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Structure-function relationships among RNA-dependent RNA polymerases Ng KK; Arnold JJ; Cameron CECurr Top Microbiol Immunol 2008[]; 320 (ä): 137-56RNA-dependent RNA polymerases (RdRPs) play key roles in viral transcription and genome replication, as well as epigenetic and post-transcriptional control of cellular gene expression. In this article, we review the crystallographic, biochemical, and molecular genetic data available for viral RdRPs that have led to a detailed description of substrate and cofactor binding, fidelity of nucleotide selection and incorporation, and catalysis. It is likely that the cellular RdRPs will share some of the basic structural and mechanistic principles gleaned from studies of viral RdRPs. Therefore, studies of the viral RdRP establish a framework for the study of cellular RdRPs, an important yet understudied class of nucleic acid polymerases.|Amino Acid Sequence[MESH]|Animals[MESH]|Crystallography, X-Ray[MESH]|Molecular Sequence Data[MESH]|Protein Structure, Tertiary[MESH]|RNA Viruses/*enzymology[MESH]|RNA-Dependent RNA Polymerase/*chemistry/*metabolism[MESH]|Sequence Alignment[MESH]|Structure-Activity Relationship[MESH]|Viral Proteins/*chemistry/*metabolism[MESH] |
