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cullin 3

The CUL3 gene provides instructions for making a protein called cullin-3. This protein plays a role in the ubiquitin-proteasome system, which breaks down (degrades) unwanted proteins inside cells.

Normal function

The CUL3 gene provides instructions for making a protein called cullin-3. This protein plays a role in the ubiquitin-proteasome system, which breaks down (degrades) unwanted proteins inside cells.

The ubiquitin-proteasome system acts as the cell's quality control system by disposing of damaged, misshapen, and excess proteins. Cullin-3 is a core piece of a complex known as an E3 ubiquitin ligase. E3 ubiquitin ligases tag proteins with molecules called ubiquitin. Ubiquitin signals specialized cell structures known as proteasomes to attach (bind) to the tagged proteins and degrade them.  The ubiquitin-proteasome system also regulates several critical cell activities by controlling the amounts of proteins involved in them.

E3 ubiquitin ligases that contain cullin-3 tag many proteins that perform a variety of functions, such as cell growth and division. These ligases also tag blood pressure-related proteins called WNK1 and WNK4, which are produced from the WNK1 and WNK4 genes.  By regulating the amount of WNK1 and WNK4 available, cullin-3 plays a role in blood pressure control.

Conditions referring to this gene or chromosome

Other names

CUL-3

cullin-3 isoform 1

cullin-3 isoform 2

cullin-3 isoform 3

PHA2E

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