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Home Biological Science & Technology

 Nanobodies potently neutralize SARS-CoV-2 variants

by Nano Digest
March 29, 2022
in Biological Science & Technology
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Nanobodies potently neutralize SARS. Anti bodies Nanobodis viral spike SARS-Cov-22

Fu2 nanobody (pink) bound to the viral spike. Credit: Hrishikesh Das and Martin Hällberg.

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With the help of advanced laboratory techniques, we were able to identify a panel of nanobodies that very effectively Nanobodies potently neutralize SARS-CoV-2,” says Gerald McInerney, professor at the Department of Microbiology, Tumor and Cell Biology (MTC), Karolinska Institutet, and joint senior author of both studies.

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From left: Leo Hanke, Ben Murrell and Gerald McInerney. Photo: Siwen Long.

Despite the roll-out of vaccines and antivirals, the need for effective therapeutics against severe COVID-19 or (SARS-Cov-2) infection remains high. Nanobodies—which are fragments of antibodies that occur naturally in camelids and can be adapted for humans—are promising therapeutic candidates as they offer several advantages over conventional antibodies. For example, they have favourable biochemical properties and are easy to produce cost-effectively at scale.

In the now published studies, the labs of Gerald McInerney and Ben Murrell, also at MTC, identify several potent nanobodies derived from an alpaca immunised with SARS-CoV-2 antigens.

Reduced viral load

The first report in Nature Communications describes a single nanobody, Fu2 (named after the alpaca Funny), that significantly reduced the viral load of SARS-CoV-2 in cell cultures and mice. Using electron cryo-microscopy, the researchers found that Fu2 naturally binds to two separate sites on the viral spike, thus inhibiting the virus’ ability to enter the host cell. This part of the study was conducted in collaboration with Hrishikesh Das and Martin Hällberg at the Department of Cell and Molecular Biology at Karolinska Institutet.

The researchers next delved deeper into the alpaca’s nanobody repertoire by combining a range of advanced laboratory techniques and computational methods, resulting in a library of nanobodies described in detail.

The results, presented in Science Advances, revealed additional nanobodies that in cell cultures and mice effectively cross-neutralized both the founder and beta variant of SARS-CoV-2 and even neutralized potently neutralize Nanobodies of SARS-CoV-2.

Promising therapeutic candidates

“These nanobodies represent promising therapeutic candidates against several SARS-CoV-2 variants,” says first author Leo Hanke, a postdoctoral researcher who established the nanobody technology in the McInerney group.

The researchers are currently applying the same techniques to identify which nanobodies from this set are best able to neutralize Omicron, the now dominating SARS-CoV-2 variant.

“Once established, these libraries can be expanded and mined for nanobodies that neutralize new emerging variants,” says Assistant Professor Ben Murrell, also joint senior author of both studies.

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