RESEARCH: MG2-ION-BINDING
FOLDING PROJECT #19315 PROFILE

This project investigates how Rubisco activase (Rca), a protein that uses energy from ATP to help plants grow, binds to molecules like ADP and ATP. Using computer simulations, researchers will explore the binding process and identify important amino acids involved in this function. Understanding Rca's workings could lead to better ways to improve plant growth and food production.

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 various cellular activities.

AAA+ proteins are a large group of proteins found in all living organisms. They play important roles in many cellular processes, such as DNA replication, protein folding, and organelle function. These proteins work by binding to and hydrolyzing ATP, which provides the energy needed for their activity.

ATPase

An enzyme that catalyzes the hydrolysis of ATP.

ATPases are enzymes that break down ATP (adenosine triphosphate), a molecule that stores energy in cells. This process releases energy that can be used to power various cellular functions, such as muscle contraction and protein synthesis.

Walker A and B motifs

Conserved amino acid sequences in ATPases that are essential for ATP binding and hydrolysis.

Walker A and B motifs are specific sequences of amino acids found within ATPase enzymes. These sequences are crucial for the enzyme's ability to bind and break down ATP, which is a vital energy source for cells.

Rubisco activase (Rca)

A protein that activates Rubisco enzyme in plants.

Rubisco activase (Rca) is a crucial protein found in photosynthetic organisms. It helps activate the Rubisco enzyme, which is responsible for fixing carbon dioxide during photosynthesis. Without Rca, the plant's ability to produce sugars would be significantly impaired.

ADP/ATP

Adenosine diphosphate and adenosine triphosphate, energy-carrying molecules in cells.

ADP/ATP represents two forms of a molecule called adenosine nucleotide. ATP is the energy currency of cells, while ADP is produced when ATP releases its energy for cellular processes. The interconversion between these two forms is essential for cellular energy metabolism.

Mg2+

A magnesium ion involved in various cellular processes.

Mg2+ is a positively charged ion of magnesium. It plays a crucial role in many biological processes, including enzyme function, DNA replication, and muscle contraction.