RESEARCH: AAA-PROTEIN-SUPERFAMILY
FOLDING PROJECT #19326 PROFILE

This project looks at Rubisco activase (Rca), a protein that helps plants make food. Using computer simulations, researchers will figure out how Rca uses energy from ATP to bind ADP and magnesium ions, which are important for its function. This could lead to better understanding of plant growth and development.

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

A superfamily of proteins involved in diverse cellular activities.

AAA+ proteins are a large group of proteins found in all living things. They play important roles in many cellular processes, such as protein folding, DNA repair, and cell division. These proteins work by binding to ATP (a molecule that provides energy for cells) and using its energy to change shape and carry out their functions.

ATPases

Enzymes that break down ATP (adenosine triphosphate) to release energy.

ATPases are enzymes that use the chemical energy stored in ATP to power various cellular processes. They are essential for a wide range of functions, including muscle contraction, nerve impulse transmission, and protein synthesis.

Walker A and B motifs

Conserved amino acid sequences in AAA+ proteins that are essential for ATP binding and hydrolysis.

Walker A and B motifs are specific patterns of amino acids found in the structure of AAA+ proteins. These motifs play a crucial role in allowing these proteins to bind to and break down ATP, providing energy for their functions.

Rubisco activase (Rca)

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

Rubisco activase (Rca) is a crucial enzyme involved in photosynthesis. It helps to activate Rubisco, the main enzyme responsible for capturing carbon dioxide from the air and converting it into sugars. This process is essential for plant growth and food production.

ADP

Adenosine diphosphate.

ADP is a molecule that carries energy within cells. It's produced when ATP is broken down and used to power various cellular processes. ADP can be converted back into ATP through cellular respiration.

Mg2+

Magnesium ion.

Mg2+ is a positively charged form of the mineral magnesium. It plays a vital role in many cellular processes, including enzyme activity, DNA replication, and muscle function.