RESEARCH: MG2-ION-BINDING
FOLDING PROJECT #19304 PROFILE

This project looks at how Rubisco activase (Rca), a protein important for plant growth, uses energy from ATP to change shape and do its job. By using computer simulations, researchers will figure out how Rca binds to ATP and ADP, and which parts of the protein are most important for this process.

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 superfamily of enzymes crucial for many cellular processes like DNA replication and protein folding. They use ATP energy to change the shape of other molecules.

ATP binding

The process where a cell attaches adenosine triphosphate (ATP) to a molecule or protein.

ATP binding is when cells attach energy-carrying molecules called ATP to other molecules. This helps power various cellular processes.

ATP hydrolysis

The process where ATP is broken down to release energy.

ATP hydrolysis is like breaking down an energy storage unit (ATP) to release the stored power for cellular tasks.

Rubisco activase

An enzyme that activates Rubisco.

Rubisco activase is a protein that helps activate an enzyme called Rubisco, which is essential for photosynthesis in plants.

ADP/ATP binding

The process where a molecule binds to a protein that can bind both ADP and ATP.

ADP/ATP binding is when molecules like ADP and ATP attach to proteins that regulate energy flow in cells.

Mg2+ ion

A magnesium ion.

Mg2+ ions are important for many cellular processes, including helping enzymes work properly.