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. 1991 Oct;11(10):5266–5274. doi: 10.1128/mcb.11.10.5266

The 40-kilodalton to autoantigen associates with nucleotides 21 to 64 of human mitochondrial RNA processing/7-2 RNA in vitro.

Y Yuan 1, E Tan 1, R Reddy 1
PMCID: PMC361579  PMID: 1717826

Abstract

A 40-kDa To antigen recognized by sera from some patients with autoimmune diseases is an integral component of both human RNase P and mitochondrial RNA processing (MRP) RNase. Human MRP and RNase P RNAs, synthesized in vitro, readily associate with the To antigen present in the HeLa cell extract. Using this in vitro reconstitution system, the binding site of the To antigen is localized to a 44-nucleotide-long sequence corresponding to nucleotides 21 to 64 of the human MRP RNA. UV cross-linking experiments showed that the To antigen binds directly to MRP RNA and to RNase P (H1) RNA through RNA-protein interactions. Although the MRP RNA and RNAse P (H1) RNA show sequence homology in four conserved blocks (H. A. Gold, J. N. Topper, D. A. Clayton, and J. Craft, Science 245:1377-1380, 1989), the To antigen-binding site in MRP RNA does not show any obvious primary sequence homology with H1 RNA. These data suggest that the To antigen binds to a conserved and presumably a common secondary or tertiary structure in human MRP and RNase P RNAs.

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