A duplicated fold is the structural basis for polynucleotide phosphorylase catalytic activity, processivity, and regulation by M. F. Symmons and others

M. F. Symmons, G. H. Jones, B. F. Luisi; Structure8(11),1215–1226(2000), DOI10.1016/S0969-2126(00)00521-9. Publisher primary abstract www.sciencedirect.com/science/article/pii/S0969212600005219 : X-ray structure of Streptomyces antibioticus PNPase without bound RNA but with tungstate at catalytic sites, trimer and central channel. A possible channel role in processivity is proposed, not direct observation of RNA transit. No initials expanded.