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. 1991 Mar 25;19(6):1273–1278. doi: 10.1093/nar/19.6.1273

A differentially expressed murine RNA encoding a protein with similarities to two types of nucleic acid binding motifs.

M Ayane 1, U Preuss 1, G Köhler 1, P J Nielsen 1
PMCID: PMC333853  PMID: 2030943

Abstract

Using differential screening, a murine cDNA, termed X16, was isolated corresponding to an mRNA which is more strongly expressed in pre-B cell lines relative to mature B-cell lines. The complete coding sequence of the mRNA predicts a 19kD protein with two domains connected by a proline-rich spacer. The N-terminal domain of about 90 amino acids encodes an RNA binding motif including the ribonucleoprotein consensus octapeptide found in one class of RNA-binding proteins and highly conserved from yeast to man. Within the very basic C-terminal domain of about 60 amino acids, several copies of two different peptides are found which are also present in several proteins which bind DNA or RNA. The expression of X16 is not limited to the lymphoid lineage. In adult mice, although the strongest expression was seen in thymus, mRNA was also found in testis, brain, spleen, and very low in heart. X16 mRNA was not detected in liver and kidney. In tissue culture, the expression of X16 mRNA can be induced by serum. The conserved protein motifs and expression pattern suggest that X16 could be involved in RNA processing correlating with cellular proliferation.

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