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A new understanding of protein movement

Engineers uncover role of surface diffusion in protein transport, which could aid biopharmaceutical processing

Date:
July 7, 2020
Source:
University of Delaware
Summary:
A team of engineers has uncovered the role of surface diffusion in protein transport, which could aid biopharmaceutical processing. This work will lead to the creation of new ways to reduce waste during the expensive drug manufacturing process, enabling more efficient ways of designing and developing manufacturing techniques.
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Many of the most promising medicines under development are proteins, often antibodies, to help patients fight disease. These proteins must be purified as part of the manufacturing process -- a task that can be tricky and result in costly waste.

Scientists have struggled to directly measure the movement of proteins, known as protein diffusion, in materials that include both solid and liquid components. They have also disagreed on how movement at the surface of the material contributes to protein movement when using ion-exchange chromatography, a laboratory and manufacturing method for separating materials based on their charge. Proteins can creep into the pores of resin beads used to perform ion-exchange chromatography and bind on the walls, based on charge.

Now, a team of engineers from the University of Delaware, with a collaborator from pharmaceutical company Amgen, has shown that surface diffusion in protein transport into ion-exchange beads depends on adsorption affinity -- a measure of attraction between the two materials. By exploiting this relationship, the team developed a procedure to purify a monoclonal antibody -- a type of molecule that mediates immunity -- with productivity 43% higher than usual.

The team's results were published in the Proceedings of the National Academy of Sciences in March. The paper's authors include Ohnmar Khanal, a doctoral student in chemical engineering; Vijesh Kumar, postdoctoral fellow in chemical engineering; Fabrice Schlegel, a principal engineer at Amgen; and Abraham Lenhoff, Allan P. Colburn Professor of Chemical Engineering.

"We present a very strong case for the significance of surface diffusion, and we use multiple approaches to corroborate its importance through a simple technique that can be implemented right away," said Khanal.

The team used chromatography, mechanistic modeling, confocal microscopy and small-angle neutron scattering. The latter was performed at the National Center for Neutron Research at the National Institute for Standards and Technology.

By understanding and exploiting protein surface diffusion in ion-exchange chromatography, researchers can build upon this work and develop methods to reduce waste during the expensive drug manufacturing process.

"Ion-exchange chromatography of proteins is an absolutely key operation in biopharmaceutical manufacturing," said Lenhoff.

Kumar and Lenhoff are now working on a separate project funded by the National Institute for Innovation in Biopharmaceutical Manufacturing, based at the University of Delaware, to develop mathematical models of chromatography, which could enable more efficient ways of designing and developing manufacturing processes.

Researchers can also build upon this new fundamental understanding of protein diffusion and perhaps apply it to other problems. Protein diffusion on surfaces is an important phenomenon inside the body, too. Movement and fibrillation of amyloid-ß in the brain has been associated with neurogenerative diseases, for example, and protein surface diffusion can affect the performance of biosensors.

"This is an example of how fundamental research can lead to practical applications and significant improvements in those practical applications," said Lenhoff.

And it all started with a brainstorm, where Khanal suggested more in-depth investigation of surface diffusion's relationship to binding affinity on the charged surfaces using complementary tools.

"When we started this, we never thought we would go this far," said Kumar. "It started as a very small idea."


Story Source:

Materials provided by University of Delaware. Original written by Julie Stewart. Note: Content may be edited for style and length.


Journal Reference:

  1. Ohnmar Khanal, Vijesh Kumar, Fabrice Schlegel, Abraham M. Lenhoff. Estimating and leveraging protein diffusion on ion-exchange resin surfaces. Proceedings of the National Academy of Sciences, 2020; 117 (13): 7004 DOI: 10.1073/pnas.1921499117

Cite This Page:

University of Delaware. "A new understanding of protein movement." ScienceDaily. ScienceDaily, 7 July 2020. <www.sciencedaily.com/releases/2020/07/200707120648.htm>.
University of Delaware. (2020, July 7). A new understanding of protein movement. ScienceDaily. Retrieved March 28, 2024 from www.sciencedaily.com/releases/2020/07/200707120648.htm
University of Delaware. "A new understanding of protein movement." ScienceDaily. www.sciencedaily.com/releases/2020/07/200707120648.htm (accessed March 28, 2024).

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