We have a new publication out in mSphere regarding how enterococcal PrgU provides additional layer of complexity to pheromone controlled conjugative plasmids in Gram-positive bacteria!
Apply here: Postdoc fellowship available in Karina Persson’s lab
If you are interested in membrane proteins and structural biology and want to use a blend mentods: X-ray crystallography, cryo-EM and protein chemistry- please apply. It is a fellowship for two years funded by Carl Trygger foundations.
The Berntsson lab at the department of Medical Biochemistry and Biophysics at Umeå University, Sweden, is recruiting one postdoctoral fellow (funded by the Kempe Foundation) to study the structural and functional aspects of Type 4 Secretion Systems. These large protein complexes are responsible for horizontal gene transfer between bacteria. As such, they facilitate the spread of antibiotic resistance genes and virulence factors between bacteria, both intra- and interspecies.
The overall goal of this project is to study the assembly and structure of the membrane channel of Gram-positive Type 4 Secretion Systems, with the aim of deducing their structure via cryo-EM. Initial work on this project has already been done, with a focus on the individual components of the channel (both unpublished data and Jäger et al, 2020, bioRxiv doi: 10.1101/2020.10.30.342212), which we will now build upon. Here at Umeå University we have access to excellent facilities to perform integrated structural biology projects, including a state-of-the-art cryo-EM facility (https://tinyurl.com/b2szms7z).
Applicants must possess a PhD, or another diploma deemed equivalent to a PhD, within molecular biology, biochemistry, structural biology or a related field. Furthermore, the applicant must have practical experience and expertise of cloning, protein production and purification in/from bacteria. Previous experience with cryo-EM (single particle analysis or electron tomography) is highly desirable. Previous experience of working with membrane proteins is an advantage, as is experience with Gram-positive bacteria, like E. faecalis. The applicant must have a very good level of English, both written and spoken. To fit into our team, applicants are expected to be good team players, but they should also be able to work independently.
The application should consist of the following:
- A motivation letter (max 1 A4), where you highlight why you want to join the lab and study T4SSs. This letter must also include your contact information.
- The Curriculum Vitae of the applicant, including a list of published peer-reviewed articles.
- Copies of the PhD diploma (or equivalent).
- Contact details for three references, of which one should be your PhD supervisor.
The duration of the fellowship, which is a tax-free stipend, is 2 years. Your application should be written in English and prepared as a single package in PDF format, to be submitted to firstname.lastname@example.org. Make sure to use the subject line: “postdoc application 2021-05” in the application email. Submit the application on May 21st, 2021 at the latest. The top ranked candidates will be contacted within two weeks from the closing date for an interview. Starting date will be according to agreement (and of course what the current pandemic situation allows). For more information about the research or other details, please contact Dr. Ronnie Berntsson.
We are looking for a motivated research student with a strong interest in structure biology, biophysics and biochemistry.
Job descriptions and general specifications of the PhD position are available on the following recruitment website:
Application deadline is 10th Dec 2020
The article “In situ assembly of choline acetyltransferase ligands by a hydrothiolation reaction reveals key determinants for inhibitor design” was just published in Angewandte Chemie.
We have discovered the strutcural basis for GTP vs. ATP selectivity in the NMP kinase family of enyzmes. The results are published in Biochemistry
We are very happy that Jonas Barandun was awarded the ERC Starting Grant 2020! More info here.
A new article from the Berntsson lab, with Dr. Andreas Schmitt as lead author, has just been accepted in the Journal of Molecular Biology, see here for the full (curently pre-proof version) article.
A PhD position in biochemistry is available in the laboratory of Professor Magnus Wolf-Watz at the Department of Chemistry, Umeå University, Sweden. The PhD project is aimed at uncovering novel molecular mechanisms underlying the function of human protein kinases. Focus will be on two specific protein kinases that are intimately linked to a number of disorders in humans including various forms of cancer. The doctoral student will enter a multidisciplinary project that is built on collaborations with both Professor Kwangho Nam at University of Texas Arlington and with Marené Landström (Professor in pathology at Umeå University). The doctoral student will be trained in structural biology, protein production, biochemistry and biophysics and will collaborate with both cell biologists and computational chemists. Structural biology may go in any of the directions; single particle cryo EM, x-ray crystallography or protein NMR spectroscopy depending on the development of the research project and also depending on the interests of the doctoral student. The position is in part funded by the National Institute of Health (NIH).
Please contact email@example.com for more information
Click here for the on-line application https://umu.varbi.com/se/what:job/jobID:328538/
Up to 3 postdoctoral fellowships are open for the 2020 call at the Integrated Structural Biology (ISB) environment at Umeå University. Umeå University offers a vibrant and international atmosphere for structural biology research. There are 19 research groups and close to 100 persons affiliated with ISB. The ISB environment has regular seminars and candidates will be broadly exposed to different structural biology techniques. The university has state of the art infrastructure for cryoEM, NMR spectroscopy, supercomputing and x-ray crystallography (please visit www.biostruct.umu.se for details on research groups and equipment).
The openings will be filled using a procedure adapted from EMBL and up to 3 top candidates that has applied to one of the 7 available projects will be selected. The projects are interdisciplinary and will ensure that the candidate will receive competitive training.
The program is open to all nationalities with relevant doctoral level education and work experiences and the openings will include the following to be considered by potential candidates:
- Two years funding (incl. running costs) for research within a multidisciplinary structural biology environment
- Access to ISB affiliated core facilities and technical platforms
- Integration with postdocs at ISB and also MIMS (Molecular Infection Medicine Sweden) for carrier development and joint activities
Candidates should submit their:
- Certificates and diplomas
- A Motivation Letter (max 2 A4 pages), specifying: i) why you are interested in performing postdoc research studies within ISB and ii) why in particular you wish to do this with the PI:s and project idea selected from our list.
- Reseach plan for the project (max 1 A4 page). We strongly encourage the applicants to contact the PIs for discussion of the project before submission.
Please email your application to ISB@umu.se no later than April 13. For inquires please contact the indicated lead-PI or co-PI’s from the list of projects. Further info about the ISB Postdoctoral program can be found here: https://www.biostruct.umu.se/isb-postdoctoral-program/
Please find here below a list of the available projects together with contact information to PI’s.
Membrane interactions during apoptosis – a data-driven simulation approach
The grand challenge in low-resolution structural biology methodologies is the structural interpretation of the data. In recent years, data-driven computer simulation has emerged as a powerful tool with huge potential to extract detailed structural information from low- resolution data due to ever-increasing capabilities in parallel supercomputing and novel algorithms. The main aim of this postdoc project is to develop a data-driven simulation method to elucidate the mechanism behind the association of apoptotic Bax protein to mitochondrial-membrane interfaces and its subsequent partitioning; information essential for a molecular understanding of a key step in apoptosis, namely the cell-death causing membrane perforation.
The work includes building of simulation systems to mimic the mitochondrial lipid composition under apoptotic oxidative stress conditions, hydration levels, and protein content, as used in the neutron reflectometry experiments. A computationally efficient way to generate in-simulation calculated scattering profiles will be developed to bias simulations towards a molecular-level structural solution; work to be supervised by Dr. Andersson. Importantly, the postdoc will be involved in sample preparation and all stages of the neutron scattering experiments, supervised by Dr. Gröbner (and preliminary data already at hand). The project will generate new insight into a key step in mitochondrial apoptosis and it will put forward a data-driven approach that goes beyond today’s state-of- the-art to model neutron reflectometry data; which will be required at the upcoming national ESS infrastructure with its innovative reflectometry capabilities.
Lead PI: Magnus Andersson: firstname.lastname@example.org
Co-PI: Gerhard Gröbner: email@example.com
Structural studies of virus-host interactions by cryo-electron tomography on virus-infected human organoids
What questions molecular biologists can answer is highly dependent on the research methods and model systems at their disposal. In this project we aim to combine cutting-edge advances in both infection models and cryo-electron tomography to study human enteric viruses. The group of Niklas Arnberg has long experience in working with both enteroviruses and with enteric adenoviruses. The Arnberg group are currently establishing human gut organoids (“enteroids”) as a more realistic model system to study infection of the gut. On the structural biology side, a major limitation for structural analysis by cryo-EM is the sample size. The standard plunge-freezing methods used in cryo-EM can only vitrify samples to a thickness of ~1 μm. Leveraging on the extensive infrastructure at UCEM, the Carlson group have developed a high-pressure freezing-based method that would allow structural studies by cryo-electron tomography of virus-infected organoids. Combining these methods, the postdoc will be able to study host-cell remodelling by enteric viruses in situ in human organoids. This will allow visualisation of complex tissue-dependent processes, e.g. depending cell type and tissue polarity, with the unprecedented structural fidelity of cryo-electron tomography.
Lead PI: Lars-Anders Carlson: firstname.lastname@example.org
Co-PI: Niklas Arnberg: email@example.com
Mechanistic study of the autophagic protein ATG8/LC3 in membrane morphogenesis using NMR
Autophagy is a highly conserved and sophisticated “self-eating” process in eukaryotes and plays a key role in human health and disease. Formation of double- membrane autophagosomes is the key process in autophagy. The LC3 protein family (mammalian homologs of yeast ATG8) conjugated to phosphatidylethanolamine (PE) is required for autophagosomal membrane expansion and closure. However, the molecular mechanisms of these processes remain unclear. We have earlier prepared LC3-PE proteins by semisynthetic approaches and showed that LC3-PE promotes membrane fusion in vitro. The aim of this project is to gain molecular insights into how ATG8/LC3-PE mediates membrane morphogenesis. To this end we will use structural biology tools, primarily NMR, to study ATG8/LC3-PE together with lipids. NMR can provide a wealth of information about not only protein structure, but also details about lipid properties in membrane bilayers. In this way we can simultaneously investigate the effect that lipids have on the properties ATG8/LC3-PE and the effect that the protein has on membrane morphology. The work will involve both protein chemistry, and advanced NMR spectroscopy to study both protein structure, and lipid properties.
Lead PI: Lena Mäler: firstname.lastname@example.org
Co-PI: Yaowen Wu: email@example.com
Understanding assembly and function of the bacterial cell wall
Bacteria are protected from environmental insults by a peptidoglycan (PG) cell wall. Hence, the enzymes involved in the production and turnover of PG are preferred targets for many of our most successful antibiotics. However, emerging resistant bacteria are threatening the very foundations of modern infection medicine by eroding the efficacy of our antibiotic arsenal. Identifying new genetic determinants of the bacterial cell wall as antibiotic targets, and characterizing them biochemically and structurally is of highest international priority but turns out to be a very difficult task. Our team has discovered a novel Penicillin Binding Protein conserved in a number of Gram-negative pathogens (e.g. Vibrionaceae, Pseudomonadaceae, Burkholderiaceae). Preliminary data shows that it supports PG fitness under challenging environmental adaptation (e.g. low osmolarity), suggesting that it could be a new phylum-specific antimicrobial target. This research is focused on characterizing structurally and biochemically this new PBP from V. cholerae – Vc1321. It’s is a membrane protein of 1023 amino acids. The protein is likely dimeric through disulfide bridges. We have demonstrated its bifunctional transglycosylase and transpeptidase domains both in vitro and in vivo and we are now applying all sorts of genetics to understand more about its biological function and network partners.
Vc1321, renamed as PBP1V, has been cloned, expressed and purified. Characterization of the structure, kinetics, and dynamics would help to understand catalytic peculiarities and putative interaction domains with other partners. Understanding the nature and function of PBP1V might provide a new way to increase our armory of growth-affecting compounds of low or no toxicity, an unexplored ground for the development of a species-specific class of antimicrobials for clinical therapies.
Lead PI: Elisabeth Sauer-Eriksson: firstname.lastname@example.org
Co-PI: Felipe Cava: email@example.com
Green Structural Biology in cellulose and silk biotechnology
An important aspect of green chemistry and a sustainable and circular economy is to develop environmentally friendly methodology to retrieve valuable chemicals from complex biomaterials. This interdisciplinary project tackles this challenging task by exploring the molecular mechanisms underlying enzymatic processing of recalcitrant natural polymers: cellulose and silk fibers. In the project we focus on two enzymes that bring novel functionality in cellulose and silk bio-processing by softening their structure and paving the way for further biocatalytic transformation of the fibers.
We are seeking a structural biologist with a strong background in biochemistry and/or protein production with different expression organisms. The structural biology background may be in any of the areas of NMR spectroscopy, single particle cryo EM or x-ray crystallography. The project is based on novel discoveries in both the Jönsson and Wolf-Watz laboratories. The successful candidate will have the possibility to define and shape the project dependent on background and ambitions and may focus on both enzymes and/or the structures of cellulose and silk-based biomaterials.
Lead PI: Magnus Wolfl-Watz: firstname.lastname@example.org
Co-PI: Leif Jönsson: email@example.com
Multimolecular complexes providing surface stability of caveolae and direct connection sites to the endoplasmatic reticulum for fatty acid uptake
Caveolae are small invaginations of the plasma membrane involved in regulating lipid homeostasis. Patients and mice models lacking key structural components of caveolae are severely impaired in their ability to store fat. Caveolae are stabilized at the plasma membrane via assembly of specific proteins around the caveolae neck creating a narrow membrane funnel. It is currently unclear how these proteins structurally assemble at the membrane interphase of the caveolae neck to mediate stabilization of caveolae. Furthermore, based on preliminary data, we hypothesize that the role of caveolae in fatty acid uptake is conveyed by direct connection sites between caveolae and cellular organelles. The idea of this project is to; a) structurally characterize the stabilizing protein-complexes at the caveolae neck as well as connection sites to organelles in cells using correlative light and electron microscopy (CLEM) volume imaging. b) Resolve ATP-dependent kinetics and structural rearrangements in caveolae-stabilizing proteins during membrane assembly at high temporal resolution using reconstituted model systems.
Lead PI: Linda Sandblad: firstname.lastname@example.org
Co-PI: Richard Lundmark: email@example.com
Co-PI: Magnus Andersson: firstname.lastname@example.org
Structural basis of misfolded SOD1 toxicity in human motor neurons
ALS is a rapidly progressing neurodegenerative disease with no cure. Protein unfolding, misfolding and aggregation are intimately linked to the etiology of the ALS and seem to involve prion-like mechanisms of templated protein aggregation. However, the structure of misfolded protein species responsible for ALS has yet to be defined. The gene encoding the SOD1 protein was the first identified genetic cause of ALS and we have now identified a highly cytotoxic form of the misfolded SOD1 protein derived under defined conditions in vitro. The aim of this project is to resolve the structure this potentially disease-causing form of SOD1 using Cryo-EM, and also study its localization and protein interaction in cultured human patient derived motor neurons using correlated light and electron microscopy (CLEM) including tomography. This will enable the structure and activity of SOD1 protein aggregates to be understood in relation to ALS.
Lead PI: Linda Sandblad: email@example.com
Co-PI: Jonathan Gilthorpe: firstname.lastname@example.org
Co-PI: Richard Lundmark: email@example.com