RESEARCH: CANCER
FOLDING PROJECT #16581 PROFILE

This project looks at how changes in a protein called PP2A can cause problems like intellectual disability and cancer. Researchers found that a specific mutation weakens PP2A's ability to control itself, making it more active. They used computer models and experiments to understand how this happens and are now studying the shapes of the protein to see why the mutation makes PP2A so active.

Note: This TLDR is a simplication and may not be 100% accurate.

Protein phosphatase 2A (PP2A) mutations have been linked to intellectual disability and cancer, potentially disrupting the protein’s autoinhibition mechanism and phosphorylation-induced activation.

The mutations are located distant from the active and substrate sites, their impact on the mechanism remains unclear.

Allosteric pathway analysis, integrated with biochemical experiments, probes PP2A autoinhibition.

In the wild-type (WT) system, regulatory subunit B56δ's C-arm impedes active and substrate sites, enacting dual autoinhibition.

The disease mutant, E198K, markedly weakens the WT's allosteric pathways by taking a different route, favoring substrate site exposure.

A novel path clustering algorithm, introduced in this work, streamlines the allosteric pathway analysis.

E198K and phosphorylated WT share strikingly similar allosteric channels, suggesting a conserved autoinhibition alleviation between these variants.

Folding at home will be used to study the conformational change involved in the opening of this N/C-arm interface in order to determine why the E198K mutant is more active than the WT.

---

Protein phosphatase 2A

An enzyme that removes phosphate groups from proteins.

Protein phosphatase 2A (PP2A) is a crucial enzyme involved in regulating cellular processes by removing phosphate groups from proteins. This dephosphorylation activity plays a vital role in various functions like cell growth, division, and signal transduction.

---

Mutations

Permanent alterations in the DNA sequence.

Mutations are changes that occur in the DNA sequence. These alterations can be small, involving a single nucleotide, or large, affecting entire chromosomes. Mutations can have various effects on organisms, ranging from being harmless to causing diseases.

---

Intellectual Disability

A condition characterized by limitations in intellectual functioning and adaptive behavior.

Intellectual disability is a developmental disorder that affects cognitive abilities such as learning, problem-solving, and communication. It also impacts adaptive behaviors necessary for daily living. The severity of intellectual disability can vary widely.

---

Cancer

A group of diseases characterized by uncontrolled cell growth.

Cancer is a broad term encompassing various diseases where cells grow and divide uncontrollably. This abnormal growth can invade surrounding tissues and spread to other parts of the body.

---

Autoinhibition

A regulatory mechanism where a molecule inhibits its own activity.

Autoinhibition is a process where a molecule or protein regulates its own activity by binding to itself. This can act as a control mechanism, preventing excessive or uncontrolled activity.

---

Phosphorylation

The addition of a phosphate group to a molecule.

Phosphorylation is a chemical process where a phosphate group is added to a molecule. This often serves as a way to activate or deactivate proteins, influencing various cellular processes like signaling and metabolism.

---

Allosteric Pathway

A pathway involving molecules that bind to a protein at sites other than the active site, influencing its activity.

Allosteric pathways are regulatory mechanisms where molecules interact with proteins at specific sites called allosteric sites. This binding can either activate or inhibit the protein's function.

---

Wild-type (WT)

The normal or most common form of a gene or organism.

Wild-type refers to the typical or standard form of a gene or organism. It's often used as a comparison to mutant forms.

---

E198K

A specific point mutation in the gene coding for PP2A.

E198K is a genetic mutation where the amino acid glutamic acid (E) at position 198 is replaced by lysine (K) in the protein sequence.