RESEARCH: AAA-PROTEIN-SUPERFAMILY
FOLDING PROJECT #19327 PROFILE

This project looks at how Rubisco activase (Rca), a protein that helps plants make sugar, uses energy from ATP to work. Scientists will use computer simulations to understand how Rca binds to ATP and ADP, and which parts of the protein are 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+

ATPases Associated with diverse cellular Activities

AAA+ is a superfamily of proteins crucial for various cell functions like DNA replication, protein folding, and organelle formation. They bind and hydrolyze ATP to power these activities.

ATPase

An enzyme that catalyzes the hydrolysis of ATP (adenosine triphosphate) to ADP (adenosine diphosphate) and inorganic phosphate.

ATPases are enzymes that break down ATP, a molecule that cells use for energy. This process releases energy that powers many cellular functions.

ATP

Adenosine triphosphate

ATP is the primary energy currency of cells. It stores and releases energy for various cellular processes like muscle contraction, protein synthesis, and nerve impulse transmission.

ADP

Adenosine diphosphate

ADP is a molecule produced when ATP loses a phosphate group. It can be converted back into ATP to continue providing energy for cellular processes.

Mg2+

Magnesium ion

Mg2+ is an essential mineral and cofactor for many enzymes, including those involved in ATP hydrolysis and cellular signaling.

Rubisco activase (Rca)

A protein that activates Rubisco, the enzyme responsible for carbon fixation in photosynthesis.

Rubisco activase (Rca) helps plants carry out photosynthesis by activating Rubisco, the enzyme that converts carbon dioxide into sugar. This process is essential for plant growth and food production.