RESEARCH: MG2-ION-BINDING
FOLDING PROJECT #19308 PROFILE

This project looks at how Rubisco activase (Rca), a protein that uses energy from ATP, binds to molecules like ADP and ATP. By using computer simulations, researchers hope to understand the steps involved in this binding process and identify important parts of the Rca protein that are involved.

Atomistic insights into AAA+ protein superfamily ATPases Associated with diverse cellular Activities (AAA+) comprise a superfamily of proteins that perform a large variety of functions essential to cell physiology, including control of protein homeostasis, DNA replication, recombination, chromatin remodeling, ribosomal RNA processing, molecular targeting, organelle biogenesis, and membrane fusion.

Members of this superfamily are defined by the presence of what is termed the AAA+ domain containing the canonical Walker A and B motifs required for ATP binding and hydrolysis.

Typically, genomes encode approximately ten to several hundred AAA+ family members, each of which is thought to be adapted to specific functional niches that necessitate precise mechanisms of substrate recognition and processing.

The striking adaptive radiation of AAA+ proteins to operate in diverse settings illustrates the versatile utility of the AAA+ domain.

AAA+ proteins typically form hexameric complexes and act as motors to remodel other proteins, DNA/RNA, or multicomponent complexes.

Indeed, many chaperones and ATP-dependent proteases are or have subunits that belong to this superfamily.

Rubisco activase (Rca) belongs to the AAA+ superfamily of proteins and it hydrolyzes ATP to ADP.

The complementarity of nucleotide-binding sites between AAA+ interfaces, the mechanism of ATP hydrolysis and the conformational changes activating or deactivating their ATP-binding pocket ensure a functional cycle that creates mechanical force to promote remodeling of substrates.

In this study, we will investigated the ADP/ATP and Mg2+ ion binding mechanism in Rca monomer and homodimers using extensive longtime scale simulations.

We will also try to find the binding pathway for ADP and ATP.

Simulations will also helps to predicts the crucial residues that involved in this binding process.

AAA+ protein

ATPases Associated with diverse cellular Activities

AAA+ proteins are a large family of enzymes crucial for many cellular functions like protein folding, DNA repair, and cell division. They use energy from ATP to move and change other molecules.

ATP binding

The process where a molecule of adenosine triphosphate (ATP) binds to a specific protein or enzyme.

ATP binding is how cells power many processes. Proteins have special sites that bind to ATP, which then releases energy for the protein to do its job.

ATP hydrolysis

The breakdown of ATP into ADP and inorganic phosphate (Pi), releasing energy.

ATP hydrolysis is like a cell's way of paying for its activities. When a protein needs to do work, it breaks down ATP, which releases energy to power the process.

Rubisco activase (Rca)

An enzyme that activates Rubisco, the key enzyme in photosynthesis.

Rubisco activase is essential for plants to photosynthesize. It helps activate Rubisco, which captures carbon dioxide and uses it to make sugar.

ADP

Adenosine diphosphate

ADP is a molecule that's formed when ATP releases energy. It can be converted back to ATP when more energy is needed.

Mg2+

Magnesium ion

Mg2+ is a mineral that plays many roles in the body, including helping enzymes function properly.