Deubiquitinases: A Backdoor into Undruggable Targets?

Molecular model of the yeast proteasome.

Molecular model of the yeast proteasome.

Ubiquitin modification of a protein directs events such as targeting for proteasomal degradation. Targeting a protein for degradation through ubiquitin modification is one way to regulate the amount of time a signaling protein, such as a kinase or other enzyme, is available to participate in cell signaling events. Deubiquitinases (DUBs) are enzymes that cleave the ubiquitin tags from proteins, and they have been implicated in several diseases, including cancer.

With their roles in the stabilization of proteins involved in cell cycle progression and other critical processes, DUBs are promising targets for small molecule inhibitors, particularly since they may provide a “back door” for targeting otherwise intractable, undruggable proteins by modulating their half lives. However, finding small molecule inhibitors of the ubiquitin proteases to date has not been trivial. Here we highlight two papers describing the identification and characterization of small molecule inhibitors against the DUB USP7. Continue reading

Shining a Bright Light on Deep Questions in Biology with Bioluminescence

artists view inside a cellA quick search of the PubMed database for “dual luciferase” quickly returns over 1,000 papers. The Dual-Luciferase® Reporter Assay is a powerful tool that allows researchers to ask a multitude of questions about gene control and expression in a system that itself could be normalized and internally controlled. For more than 15 years, firefly and Renilla luciferases have been valuable tools for researchers asking many different kinds of questions in the life sciences. In a recent webinar, Biologically Relevant Assays for Oncology: Harnessing the Power of Bioluminescence, Neal Cosby discussed how bioluminescent chemistries have formed the basis of a range of powerful assays and research tools for scientists who are asking questions about the deep and complex genetic and cellular story associated with cancer. Here we talk a bit of about bioluminescent chemistries, some of the newest bioluminescent tools available, and how some of these tools can be used to probe the deeper questions of cell biology, including cancer biology. Continue reading

Considerations for Successful Cell-Based Assays 3: Treatment Parameters

Welcome to the third installment of our series on cell-based assays. Designed for the newbie to the world of cell-based assays, we have covered the topics of choosing your cell type and basic cell culture tips in the previous posts. In this post, we will discuss how decisions about test compound treatment: how much and how long can affect assay results and interpretation. Continue reading

Considerations for Successful Cell Based Assays II: Cell Culture Conditions

This is the second in a series of blog posts covering topics to consider when designing and performing cell-based assays. In the first installment, we discussed the importance of choosing the right cell type for your assay. Here we will discuss how cell culture conditions can influence assay results. Continue reading

Considerations for Successful Cell-Based Assays I: Choosing Your Cells

For those of us entering the world of cell-based assays from a classical or molecular genetics background, the world of cell culture can be daunting. Yet to truly understand how the genetic mutation behind a particular phenotype works, we need to look at the biochemistry and cell biology where it all occurs: the cell.

This series of blogs will cover several topics to consider when designing your cell-based assays. In this first installment, we discuss the basics of choosing the cell type for your assay. Continue reading