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. 1994 Sep;14(9):6068–6074. doi: 10.1128/mcb.14.9.6068

Purification and characterization of nucleolin and its identification as a transcription repressor.

T H Yang 1, W H Tsai 1, Y M Lee 1, H Y Lei 1, M Y Lai 1, D S Chen 1, N H Yeh 1, S C Lee 1
PMCID: PMC359133  PMID: 8065340

Abstract

Expression of the acute-phase response genes, such as that for alpha-1 acid glycoprotein (AGP), involves both positive and negative transcription factors. A positive transcription factor, AGP/EBP, and a negative transcription factor, factor B, have been identified as the two most important factors responsible for the induction of the AGP gene. In this paper we report the purification, characterization, and identification of a B-motif-binding factor from the mouse hepatoma cell line 129p. The purified factor has been identified as nucleolin by amino acid sequence analysis. Biochemical and functional studies further established that nucleolin is a transcription repressor for regulation of AGP and possibly other acute-phase response genes. Thus, in addition to the many known functions of nucleolin, such as rRNA transcription, processing, ribosome biogenesis, and the shuttling of proteins between the cytoplasmic and nuclear compartments, it may also function as a transcriptional repressor.

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