RESEARCH: AAA-PROTEIN-SUPERFAMILY
FOLDING PROJECT #19321 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. Researchers will use computer simulations to understand how Rca binds to ATP and ADP, and which parts of the protein are most important for this process.

Note: This TLDR is a simplication and may not be 100% accurate.

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.

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AAA+ protein superfamily

A group of proteins with a common domain involved in ATP-dependent processes.

AAA+ proteins are a large family of proteins found in all living organisms. They are characterized by a specific domain that binds and hydrolyzes ATP, providing energy for various cellular functions. These proteins play essential roles in processes like DNA replication, protein folding, and cell division.

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ATPases

Enzymes that hydrolyze ATP to ADP, releasing energy for cellular processes.

ATPases are enzymes responsible for breaking down adenosine triphosphate (ATP) into adenosine diphosphate (ADP), releasing energy in the process. This energy is used to power various cellular activities, such as muscle contraction, nerve impulse transmission, and protein synthesis.

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AAA+ domain

A conserved protein domain found in AAA+ proteins, involved in ATP binding and hydrolysis.

The AAA+ domain is a specific region within proteins that belongs to the AAA+ superfamily. It plays a crucial role in binding and hydrolyzing ATP, providing the energy required for various cellular functions.

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Walker A and B motifs

Structural motifs within the AAA+ domain involved in ATP binding and hydrolysis.

Walker A and B motifs are specific sequences of amino acids within the AAA+ domain. These motifs act as binding sites for ATP and play a crucial role in facilitating its hydrolysis, releasing energy for cellular processes.

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Rubisco activase (Rca)

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

Rubisco activase (Rca) is a protein essential for photosynthesis. It plays a crucial role in activating Rubisco, the enzyme that catalyzes carbon fixation, converting atmospheric carbon dioxide into organic compounds.

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ADP/ATP

Adenosine diphosphate and adenosine triphosphate, the primary energy currency of cells.

ADP/ATP refers to adenosine diphosphate and adenosine triphosphate. These molecules play a central role in cellular energy metabolism. ATP stores energy released during catabolic processes, while ADP represents the dephosphorylated form used for energy-requiring reactions.

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Mg2+

A magnesium ion essential for many enzymatic reactions.

Mg2+ is a positively charged magnesium ion that plays a crucial role in various biological processes. It acts as a cofactor for numerous enzymes involved in metabolic reactions, DNA replication, and protein synthesis.