Myeloid leukemia factor 1 associates with a novel heterogeneous nuclear ribonucleoprotein U-like molecule.

Abstract

Myeloid leukemia factor 1 (MLF1) is an oncoprotein associated with hemopoietic lineage commitment and acute myeloid leukemia. Here we show that Mlf1 associated with a novel binding partner, Mlf1-associated nuclear protein (Manp), a new heterogeneous nuclear ribonucleoprotein (hnRNP) family member, related to hnRNP-U. Manp localized exclusively in the nucleus and could redirect Mlf1 from the cytoplasm into the nucleus. The nuclear content of Mlf1 was also regulated by 14-3-3 binding to a canonical 14-3-3 binding motif within the N terminus of Mlf1. Significantly Mlf1 contains a functional nuclear export signal and localized primarily to the nuclei of hemopoietic cells. Mlf1 was capable of binding DNA, and microarray analysis revealed that it affected the expression of several genes, including transcription factors. In summary, this study reveals that Mlf1 translocates between nucleus and cytoplasm, associates with a novel hnRNP, and influences gene expression.

• Authors: Louise N Winteringham, Raelene Endersby, Simon Kobelke, Ross K McCulloch, James H Williams, Justin Stillitano, Scott M Cornwall, Evan Ingley, S Peter Klinken
• Journal: The Journal of biological chemistry (J Biol Chem) Vol. 281 Issue 50 Pg. 38791-800 (Dec 15 2006) ISSN: 0021-9258 [Print] United States
• PMID: 17008314 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Cell Cycle Proteins
• DNA, Complementary
• DNA-Binding Proteins
• Heterogeneous-Nuclear Ribonucleoprotein U
• Mlf1 protein, mouse
• Proteins

Topics

• Amino Acid Sequence
• Animals
• Base Sequence
• COS Cells
• Cell Cycle Proteins
• Cell Nucleus (metabolism)
• Chlorocebus aethiops
• DNA, Complementary
• DNA-Binding Proteins
• Heterogeneous-Nuclear Ribonucleoprotein U (metabolism)
• Molecular Sequence Data
• Protein Binding
• Proteins (chemistry, genetics, metabolism)