Role of arginine-56 within the structural protein VP3 of foot-and-mouth disease virus (FMDV) O1 Campos in virus virulence.
FMDV O1 subtype undergoes antigenic variation under diverse growth conditions. Of particular interest is the amino acid variation observed at position 56 within the structural protein VP3. Selective pressures influence whether histidine (H) or arginine (R) is present at this position, ultimately influencing in vitro plaque morphology and in vivo pathogenesis in cattle. Using reverse genetics techniques, we have constructed FMDV type O1 Campos variants differing only at VP3 position 56, possessing either an H or R (O1Ca-VP3-56H and O1Ca-VP3-56R, respectively), and characterized their in vitro phenotype and virulence in the natural host. Both viruses showed similar growth kinetics in vitro. Conversely, they had distinct temperature-sensitivity (ts) and displayed significantly different pathogenic profiles in cattle and swine. O1Ca-VP3-56H was thermo stable and induced typical clinical signs of FMD, whereas O1Ca-VP3-56R presented a ts phenotype and was nonpathogenic unless VP3 position 56 reverted in vivo to either H or cysteine (C).
Agricultural Research Service, US Department of Agriculture, Plum Island Animal Disease Center, Greenport, New York 11944-0848, USA.
Manuel V
MV
Borca
Juan M
JM
Pacheco
Lauren G
LG
Holinka
Consuelo
C
Carrillo
Ethan
E
Hartwig
Damià
D
Garriga
Edward
E
Kramer
Luis
L
Rodriguez
Maria E
ME
Piccone
D000595:Amino Acid Sequence; D000818:Animals; D000940:Antigenic Variation; D001483:Base Sequence; D036022:Capsid Proteins / Q000096:biosynthesis / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D002417:Cattle; D002460:Cell Line; D006224:Cricetinae; D005536:Foot-and-Mouth Disease / Q000821:virology*; D029544:Foot-and-Mouth Disease Virus / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000472:pathogenicity*; D014644:Genetic Variation; D009500:Neutralization Tests; D010641:Phenotype; D012367:RNA, Viral / Q000235:genetics; D017423:Sequence Analysis, RNA; D012756:Sheep; D013552:Swine; D013696:Temperature
D036022:Capsid Proteins; D012367:RNA, Viral; C442460:VP3 protein, Foot-and-mouth disease virus