Reaction: Autocatalytically cleaves itself from the polyprotein of the foot-and-mouth disease virus by hydrolysis of a LysGly bond, but then cleaves host cell initiation factor eIF-4G at bonds -GlyArg- and -LysArg-
Comments: Best known from foot-and-mouth disease virus, but occurs in other aphthoviruses and cardioviruses. Destruction of initiation factor eIF-4G has the effect of shutting off host-cell protein synthesis while allowing synthesis of viral proteins to continue. The tertiary structure reveals a distant relationship to papain and, consistent with this, compound E-64 is inhibitory. Type example of peptidase family C28.
Links to other databases: BRENDA, EXPASY, KEGG, MEROPS, Metacyc, PDB, CAS registry number:
1 . Piccone, M.E., Zellner, M., Kumosinski, T.F., Mason, P.W. and Grubman, M.J. Identification of the active-site residues of the L proteinase of foot-and-mouth disease virus. J. Virol. 69 (1995) 4950-4956. [PMID: 7609064]
2. Guarné, A., Hampoelz, B., Glaser, W., Carpena, X., Torma, J., Fita, I. and Skern, T. Structural and biochemical features distinguish the foot-and-mouth disease virus leader proteinase from other papain-like enzymes. J. Mol. Biol. 302 (2000) 1227-1240. [PMID: 11183785]