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    • 2019-01-27 20:00:00
    • Article ID: 707068

    Novel electron microscopy offers nanoscale, damage-free tracking of isotopes in amino acids

    • Credit: Andy Sproles/Oak Ridge National Laboratory, U.S. Dept. of Energy

      Electrifying Neutrons: Monochromated electron energy loss spectroscopy in the scanning transmission electron microscope is used to distinguish between molecules that differ only by a single neutron on a single atom. The electron beam can capture changes to the minute molecular vibrations of an amino acid caused by the extra neutron without damaging the sample and with unprecedented spatial resolution.

    • Credit: Carlos Jones/Oak Ridge National Laboratory, U.S. Dept. of Energy

      Oak Ridge National Laboratory scientists used a monochromated, aberration-corrected scanning transmission electron microscope, or MAC-STEM, technique that detects the subtle changes in the weight of proteins at the nanoscale—while keeping the sample intact— is the perfect complement to a macroscale mass spectrometry experiment.

    • Credit: Carlos Jones/Oak Ridge National Laboratory, U.S. Dept. of Energy

      The interdisciplinary ORNL research team that brought damage-free isotopic labeling to the nanoscale in the electron microscope include, from left, Jacek Jakowski, Santa Jansone-Popova, Juan Carlos Idrobo, Jingsong Huang, Jong Keum, Jordan Hachtel and Ilja Popovs, all of ORNL. Not pictured, Tracy C. Lovejoy, Niklas Dellby and Ondrej L. Krivanek of Nion Co.

    OAK RIDGE, Tenn., Jan. 31, 2019—A new electron microscopy technique that detects the subtle changes in the weight of proteins at the nanoscale—while keeping the sample intact—could open a new pathway for deeper, more comprehensive studies of the basic building blocks of life. 

    Scientists at the Department of Energy’s Oak Ridge National Laboratory described in the journal Science the first use of an electron microscope to directly identify isotopes in amino acids at the nanoscale without damaging the samples.  

    Isotopes are commonly used to label molecules and proteins. By measuring the variations in the vibrational signatures of the molecule, the electron microscope can track isotopes with unprecedented spectral precision and spatial resolution. 

    The technique does not destroy the amino acids, allowing for real-space observation of dynamic chemistry and creating a foundation for a host of scientific discoveries from simple to complex biological structures across the life sciences. 

    “The way we understand the progression of diseases, human metabolism and other complicated biological phenomena is based on interactions between proteins,” said Jordan Hachtel, ORNL postdoctoral fellow and lead author. “We study these interactions by labeling specific proteins with an isotope and then tracking it through a chemical reaction to see where it went and what it did.” 

    “Now, we can track isotopic labels directly with the electron microscope, meaning we can do it with a spatial resolution comparable to the actual size of the proteins,” Hachtel added. 

    Their novel experiment, which took place at ORNL’s Center for Nanophase Materials Sciences, used monochromated electron energy-loss spectroscopy, or EELS, in a scanning transmission electron microscope, or STEM. The technique the scientists used is sensitive enough to distinguish between molecules that differ by a single neutron on a single atom. EELS was used to capture the minute vibrations in the molecular structure of an amino acid. 

    “Isotopic labels are typically seen on the macroscopic level using mass spectrometry, a scientific tool that reveals a sample’s atomic weight and isotopic composition,” said Juan Carlos Idrobo, ORNL staff scientist and corresponding author. “Mass spectrometry has incredible mass resolution, but it typically doesn’t have nanometer spatial resolution. It’s a destructive technique.” 

    A mass spectrometer uses an electron beam to break a molecule apart into charged fragments that are then characterized by their mass-to-charge ratio. Observing the sample at the macroscale, scientists can only infer statistically what chemical bonds were likely to have existed in the sample. The sample gets destroyed during the experiment, leaving valuable information undiscovered. 

    The new electron microscopy technique, as applied by the ORNL team, offers a gentler approach. By positioning the electron beam extremely close to the sample, but without directly touching it, the electrons can excite and detect the vibrations without destroying the sample, allowing observations of biological samples at room temperature over longer periods of time.

    Their result constitutes a breakthrough for electron microscopy, since the negatively charged electron beam is typically sensitive only to the protons, and not the neutrons. “However, the frequency of the molecular vibrations is dependent on the atomic weight, and the accurate measurement of these vibrational frequencies opens the first direct channel to measure isotopes in the electron microscope,” said Idrobo. 

    The ORNL-led research team expects their potentially game-changing technology would not replace but rather complement mass spectrometry and other conventional optical and neutron-based techniques currently used to detect isotopic labels. 

    “Our technique is the perfect complement to a macroscale mass spectrometry experiment,” Hachtel said. “With the pre-knowledge of the mass spectrometry, we can go in and spatially resolve where the isotopic labels are ending up in a real-space sample.” 

    Beyond the life sciences the technique could be applied to other soft matter such as polymers, and potentially in quantum materials where isotopic substitution can play a key role in controlling superconductivity. 

    Co-authors of the study titled, “Identification of Site-Specific Isotopic Labels by Vibrational Spectroscopy in the Electron Microscope,” included Jordan A. Hachtel, Jingsong Huang, Ilja Popovs, Santa Jansone-Popova, Jong K. Keum, Jacek Jakowski and Juan Carlos Idrobo all of ORNL, and Tracy C. Lovejoy, Niklas Dellby and Ondrej L. Krivanek of Nion Co., the designers and manufacturers of the electron microscope and spectrometer used in the experiments.  

    The research was supported by DOE’s Office of Science and used a monochromated, aberration-corrected scanning transmission electron microscope, or MAC-STEM, and other resources at ORNL’s Center for Nanophase Materials Sciences, a DOE User Facility.  

    UT-Battelle manages ORNL for DOE’s Office of Science. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit science.energy.gov

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