Related Experiment Video
Updated: Feb 6, 2026
09:51
Author Spotlight: A Selective Luciferase-Based Assay for Monitoring ATG4B 27 Activity in Cells
Published on: June 30, 2023
1.5K
Type I signal peptidase: an overview
1International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi 110067, India. renu@icgeb.res.in
Archives of Biochemistry and Biophysics
|August 30, 2005
Summary
Signal peptidases are crucial enzymes that cleave targeting sequences on proteins destined for membranes. This review focuses on bacterial type I signal peptidases, detailing their unique catalytic mechanisms and substrate recognition.
Area of Science:
- Biochemistry
- Molecular Biology
- Microbiology
Background:
- The signal hypothesis posits that protein sequences direct proteins to membranes.
- Signal peptidases remove these targeting sequences, with types I, II, and IV identified.
- Type I signal peptidases are essential serine proteases involved in protein translocation.
Purpose of the Study:
- To provide an overview of bacterial type I signal peptidases.
- To detail the properties of these enzymes.
Main Methods:
- Review of existing literature on type I signal peptidases.
- Analysis of enzyme properties, including catalytic mechanisms and substrate specificity.
Main Results:
- Type I signal peptidases utilize a Ser-Lys or Ser-His catalytic dyad.
- They recognize signal sequences with high fidelity, often featuring an 'Ala-X-Ala' motif.
- These enzymes are conserved across bacteria, archaea, fungi, plants, and animals.
Conclusions:
- Bacterial type I signal peptidases are vital for protein secretion and membrane targeting.
- Their unique catalytic machinery and recognition mechanisms warrant further investigation.
Related Concept Videos
01:32Types of Signaling Molecules
13.2K
In multicellular organisms, many molecules transmit signals between cells to pass information. These signals vary in complexity and include small peptides, nucleotides, steroids, fatty acid derivatives, and dissolved gases such as nitric oxide. Some signaling molecules diffuse through the plasma membrane to act locally between neighboring cells or travel long distances. Others remain attached to the cell surface, transmitting information to other cells only when they make contact. In some...
13.2K
01:23Overview of Cell Signaling
24.9K
Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
Cells respond to many types of information, often through receptor proteins positioned on the membrane. For example, skin cells respond to and transmit touch...
Cells respond to many types of information, often through receptor proteins positioned on the membrane. For example, skin cells respond to and transmit touch...
24.9K
01:26Signal Transduction: Overview
11.6K
Cells respond to many types of information, often through receptor proteins positioned on the membrane. They respond to chemical signals, such as hormones, neurotransmitters, and other signaling molecules, initiating a series of molecular reactions to produce an appropriate response. This is called signal transduction. Cells also coordinate different responses elicited by the same signaling molecule via mediators, allowing molecular cross-talk.
Typically, signal transduction involves three...
Typically, signal transduction involves three...
11.6K
00:58¹H NMR Signal Integration: Overview
3.6K
The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
3.6K
01:23Dipeptidyl Peptidase 4 Inhibitors
679
Dipeptidyl peptidase 4 (DPP-4) is a serine protease widely distributed in the body. It's involved in the inactivation of GLP-1 and GIP hormones, which are crucial for insulin regulation. DPP-4 inhibitors, such as sitagliptin (Januvia), saxagliptin (Onglyza), linagliptin (Tradjenta), alogliptin (Nesina), and vildagliptin (Galvus), help increase the proportion of active GLP-1, enhancing insulin secretion. These inhibitors work by competitively binding to DPP-4. This binding causes a...
679
01:22Diabetes Mellitus: Overview and Type I Subtype
5.4K
Diabetes mellitus is a chronic metabolic disorder characterized by high blood glucose levels due to inadequate insulin production, insulin resistance, or both. The condition affects millions worldwide and can significantly impact their health and quality of life.
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...
Type 1 diabetes is an autoimmune disease in which the immune system mistakenly attacks and destroys the insulin-producing beta cells in the pancreas. As a result, the body is unable to produce sufficient insulin, and individuals with...
5.4K