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Nucleic Acids Res
1993 Feb 25;214:999-1006. doi: 10.1093/nar/21.4.999.
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Three new members of the RNP protein family in Xenopus.
Good PJ
,
Rebbert ML
,
Dawid IB
.
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Many RNP proteins contain one or more copies of the RNA recognition motif (RRM) and are thought to be involved in cellular RNA metabolism. We have previously characterized in Xenopus a nervous system specific gene, nrp1, that is more similar to the hnRNP A/B proteins than to other known proteins (K. Richter, P. J. Good, and I. B. Dawid (1990), New Biol. 2, 556-565). PCR amplification with degenerate primers was used to identify additional cDNAs encoding two RRMs in Xenopus. Three previously uncharacterized genes were identified. Two genes encode hnRNP A/B proteins with two RRMs and a glycine-rich domain. One of these is the Xenopus homolog of the human A2/B1 gene; the other, named hnRNP A3, is similar to both the A1 and A2 hnRNP genes. The Xenopus hnRNP A1, A2 and A3 genes are expressed throughout development and in all adult tissues. Multiple protein isoforms for the hnRNP A2 gene are predicted that differ by the insertion of short peptide sequences in the glycine-rich domain. The third newly isolated gene, named xrp1, encodes a protein that is related by sequence to the nrp1 protein but is expressed ubiquitously. Despite the similarity to nuclear RNP proteins, both the nrp1 and xrp1 proteins are localized to the cytoplasm in the Xenopus oocyte. The xrp1 gene may have a function in all cells that is similar to that executed by nrp1 specifically within the nervous system.
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