Neurosci Lett 1988 Jun 29;892:246-50. doi: 10.1016/0304-3940(88)90389-8.

ID sequence-binding protein factor complexed in ribonucleoprotein particles.

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We analyzed brain extracts from fetal or adult mice with a 32P-labeled 5'-half fragment of identifier (ID) sequence in a gel mobility shift assay. Upon digestion of extracts with RNase A prior to the binding reactions, a protein factor(s) that specifically binds to the fragment was shown to appreciably increase in amount with either of the extracts. Furthermore, the binding was competed with single-stranded ID sequences. These observations suggest that the protein factor is capable of interacting with either the genes or their small RNA transcripts.

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