Inositol hexakisphosphate fits into the pore structures (pink) of the HIV capsid (teal), and makes the makes the capsid stronger, protecting the genetic material inside. Photo: UNSW

Scientists from the University of New South Wales (UNSW) and the UK have discovered that the human immunodeficiency virus (HIV) hijacks a small molecule from the host cell to protect itself from being destroyed by the host's immune system.

The finding, as well as details of the new strategy that enabled it, are published as back-to-back papers in eLife.

The findings identify a new target for antiviral therapy against HIV and provide a method for testing and measuring new drugs designed to target the capsid.

Chantal Márquez, Ph.D. student from UNSW, is involved in both studies and is the first author of the paper describing the new method.

HIV forms a protein shell, called a capsid, that shields its genetic material from host defence mechanisms as it enters the cell and makes its way to the nucleus to establish infection.

Using a new single-molecule microscopy technique, developed at UNSW's Single Molecule Science in the Faculty of Medicine, the research teams found that HIV specifically incorporates a small molecule from the host cell (inositol hexakisphosphate) to strengthen its capsid.

The host inadvertently provides the key for the virus infecting it to lock down the protective shell, keeping the genetic cargo safe until it is released into the nucleus.

"The HIV capsid falls apart within minutes once it's isolated from the virus," Till Böcking, associated professor who led the UNSW team involved in both studies, said. "Our strategy lets us study exactly how a native capsid breaks apart in real-time without taking it out of the viral membrane."

With the help of Stuart Turville, associate professor of the Kirby Institute, the team engineered viruses with fluorescent tags to monitor the viral capsid using fluorescence microscopy.

"We can now see the effect of different molecules on the capsid, and pinpoint precisely when it cracks open and begins to collapse," Böcking said.

"Capsids need to be much more stable inside a cell because the infection process takes hours, not minutes. So we wanted to find out what keeps it stable inside a cell," David Jacques of Single Molecule Science, who is an author of both studies, said.

The researchers found that inositol hexakisphosphate, which is abundantly present inside mammalian cells, makes the capsid much stronger, stabilizing it for 10 to 20 hours.

"It's like a switch. When you bind this molecule, you stabilize the capsid, and release the molecule to open it up," Böcking said.

"The HIV capsid has been intensively studied, but the question of how it can simultaneously be both stable and poised to 'uncoat' has been one of the great unanswered questions in HIV biology," Leo James, leader of the research team at the Medical Research Council Laboratory of Molecular Biology in Cambridge, said.

Most of the currently approved HIV therapies target enzymes needed at different stages of the virus' life cycle, but none of them are directed at the HIV capsid.

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