First serial crystallography experiments performed at BioMAX

BioMAX has successfully performed the first serial crystallography experiments at the beamline. This new method is performed at room temperature which allows structural biologists to study their molecules at more biologically relevant conditions. The technique can also be used on smaller crystals which will alleviate some of the restrictions for molecules such as membrane proteins, that do not typically form large crystals. Eventually, it is hoped that this technique will allow users at the BioMAX and MicroMAX beamlines to take snapshots of the dynamic states of proteins in rapid succession giving a dynamic view of protein movement and activity.

The serial crystallography technique promises to be very useful to users of both synchrotrons and XFELs. Over the course of one experiment, users were able to measure between 20 and 50 crystals every second, resulting in 20 TB of data from just 3 proteins. BioMAX hopes to quickly master this complex technique in order to offer it to users as soon as possible. It also gives us a glimpse of what will be possible at the newly funded MicroMAX beamline.

>Read more on the MAX IV Laboratory website

Image: BioMAX serial crystallography setup using a High Viscosity Extrusion (HVE) injector specially designed for the BioMAX endstation by Bruce Doak of the Max Planck Institute for Medical Research, Heidelberg, and fabricated at that institute.

Biological light sensor filmed in action

Film shows one of the fastest processes in biology

Using X-ray laser technology, a team led by researchers of the Paul Scherrer Institute PSI has recorded one of the fastest processes in biology. In doing so, they produced a molecular movie that reveals how the light sensor retinal is activated in a protein molecule. Such reactions occur in numerous organisms that use the information or energy content of light – they enable certain bacteria to produce energy through photosynthesis, initiate the process of vision in humans and animals, and regulate adaptations to the circadian rhythm. The movie shows for the first time how a protein efficiently controls the reaction of the embedded light sensor. The images, now published in the journal Science, were captured at the free-electron X-ray laser LCLS at Stanford University in California. Further investigations are planned at SwissFEL, the new free-electron X-ray laser at PSI. Besides the scientists from Switzerland, researchers from Japan, the USA, Germany, Israel, and Sweden took part in this study.

>Read more on the SwissFEL at Paul Scherrer Institute website

Image: Jörg Standfuss at the injector with which protein crystals for the experiments at the Californian X-ray laser LCLS were tested. In the near future, this technology will also be available at PSI’s X-ray laser SwissFEL, for scientists from all over the world.
Credit: Paul Scherrer Institute/Mahir DzaAmbegovic

X-ray laser opens new view on Alzheimer proteins

Graphene enables structural analysis of naturally occurring amyloids

A new experimental method permits the X-ray analysis of amyloids, a class of large, filamentous biomolecules which are an important hallmark of diseases such as Alzheimer’s and Parkinson’s. An international team of researchers headed by DESY scientists has used a powerful X-ray laser to gain insights into the structure of different amyloid samples. The X-ray scattering from amyloid fibrils give patterns somewhat similar to those obtained by Rosalind Franklin from DNA in 1952, which led to the discovery of the well-known structure, the double helix. The X-ray laser, trillions of times more intense than Franklin’s X-ray tube, opens up the ability to examine individual amyloid fibrils, the constituents of amyloid filaments. With such powerful X-ray beams any extraneous material can overwhelm the signal from the invisibly small fibril sample. Ultrathin carbon film – graphene – solved this problem to allow extremely sensitive patterns to be recorded. This marks an important step towards studying individual molecules using X-ray lasers, a goal that structural biologists have long been pursuing. The scientists present their new technique in the journal Nature Communications.

Amyloids are long, ordered strands of proteins which consist of thousands of identical subunits. While amyloids are believed to play a major role in the development of neurodegenerative diseases, recently more and more functional amyloid forms have been identified. “The ‘feel-good hormone’ endorphin, for example, can form amyloid fibrils in the pituitary gland. They dissolve into individual molecules when the acidity of their surroundings changes, after which these molecules can fulfil their purpose in the body,” explains DESY’s Carolin Seuring, a scientist at the Center for Free-Electron Laser Science (CFEL) and the principal author of the paper. “Other amyloid proteins, such as those found in post-mortem brains of patients suffering from Alzheimer’s, accumulate as amyloid fibrils in the brain, and cannot be broken down and therefore impair brain function in the long term.”

Image: On the ultra-thin, extremely regular layer of graphene, the fibrils align themselves in parallel in large domains. The intense X-ray light from the X-rax free-electron laser LCLS at the SLAC National Accelerator Center enabled the researchers to gain partial information about the fibril structure from ensembles of just a few fibrils.
Credit: Greg Stewart/SLAC National Accelerator Laboratory

Climate change and its effects on Rocky Mountain alpine lakes

Alpine lakes in the Rocky Mountains are important biological hot spots of that ecosystem. These lakes do not have enough nutrients to support large amounts of aquatic life because of the cold climate in the surrounding watershed. Rather, the lakes are home to oligotrophs, organisms that grow slowly and can survive in harsh aquatic environments. The lakes also host a variety of cold-water fish, such as trout, that are preyed upon by birds, including osprey and bald eagles.

Researchers from University of Wyoming, U.S. Geological Survey, and the Canadian Light Source conducted experiments at the CLS on the fine dust that is deposited to the Rocky Mountains to learn more about how the alpine lakes could be affected by climate change. They looked specifically at phosphorus in dust and how it is made available to the organisms in the cold lakes and streams, because phosphorus is one of the major limiting nutrients, and its availability could affect the functions and properties of alpine lake ecosystems.

>Read more on the Canadian Light Source website

 

Investigation of metal deposition in organs after joint replacement

Synchrotron analysis shows potentially harmful metals from implants can find their way into human organs.

The hip replacement is considered to be one of the most successful orthopaedic interventions, with 75,000 performed each year by the NHS alone. However, the implants used to replace hips contain metals, such as chromium and cobalt, which are potentially toxic and which can be deposited into tissues around the implant site due to wear and corrosion. A team of researchers used X-ray absorption spectroscopy (XAS) on the I18 beamline to show that these metals can also find their way into organ tissues. Their results suggest that chronic diseases, such as diabetes, may create conditions in which mildly toxic trivalent chromium (CrIII) particles from replacement joints are reoxidised within the body to form carcinogenic hexavalent chromium (CrVI). Their results have been published in the Journal of Trace Elements in Medicine and Biology.

>Read more on the Diamond Light Source website

Image: Overview of the study (entire figure to see here).

What makes pollen walls the most durable biological material?

Sporopollenin is the most durable biological material in nature and is a major component of the outer wall of pollen.

Scientists at the Natural History Museum (UK) and the ESRF are investigating the structure of the pollen wall this past weekend, on ID16A, to find out why this material is so resistant.

This experiment would not have taken place if chance, luck, but mostly curiosity had not played a major role in this story. ESRF post-doctoral researcher Ruxandra Cojocaru was talking to colleagues at the facility, looking for an appropriate material for a sedimentation study. Many discussions later, she ended up finding what she needed at the Natural History Museum in London, where curator and pollen specialist Stephen Stukins works.

Several exchanges later, and with an approved proposal for a different project than the original, they are now on ID16A to study the structure of pollen at nanolevel. “Throughout time, there have been species that have disappeared, yet the major plant groups have been relatively resistant to extinction. This may be due to the resistant sporopollenin material that was adapted for plant survival on land, especially exposure to UV radiation”, explains Stukins. With fellow NHM microfossil curator Giles Miller, he has brought fossil samples of Bathonian age, from the Jurassic era, that are part of the museum collection. “What we want to see is the structure of pollen, and more precisely of the sporopollenin outer wall. This is an almost inert biological polymer and we think it is key to the properties of pollen”, says Stukins.

>Read more on the European Synchrotron website

Image: the sample in its set-up at the European Synchrotron.
Credit: Montserrat Capellas Espuny

Supporting World Cancer Day 2018

Diamond is proud to be supporting World Cancer Day and highlighting our role, working with our user community, in pioneering synchrotron research in every area of cancer – from developing a better understanding of how cancer cells work to delivering new cancer therapies.
Despite major advances in diagnosis and treatment, cancer still claims the lives of 8.8 million people every year around the world. About 4 million of these die prematurely (under the age of 70). World Cancer Day aims to raise the awareness of cancer and its treatment around the world. With the tagline ‘We can. I can.’, World Cancer Day is exploring how everyone can play their part in reducing the global burden of cancer.

Diamond has published over 900 publications in the last 12 months, with around 10% of these focusing on cancer. The wide-ranging research currently covers at least 12 cancer types, with many more general studies on the structure of cancer cells and pathways, potential drug targets and possible drug candidates. Building on last year’s review of some of the key studies in cancer that have taken place at Diamond, here is an update on studies that have been published in the last 12 months.

>Read more on the Diamond Light Source website

 

Modified antibody clarifies tumor-killing mechanisms

The structure of an antibody was modified to selectively activate a specific pathway of the immune system, demonstrating its value in killing tumor cells.

Immunotherapy—the use of the immune system to fight disease—has made tremendous progress in the fight against cancer. Antibodies such as immunoglobulin G (IgG) can identify and attack foreign or abnormal substances, including tumor cells. But to control and amplify this response, scientists need to know more about how elements of the immune system recognize tumor cells and trigger their destruction. There are two main pathways for this: antibody-dependent mechanisms and complement-dependent mechanisms.

The antibody pathway involves coating the surfaces of tumor cells with antibodies that recruit “natural killer” (NK) cells and macrophages (a type of white blood cell) to destroy the tumor cells. The complement pathway (so named because it complements the antibody pathway) also engages NK cells and macrophages and includes a third mechanism—a cascade of events culminating in tumor-cell destruction via a membrane attack complex (MAC).

>Read more on the ALS webpage

Image: extract of a schematic illustration (see on the ALS webpage)

Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how important bioinorganic electron transfer systems operate. Using a combination of very different, time-resolved measurement methods at DESY’s X-ray source PETRA III and other facilities, the scientists were able to show that so-called pre-distorted states can speed up photochemical reactions or make them possible in the first place. The group headed by Sonja Herres-Pawlis from the RWTH Aachen University  Michael Rübhausen from the University of Hamburg and Wolfgang Zinth from Munich’s Ludwig Maximilian University, is presenting its findings in the journal Nature Chemistry.

The scientists had studied the pre-distorted, “entatic” state using a model system. An entatic state is the term used by chemists to refer to the configuration of a molecule in which the normal arrangement of the atoms is modified by external binding partners such that the energy threshold for the desired reaction is lowered, resulting in a higher speed of reaction. One example of this is the metalloprotein plastocyanin, which has a copper atom at its centre and is responsible for important steps in the transfer of electrons during photosynthesis. Depending on its oxidation state, the copper atom either prefers a planar configuration, in which all the surrounding atoms are arranged in the same plane (planar geometry), or a tetrahedral arrangement of the neighbouring ligands. However the binding partner in the protein forces the copper atom to adopt a sort of intermediate arrangement. This highly distorted tetrahedron allows a very rapid shift between the two oxidation states of the copper atom.

>Read more on the PETRA III website

Image Caption: Entatic state model complexes optimize the energies of starting and final configuration to enable fast reaction rates (illustrated by the hilly ground). The work demonstrates that the entatic state principle can be used to tune the photochemistry of copper complexes.
Credit: RWTH Aachen, Sonja Herres-Pawlis

SXRF shows anthers have a craving for copper

Research links micronutrient copper with pollen fertility and seed/grain yield

The global demand for high-yield crops is increasing with growing population and decreasing farmland resources. These trends force the utilization of marginal lands for agricultural purposes. The bioavailability of essential mineral nutrients such as copper in these soils is often low, causing the reduced crop growth and fertility, and consequently low grain yield or even total crop failure. Although copper is recognized as an essential micronutrient for plant fertility, scientists still do not completely know which reproductive structures of plants require copper, how copper is delivered there and how copper transport processes are regulated. These questions are currently being addressed in the Vatamaniuk lab using model plants Arabidopsis thaliana and Brachypodium distachyon as well as a crop species, wheat, Triticum aestivum.

In studies using A. thaliana, the Vatamaniuk research group identified a new protein, CITF1, whose transcript accumulates in A. thaliana flowers during periods of copper deficiency. CITF1 acts as a transcription regulator: it regulates copper uptake into the roots and its delivery to flowers, working in tandem with SPL7 that is the central regulator of copper homeostasis in this plant species. When SPL7 and CITF1 do not function, as in the citf1 spl7 double mutant, its seedlings die and its pollen becomes infertile. Working with CHESS scientist, Rong Huang, at F3 beamline, a member of the Vatamaniuk research group, Ju-Chen Chia has shown that the sites of pollen production, anthers of flowers, accumulate the majority of the absorbed copper in A. thaliana. Huang and Chia also showed that copper accumulation was somewhat lower in anthers and carpels of the citf1 mutant and was further reduced in anthers and carpels of the spl7 mutant compared to wild-type plants (Fig. 1). They also showed that the majority of anthers of the citf1 spl7 double mutant lacked copper and that this deficiency resulted in pollen infertility.

>Read more on the CHESS website

Hijacker parasite blocked from infiltrating blood

A major international collaboration led by Melbourne researchers has discovered that the world’s most widespread malaria parasite infects humans by hijacking a protein the body cannot live without.

The researchers were then able to successfully develop antibodies that disabled the parasite from carrying out this activity.
The study, led by the Walter and Eliza Hall Institute’s Associate Professor Wai-Hong Tham and Dr Jakub Gruszczyk, found that the deadly malaria parasite Plasmodium vivax (P. vivax) causes infection through latching onto the human transferrin receptor protein, which is crucial for iron delivery into the body’s young red blood cells.

Published today in Science, the discovery has solved a mystery that researchers have been grappling with for decades.
The MX and SAXS beamline staff at the Australian Synchrotron assisted with data collection.

Associate Professor Tham, who is also a HHMI-Wellcome International Research Scholar, said the collective efforts of teams from Australia, New Zealand, Singapore, Thailand, United Kingdom, United States, Brazil and Germany had brought the world closer to a potential effective vaccine against P.vivax malaria.

>Read more on the Australian Synchrotron website

 

Malaria in Action

Seeing the invisible

In 2007 Helen Saibil was at a conference in Australia. Amongst the presentations there happened to be talks on the parasites malaria and toxoplasma and how they infect mammalian cells, causing disease. Helen is a structural biologist and whilst listening she began to realise that her newly acquired skills -she was doing electron tomography of cells- might allow the researchers to see things they had never seen before.

Electron tomography reveals structures in the interiors of cells in great detail. What she hoped was that it could be used to look at the malaria parasites inside red blood cells [See images below] to get a better understanding of what they do there. Helen approached one of the speakers, Mike Blackman, then at the National Institute for Medical Research at Mill Hill in London, and so began a thriving collaboration. One that has produced the remarkable pictures of malaria parasites breaking out of infected human red blood cells on this page.

Helen Saibil and her colleagues used electron tomography to peer into malaria infected cells, looking at the parasites hiding and multiplying inside. The technique produces exquisitely detailed pictures able to reveal very tiny features, but it has one big drawback. Electrons cannot penetrate deep into the sample so it only works on very thinly sliced samples, much thinner than an individual cell. As a result it cannot be used to look at entire cells, or in this case red blood cells containing malaria parasites.

>Read more on the Diamond Light Source website

 

Synchrotron sheds light on the amphibious lifestyle of a new raptorial dinosaur

An exceptionally well-preserved dinosaur skeleton from Mongolia at ESRF.

The skeleton unites an unexpected combination of features that defines a new group of semi-aquatic predators related to Velociraptor. Detailed 3D synchrotron analysis allowed an international team of researchers to present the bizarre 75 million-year-old predator, named Halszkaraptor escuilliei, in Nature.

The study not only describes a new genus and species of bird-like dinosaur that lived during the Campanian stage of the Cretaceous in Mongolia but also sheds light on an unexpected amphibious lifestyle for raptorial dinosaurs.

>Read more on the ESRF website

Image: The team of scientists at ESRF’s BM05 beamline during the set up of Halszkaraptor escuilliei fossil. From left to right: Pascal Godefroit, Vincent Beyrand, Dennis Voeten, Paul Tafforeau, Vincent Fernandez, Andrea Cau.
Credit: ESRF/P.Jayet

 

 

Combined imaging approach characterises plaques associated with Alzheimer’s disease

Australian Synchrotron X-ray and infrared imaging techniques have been used in a powerful combined approach to characterise the composition of amyloid plaques that are associated with Alzheimer’s disease.

Alzheimer’s disease is major international health problem that accounts for 50-75 per cent of all cases of dementia in Australia. More than 400,000 Australians are living with dementia and it is the second leading cause of death.

Amyloid plaques are complex protein fragments which accumulate between nerve cells in the brain and may destroy connections between them, and are hallmarks of Alzheimer’s disease.

“However, it is still not known if the plaques cause Alzheimer’s or whether the Alzheimer’s causes their formation, which is why we need to improve our understanding of protein structures within plaques, and the molecular and elemental composition of tissue surrounding the plaques“ said Dr Mark Hackett of Curtin University, who led the research.

The study was published earlier in the year in Biochemistry.

As very few methods provide sufficient chemical information to study the composition and distribution of the plaques in excised tissue, the investigators decided to combine Synchrotron spectroscopic techniques with additional imaging methods, Raman spectroscopy and fluorescence microscopy.

>Read more on the Australian synchrotron website

Image Caption: Histology, FTIR, XFM, and tissue autofluorescence imaging of Aβ-plaques

2017 ANSTO, Australian Synchrotron Stephen Wilkins Medal awarded

Leonie van ‘t Hag has been awarded the Australian Synchrotron S. Wilkins Medal for her PhD thesis

The award recognises her research to improve the method to crystallise proteins and peptides in order to study their structure, using a technique called crystallography. “Leonie’s insights into crystallisation processes could significantly help the development of treatments for a variety of illnesses,” said Australian Synchrotron Director, Professor Andrew Peele.

Most solid material in the world is made of crystalline structures. Crystals are made up of rows and rows of atoms or molecules stacked up like boxes in a warehouse, in different arrangements.

The science of determining these atomic or molecular structures from crystalline materials is called crystallography.

A mixtape for drug discovery

New method enables automated fast investigation of enzymatic processes

Scientists at DESY have developed a new method that enables automated and fast screening of promising drug candidates. This novel technique, called mix-and-diffuse serial synchrotron crystallography, can image the interaction of potential drug targets with drug candidates or other molecules. The concept has the potential to take structure and fragment based drug design to a new level, as the researchers write in the Journal of the International Union of Crystallography (IUCrJ).

>Read More on the PETRA III website

Image: Principle of the mix-and-diffuse serial synchrotron crystallography: protein crystals are mixed with a solution of a drug candidate and X-rayed on a tape running through the X-ray beam.
Credit: Beyerlein et al., IUCrJ