This entry relates to a regulatory domain found in replicase polyprotein 1ab found in Arterivirus. Structural studies of arterivirus helicase (nsp10), indicate that this domain undergoes conformational changes on substrate binding. Besides the large ...
This entry relates to a regulatory domain found in replicase polyprotein 1ab found in Arterivirus. Structural studies of arterivirus helicase (nsp10), indicate that this domain undergoes conformational changes on substrate binding. Besides the large conformational change, it is suggested that the regions at the surface of domain 1B not directly involved in DNA binding may become flexible. For example, domain 1B residues Arg95, Gly125 and Ala131 become disordered after DNA binding. Together with domains 1A and 2A it forms a nucleic acid-binding channel where the single-stranded part of the DNA substrate is bound to [1].
This entry represents the (+) RNA virus helicase core domain. The (+) RNA virus helicase core contains two RecA-like alpha/beta domains. The N-terminal ATP-binding domain contains a parallel six-stranded alpha-sheet surrounded by four helices on one ...
This entry represents the (+) RNA virus helicase core domain. The (+) RNA virus helicase core contains two RecA-like alpha/beta domains. The N-terminal ATP-binding domain contains a parallel six-stranded alpha-sheet surrounded by four helices on one side and two helices on the other. The C-terminal domain contains a parallel four-stranded beta-sheet sandwiched between two helices on each of its sides. The (+) RNA virus helicase core is likely to bind NTP in cleft between the N terminus of the ATP-binding domain and the beginning of the C-terminal domain [2,5]. Helicase activity for this domain has been demonstrated [1]. This helicase has multiple roles at different stages of viral RNA replication, as dissected by mutational analysis [3].
This is a zinc binding domain found in nidovirus helicase. It includes includes 12 or 13 conserved Cys/His residues. Amino acid substitutions in ZBD or the adjacent spacer that connects it to the downstream domain can profoundly affect EAV (equine ar ...
This is a zinc binding domain found in nidovirus helicase. It includes includes 12 or 13 conserved Cys/His residues. Amino acid substitutions in ZBD or the adjacent spacer that connects it to the downstream domain can profoundly affect EAV (equine arteritis virus) helicase activity and RNA synthesis, with most replacements of conserved Cys or His residues yielding replication-negative virus phenotypes [1].
