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. 1994 Oct 11;91(21):9670–9674. doi: 10.1073/pnas.91.21.9670

A nuclear factor containing the leucine-rich repeats expressed in murine cerebellar neurons.

K Matsuoka 1, M Taoka 1, N Satozawa 1, H Nakayama 1, T Ichimura 1, N Takahashi 1, T Yamakuni 1, S Y Song 1, T Isobe 1
PMCID: PMC44878  PMID: 7937870

Abstract

A nuclear protein, termed leucine-rich acidic nuclear protein (LANP), has been isolated from among rat cerebellar proteins whose expression was transiently increased during an early stage of postnatal development. The amino acid sequence, deduced from its cDNA, showed that LANP contains 247 amino acids consisting of two distinct structural domains: the N-terminal domain characterized by "leucine-rich repeat," which is found in many eukaryotic proteins and which potentially functions in mediating protein-protein interactions, and the C-terminal domain characterized by a cluster of acidic amino acids with a putative nuclear localization signal. Immunohistochemical study using an antibody against LANP revealed that the protein is localized mainly in nuclei of Purkinje cells. In the rat cerebellum on postnatal day 7, LANP mRNA was expressed moderately in the external granule and Purkinje cells and weakly in the internal granule cells. The expression in these cells, especially in Purkinje cells, increased in the second postnatal week and thereafter decreased to an adult level. The structural characteristics, localization, and the stage- and cell type-specific expression suggest a potential role of LANP in a signal transduction pathway that directs differentiation of cerebellar neurons.

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