Isolating Microbial Proteins That Regulate Cellular Protein Stability

This patent identifies specific genetic sequences from microbes that produce proteins capable of modifying SUMO, a key molecule that controls how other proteins behave inside cells.

What it covers

The patent claims the specific genetic code (nucleic acid molecule) that instructs a cell to build a protein containing a SUMO-specific protease-like (SSP) domain. These proteins act like molecular scissors, cutting SUMO proteins away from other proteins to regulate their function or lifespan. By isolating these sequences, researchers can insert them into vectors—small vehicles used to deliver DNA—and introduce them into bacterial, yeast, or mammalian cells to study how these microbial enzymes affect cell health or disease.

What it doesn't cover

• —Does not cover naturally occurring SUMO proteases found in humans or other animals.
• —Does not cover the general concept of protein modification, only the specific sequences identified as SEQ ID NO:27.
• —Does not cover diagnostic methods that do not utilize the specific SSP domain sequences defined in the claims.

The clever bit

The inventors identified that diverse microorganisms, from common gut bacteria to parasites, possess enzymes structurally similar to human SUMO-proteases, suggesting these microbes use similar 'molecular switches' to survive.

Why it matters

SUMO (Small Ubiquitin-like Modifier) proteins are essential for managing protein traffic and stability in cells. Because many pathogens use these enzymes to manipulate host cells, identifying microbial versions of these proteins provides a roadmap for developing new antibiotics or anti-parasitic drugs that target the pathogen's ability to survive within a host.

Real-world examples

• 1.Laboratory research on the protein-degradation pathways of pathogens like Salmonella.
• 2.Development of recombinant protein expression systems for biotechnology.