Related Experiment Video
Updated: Jul 19, 2026
07:38
Measuring In Vitro ATPase Activity for Enzymatic Characterization
Published on: August 23, 2016
ATP-dependent proteases of bacteria: recognition logic and operating principles
Tania A Baker1, Robert T Sauer
1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. tabaker@mit.edu
Trends in Biochemical Sciences
|November 1, 2006
Summary
ATP-powered AAA+ proteases are molecular machines that select and degrade specific proteins. Recent studies reveal substrate recognition motifs, adaptor protein roles, and the ATPase cycle
Area of Science:
- Biochemistry
- Molecular Biology
- Proteomics
Background:
- ATP-powered AAA+ proteases degrade specific proteins within complex cellular environments.
- These enzymes function as molecular machines, unfolding native proteins prior to degradation.
- Understanding substrate selection is crucial for elucidating their biological roles.
Purpose of the Study:
- To review recent advances in understanding ATP-powered AAA+ protease substrate recognition and degradation mechanisms.
- To highlight the role of proteomic approaches and adaptor proteins in enzyme regulation.
- To summarize current knowledge on the ATPase cycle and its link to protein unfolding.
Main Methods:
- Proteomic approaches for substrate identification.
- Biochemical dissection of ATPase cycles.
- Analysis of sequence motifs for protein recognition.
- Investigation of adaptor protein function.
Main Results:
- Numerous substrates and recognition motifs identified for bacterial AAA+ proteases.
- Adaptor proteins shown to regulate substrate choice.
- Fundamental operating principles of the ATPase cycle and protein unfolding elucidated.
Conclusions:
- Recent advances have significantly improved our understanding of AAA+ protease substrate selection and degradation.
- These enzymes are versatile molecular machines with complex regulatory mechanisms.
- Further research promises deeper insights into their ubiquitous biological functions.
Related Concept Videos
01:17The Proteasome Structure
The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...
The proteasome is an...
01:18ATP Synthase: Structure
ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
01:13The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
02:18The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
02:18The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
01:19Allosteric Proteins-ATCase
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis pathway,...