An international team led by scientists at the University of Birmingham has identified a previously overlooked “helper” protein, MRAP2, that is necessary for a key appetite-regulating receptor, MC3R, to signal properly — a discovery that may explain how certain genetic changes raise obesity risk. The findings, published in Science Signalling on December 16, show that when MRAP2 does not function correctly, signals that tell the body whether to burn or store energy can weaken, undermining appetite control and energy balance.
Researchers built on earlier work showing MRAP2 is essential for the related receptor MC4R, known to control hunger. To test whether MRAP2 plays a similar role with MC3R, the team used cell models to observe the proteins’ interactions. They found that when MRAP2 and MC3R were present in balanced amounts, cellular signalling through MC3R strengthened, indicating MRAP2 helps MC3R perform its role in balancing energy intake and use.
The group also mapped specific regions of MRAP2 required to support signalling through both MC3R and MC4R. When the researchers introduced variants of MRAP2 carrying genetic mutations previously found in some people with obesity, those mutant forms failed to boost MC3R signalling; as a result, the appetite-regulating receptor responded less effectively. These results suggest that MRAP2 mutations can disrupt the hormonal circuitry that maintains energy balance.
“The findings give us some important insights into what’s going on in the hormonal system,” Dr. Caroline Gorvin, lead author and Associate Professor at the University of Birmingham, said, adding that identifying MRAP2 as a critical supporter gives new clues about genetic predisposition to obesity and its risks.
By clarifying how MRAP2 supports appetite-related signalling, scientists hope to explore drugs that target this helper protein — therapies that might strengthen fullness cues, reduce overeating and improve energy balance for people who do not respond to dieting alone. The study was conducted by researchers in the Department of Metabolism and Systems Science and the Centre of Membrane Proteins and Receptors (COMPARE), a cross‑university centre involving the Universities of Birmingham and Nottingham, supported by advanced imaging facilities.
Original Source: https://www.sentinelassam.com/topheadlines/this-tiny-protein-helps-control-how-hungry-you-feel-study-2
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Publish Date: 2026-02-13 10:12:00
