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RaDAR guides proteins into the nucleus
Date:5/22/2014

ents revealed that a widely shared element of protein structure found in ASPP, known as the ankyrin repeat (AR), plays a central role in the protein's nuclear localization.

Lu's team shows in the study that the import signal that flags proteins for the new pathway consists of two consecutive ARs that share one feature: each has a hydrophobic amino acid (one with chemical properties that repel water) that is located 13 amino acids into the repeat. This structural signature, they find, is bound by a small protein named RanGDP. Lu and her colleagues have named this new pathway the RaDAR (RanGDP-Ankyrin Repeat) nuclear import pathway. They have so far identified more than 46 proteins encoded by the human genome that carry this barcode for nuclear delivery.

In decoding this new nuclear import signal, Lu and her team also uncover a possible molecular mechanism underlying human familial melanomas, which are often linked to mutations in a protein known as p16. "We show that the p16 mutation most frequently associated with such cancers," Lu explains, "confers the RaDAR barcode to the protein, resulting in its aberrant accumulation in the nucleus." The RaDAR signature is also associated with a number of regulators of cell proliferation and gene regulation, including the NF-kB family of proteins, which shuttle between the cytoplasm and nucleus, and have been implicated in several human cancers, and autoimmune and inflammatory diseases.

Lu's team is now investigating the spectrum of proteins that use the RaDAR pathway and exploring methods by which the ankyrin repeat that bears that barcode might be exploited to develop entirely novel diagnostics and therapies. That includes incorporating the new nuclear import barcode into synthetic molecules named DARPins to target biologics and other kinds of drugs specifically to the nucleus.


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Contact: Rachel Steinhardt
rsteinhardt@licr.org
212-450-1582
Ludwig Institute for Cancer Research
Source:Eurekalert

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