at Akita University, working on the development of new extractants for the recovery of rare metals from secondary resources. He was appointed principal investigator of this project in 2017. Since 2022, he has been an Associate Professor at Akita University, with a research focus on the development of extractants and sorbents for the effective and selective separation of metals and small organic compounds. Twitter: @Akita_Lab ResearchGate: https://www.researchgate.net/profile/Manabu-Yamada-2

Explore more ChemComm Milestones news and updates on our Twitter: @ChemCommun