Structure of a Spumaretrovirus Gag central domain reveals an ancient retroviral capsid

A unique spumavirus Gag N-terminal domain with functional properties of orthoretroviral matrix and capsid.

0.3 nM [U-13C; U-15N] GAG protein, 0.5 mM [U-13C; U-15N; U-2H] GAG protein, 95% H2O/5% D2O