New research led by scientists at La Jolla Institute for Immunology (LJI) reveals the workings of a human antibody called mAb 3A6, which may prove to be an important component for Ebola virus therapeutics.
This antibody was isolated from blood samples from an Ebola survivor treated at Emory University Hospital during the 2014-2016 Ebola virus outbreak, an outbreak that began in West Africa and killed more than 11,300 people.
In their new study, the researchers showed that mAb 3A6 helps block infection by binding to an important part of Ebola’s viral structure, called the “stalk.” Study collaborators at the NIH’s National Institute of Allergy and Infectious Diseases (NIAID) found that treatment with mAb 3A6 can benefit non-human primates in advanced stages of Ebola virus disease.
“This antibody offers the best protection in primates, at the lowest dose yet seen for any single antibody,” says LJI Professor, President & CEO Erica Ollmann Saphire, Ph.D., MBA, who led the recent Nature Communications study alongside John A. G. Briggs, Ph.D., of Cambridge University and the Max Planck Institute of Biochemistry; Gabriella Worwa, D.V.M., and Jens H. Kuhn, M.D., Ph.D., of NIAID; and Carl W. Davis, Ph.D., and Rafi Ahmed, Ph.D., of the Emory Vaccine Center.
The discovery that mAb 3A6 appears effective at a very low dose is also exciting. “The lower the amount of an antibody you can deliver to someone, the easier it will be to manufacture a treatment-and the lower the cost,” says study first author Kathryn Hastie, Ph.D., LJI Instructor and Director of LJI’s Center for Antibody Discovery.
How the antibody works
The key to treating Ebola virus is to find antibodies that anchor tightly to and block essential machinery of the virus. The researchers zeroed in on mAb 3A6 because it appears to target a structure on Ebola virus called the “stalk.” The stalk is an important part of the Ebola virus structure because it anchors Ebola’s glycoprotein structure (which drives entry into a host cell) to Ebola’s viral membrane.
The team spearheaded efforts to capture images of mAb 3A6 in action. The researchers used two imaging techniques, called cryoelectron tomography and x-ray crystallography, to show how mAb 3A6 binds to Ebola virus to interrupt the infection process.
The researchers found that mAb 3A6 binds to a site normally concealed by a shifting landscape of viral proteins. “There’s a dynamic movement in these proteins,” says Hastie. “They might kind of wiggle around, move back and forth, maybe lean over a little bit or go up and down.”
Antibody mAb 3A6 takes advantage of this little protein dance. It has such a strong affinity for its viral target that it can slip between the proteins, lift them up, and latch on its target.
Hastie says mAb 3A6’s ability to bind to this target is important for several reasons. First, the site is conserved across different species of Ebola virus, making antibodies that target this region an attractive component in “pan-Ebolavirus” therapeutics. Second, the new understanding of how mAb 3A6 “lifts up” proteins in the viral stalk gives scientists a clearer view of Ebola’s weaknesses. MAb 3A6 also shows us how similar antibodies against the stalks of other viruses might work as well.
This study gives us some hints for how to design vaccines that are specifically against this region of Ebola virus.”
Kathryn Hastie, Ph.D., LJI Instructor and Director of LJI’s Center for Antibody Discovery
Additional authors of the study, “Anti-Ebola virus mAb 3A6 protects highly viremic animals from fatal outcome via binding GP(1,2) in a position elevated from the virion membrane,” include Zhe “Jen” Li Salie, who solved the X-ray structure; Zunlong Ke, who performed the cryoelectron tomography; Lisa Evans DeWald, Sara McArdle, Ariadna Grinyó, Edgar Davidson, Sharon L. Schendel, Chitra Hariharan, Michael J. Norris, Xiaoying Yu, Chakravarthy Chennareddy, Xiaoli Xiong, Megan Heinrich, Michael R. Holbrook, Benjamin Doranz, Ian Crozier, Yoshihiro Kawaoka, Luis M. Branco, Jens H. Kuhn
This study was supported in part by the National Institute of Health’s National Institute for Allergy and Infectious Diseases (grant U19 AI142790, Contract No. HHSN272201400058C, Contract No. HHSN272200700016I, Contract No. HHSN272201800013C), DARPA (contract W31P4Q-14-1-0010), and UK Medical Research Council (grant MC_UP_1201/16), the European Research Council (ERC-CoG-648432 MEMBRANEFUSION), and the Max Planck Society.
Hastie, K. M., et al. (2025). Anti-Ebola virus mAb 3A6 protects highly viremic animals from fatal outcome via binding GP(1,2) in a position elevated from the virion membrane. Nature Communications. doi.org/10.1038/s41467-025-56452-2.
News
New human antibody shows promise for Ebola virus treatment
New research led by scientists at La Jolla Institute for Immunology (LJI) reveals the workings of a human antibody called mAb 3A6, which may prove to be an important component for Ebola virus therapeutics. [...]
Early Alzheimer’s Detection Test – Years Before Symptoms Appear
A new biomarker test can detect early-stage tau protein clumping up to a decade before it appears on brain scans, improving early Alzheimer’s diagnosis. Unlike amyloid-beta, tau neurofibrillary tangles are directly linked to cognitive decline. Years [...]
New mpox variant can spread rapidly across borders
International researchers, including from DTU National Food Institute, warn that the ongoing mpox outbreak in the Democratic Republic of the Congo (DRC) has the potential to spread across borders more rapidly. The mpox virus [...]
How far would you trust AI to make important decisions?
From tailored Netflix recommendations to personalized Facebook feeds, artificial intelligence (AI) adeptly serves content that matches our preferences and past behaviors. But while a restaurant tip or two is handy, how comfortable would you [...]
Can AI Really Think? Research Reveals Gaps in Logical Execution
While AI models can break down problems into structured steps, new research reveals they still fail at basic arithmetic and fact-checking—raising questions about their true reasoning abilities. Large Language Models (LLMs) have become indispensable [...]
Scientists Just Made Cancer Radiation Therapy Smarter, Safer, and More Precise
Scientists at UC San Francisco have developed a revolutionary cancer treatment that precisely targets tumors with radiation while sparing healthy tissues. By using a KRAS-targeting drug to mark cancer cells and attaching a radioactive [...]
Superbugs Are Losing to Science, Light, and a Little Spice
Texas A&M researchers have found that curcumin, when activated by light, can weaken antibiotic-resistant bacteria, restoring the effectiveness of conventional antibiotics. Curcumin: A Surprising Ally Against Superbugs In 2017, a woman admitted to a [...]
New Research Shatters the Perfect Pitch Myth
For decades, people believed absolute pitch was an exclusive ability granted only to those with the right genetics or early music training. But new research from the University of Surrey proves otherwise. It’s been [...]
Why Some Drinkers Suffer Devastating Liver Damage While Others Don’t
A study from Keck Medicine of USC found that heavy drinkers with diabetes, high blood pressure, or a large waistline are up to 2.4 times more likely to develop advanced liver disease. These conditions may amplify [...]
“Good” Cholesterol Could Be Bad for Your Eyes – New Study Raises Concerns
‘Good’ cholesterol may be linked to an increased risk of glaucoma in individuals over 55, while, paradoxically, ‘bad’ cholesterol may be associated with a lower risk. These findings challenge conventional beliefs about factors that [...]
Reawakening Dormant Nerve Cells: Groundbreaking Neurotechnology Restores Motor Function
A new electrical stimulation therapy for spinal muscle atrophy (SMA) has shown promise in reactivating motor neurons and improving movement. In a pilot clinical trial, three patients who received spinal cord stimulation for one [...]
AI’s Energy Crisis Solved? A Revolutionary Magnetic Chip Could Change Everything
AI is evolving at an incredible pace, but its growing energy demands pose a major challenge. Enter spintronic devices—new technology that mimics the brain’s efficiency by integrating memory and processing. Scientists in Japan have [...]
Nanotechnology for oil spill response and cleanup in coastal regions
(Nanowerk News) Cleaning up after a major oil spill is a long, expensive process, and the damage to a coastal region’s ecosystem can be significant. This is especially true for the world’s Arctic region, [...]
The Role of Nanotechnology in Space Exploration
Nanotechnology, which involves working with materials at the atomic or molecular level, is becoming increasingly important in space exploration. By improving strength, thermal stability, electrical conductivity, and radiation resistance, nanotechnology is helping create lighter, more [...]
New Study Challenges Beliefs About CBD in Pregnancy, Reveals Unexpected Risks
CBD is gaining popularity as a remedy for pregnancy symptoms like nausea and anxiety, but new research suggests it may not be as safe as many believe. A study from McMaster University found that [...]
Does COVID increase the risk of Alzheimer’s disease?
Scientists discover that even mild COVID-19 can alter brain proteins linked to Alzheimer’s disease, potentially increasing dementia risk—raising urgent public health concerns. A recent study published in the journal Nature Medicine investigated whether both mild and [...]
