Infectious hypodermal and haematopoietic necrosis virus, capsid
IHHNV_capsid is the single capsid protein of infectious hypodermal and haematopoietic necrosis virus, found particularly in shrimp densovirus. Densoviruses are a subfamily of the parvoviruses. The capsid protein has an eight-stranded anti-parallel b ...
IHHNV_capsid is the single capsid protein of infectious hypodermal and haematopoietic necrosis virus, found particularly in shrimp densovirus. Densoviruses are a subfamily of the parvoviruses. The capsid protein has an eight-stranded anti-parallel beta-barrel 'jelly roll' motif similar to that found in many icosahedral viruses, including other parvoviruses. The N-terminal portion of the IHHNV coat protein adopts a 'domain-swappe' conformation relative to its twofold-related neighbour. The loops connecting the strands of the structurally conserved jelly roll motif differ considerably in structure and length from those of other parvoviruses. IHHNV was first reported as a highly lethal disease of juvenile shrimp in 1983, and has only one type of capsid protein that lacks the phospholipase A2 activity that has been implicated as a requirement during parvoviral host cell infection. The structure of recombinant virus-like particles, composed of 60 copies of the 37.5-kDa coat protein is the smallest parvoviral capsid protein reported thus far. The small size of the PstDNV capsid protein makes the system attractive as a model for studying assembly mechanisms of icosahedral virus capsids [1].
