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American Focus > Blog > Tech and Science > Tiniest ‘ruler’ ever measures distances as small as an atom’s width
Tech and Science

Tiniest ‘ruler’ ever measures distances as small as an atom’s width

Last updated: October 11, 2024 2:14 am
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Tiniest ‘ruler’ ever measures distances as small as an atom’s width
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This fluorescent technique can precisely measure minuscule distances

Steffen J. Sahl / Max Planck Institute for Multidisciplinary Sciences

The development of an incredibly precise “ruler” has revolutionized the measurement of distances within macromolecules, allowing scientists to explore the intricate world of protein structures at an atomic level.

Proteins are essential components of living organisms, and their functions are intricately tied to their three-dimensional structures. However, deviations from the correct folding patterns can lead to malfunction and disease. Understanding the exact distances between atoms within proteins is crucial for unraveling these structural intricacies, as highlighted by Steffen Sahl from the Max Planck Institute for Multidisciplinary Sciences in Germany.

Sahl and his team embarked on a groundbreaking journey to delve inside macromolecules by harnessing the power of fluorescence. By attaching fluorescent markers to specific points on a protein molecule and utilizing laser illumination, they were able to measure distances with unprecedented accuracy based on the emitted light.

Through their innovative approach, the researchers successfully measured distances as small as 0.1 nanometres, equivalent to the width of a single atom. Moreover, the fluorescent ruler exhibited a remarkable measuring range of up to 12 nanometres, surpassing conventional methods in versatility and precision.

By applying this technique to various proteins, the team distinguished distinct structural forms and even probed minute distances within a human bone cancer cell. The method’s success can be attributed to recent technological advancements, such as enhanced microscopes and stable fluorescent molecules that ensure reliable measurements.

While lauded for its precision, experts like Jonas Ries from the University of Vienna caution that the new method may face challenges when applied to complex biological systems. As alternative techniques for measuring atomic distances continue to emerge, the utility of this innovative approach in biological research warrants further exploration.

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Looking ahead, Sahl and his colleagues are dedicated to refining their method and expanding its application to unravel the mysteries hidden within diverse macromolecules. The fluorescent ruler represents a remarkable leap forward in the quest to decipher the intricate world of protein structures, offering a glimpse into the atomic dance that underpins life itself.

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