Biotechnology of metalloproteins and
BMBF Junior Research Group "CoMet"

Research group led by Dr. Darja Deobald


Group picture
1. row: Simon Klaes, Merle Romig (co-supervision with SOMA Dept.), Marie Eberwein, Ines Mäusezahl; 2. row: Wajeeha Mehak, Dr. Jesica Soder-Walz, Dr. Ingrid Meyer Cifuentes; 3. row: Dr. Darja Deobald, Raphael Kaiser, Nadine Hellmold.
In our group, we focus on investigating microbial anoxic respiration processes and the proteins involved in various steps of energy conservation. Our primary research centers on the isolation of homologous proteins, heterologous protein production, and characterization of the membrane-bound respiration complex from Dehalococcoides mccartyi strain CBDB1. These strains exhibit a highly unique metabolism, conserving energy through a process called organohalide respiration (OHR). In OHR, toxic and persistent chlorinated and brominated organic compounds, such as phenol, benzene, aniline, and dioxin, are reductively dehalogenated.
To gain deeper insights into the organization and functionality of this protein complex, we employ a range of advanced biochemical techniques. These include detergent-based solubilization, purification and enrichment using various chromatographic methods, blue native-PAGE, and heterologous production. These efforts are further complemented by mass spectrometry to analyze and characterize the complex in detail.

General workflow

We are also deeply interested in studying metabolic processes that are highly conserved in microorganisms with ancient traits, such as Dehalococcoidia. By identifying, purifying, and characterizing the proteins involved in these "primordial" metabolic pathways, we aim to illuminate the early evolution of proteins and life itself. This research allows us to better understand how anoxic processes, along with specific proteins, contributed to the origin and evolution of life and how they continue to influence natural and artificial matter cycles today.
Ultimately, our group seeks to develop foundational concepts across various scientific fields based on insights gained from our fundamental research. We strive to translate these concepts into practical applications, bridging the gap between basic science and real-world systems.

The "CoMet" project, funded by BMBF (grant number: 031B1507) aims to explore a modular and adaptable cobalamin (B12)-dependent methylation system in which the B12 shuttle protein serves as a central mediator, transferring methyl groups between various donor and acceptor molecules. This system should enable diverse biological methylation reactions in a highly modular manner.

Logo

The proposed B12 methylation system offers a sustainable approach to biological methylation processes by utilizing simple C1 compounds, such as methanol or acetate, as methyl donors for methyltransferase I. These C1 compounds can be produced on an industrial scale via electrochemical CO2 reduction, effectively functioning as a CO2 sink. Methyltransferase I facilitates the methylation of the B12 shuttle protein, which in turn drives subsequent methylation reactions.
Additionally, this system reduces dependency on fossil raw materials by incorporating substrates derived from microbial processes, such as medium- and long-chain fatty acids and alcohols, as well as renewable resources and waste streams. These substrates can serve as methyl acceptors for methyltransferase II, which is responsible for transferring methyl groups to a variety of acceptor molecules, further broadening the system’s applicability and environmental benefits.

Our laboratory is equipped with a high-resolution mass spectrometer (nLC-MS/MS, Thermo Orbitrap Fusion) for the identification of proteins and metabolites, along with advanced data processing pipelines. We are pleased to offer measurement time for collaborations on environmental topics, whether through scientific partnerships or on a commercial basis.

Group members

Students are warmly welcome to take part in our research during their Master or Bachelor thesis projects. We accept unsolicited applications at any time at darja.deobald@ufz.de

Scientists

PhD students

Technician

Ines Mäusezahl

Master and Bachelor students

Raphael Kaiser

Former students and members

Max Alexander Klamke
Rebecca Klemencic
Julian Waldhauer
Muhammad Jan Brohi