Human ROBO1 is cleaved by metalloproteinases and gamma-secretase and migrates to the nucleus in cancer cells.

Abstract

ROBO1 is a receptor mediating Slit-induced repulsive action on axon guidance and differentially expressed in human cancers. Although ROBO1 ectodomain has been detected, the cleavage site had not been determined. In this study we identified the precise cleavage site of ROBO1. We also report multi-step proteolysis of ROBO1 by metalloproteinases and gamma-secretase, producing two carboxy-terminal fragments, ROBO1-CTF1 at 129-kDa and ROBO1-CTF2 at 118-kDa. We have further demonstrated nuclear accumulation of ROBO1, which is abolished by either a metalloproteinase inhibitor TAPI-1 or a gamma-secretase inhibitor L-685,458. ROBO1 may function beyond the receptor through stepwise cleavages and translocation to the nucleus.

• Authors: Motoaki Seki, Akira Watanabe, Satoshi Enomoto, Takeshi Kawamura, Hirotaka Ito, Tatsuhiko Kodama, Takao Hamakubo, Hiroyuki Aburatani
• Journal: FEBS letters (FEBS Lett) Vol. 584 Issue 13 Pg. 2909-15 (Jul 02 2010) ISSN: 1873-3468 [Electronic] England
• PMID: 20471383 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright 2010 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

Chemical References

• Carbamates
• Dipeptides
• Hydroxamic Acids
• L 685458
• Leupeptins
• N-((2-(hydroxyaminocarbonyl)methyl)-4-methylpentanoyl)-3-(2'-naphthyl)alanylalanine, 2-aminoethylamide
• N-(2(R)-2-(hydroxamidocarbonylmethyl)-4-methylpentanoyl)-L-tryptophan methylamide
• Nerve Tissue Proteins
• Receptors, Immunologic
• Amyloid Precursor Protein Secretases
• Metalloproteases
• benzyloxycarbonylleucyl-leucyl-leucine aldehyde

Topics

• Amino Acid Sequence
• Amyloid Precursor Protein Secretases (antagonists & inhibitors, metabolism)
• Carbamates (pharmacology)
• Cell Nucleus (metabolism)
• Dipeptides (pharmacology)
• Hep G2 Cells
• Humans
• Hydroxamic Acids (pharmacology)
• Immunoblotting
• Immunohistochemistry
• Leupeptins (pharmacology)
• Metalloproteases (antagonists & inhibitors, metabolism)
• Molecular Sequence Data
• Nerve Tissue Proteins (chemistry, metabolism)
• Receptors, Immunologic (chemistry, metabolism)
• Sequence Homology, Amino Acid
• Tandem Mass Spectrometry
• Roundabout Proteins