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The periplasmic space is the area between the cell wall and the plasma membrane. It is present in Gram-positive and Gram-negative bacteria, as well as in yeasts. This region contains proteins that are secreted from the cytoplasm but cannot cross the cell wall or outer membrane. The periplasm is important for protein transport and quality control, enzyme facilitation, and structural support for the cell. It also houses motility organelles such as the flagellum and contains a high concentration of proteins and peptidoglycan. The periplasmic space is an oxidizing environment, in contrast to the reducing environment of the cytoplasm, and it is involved in a variety of functions that contribute to the success of bacteria in colonizing different environments.
| Characteristics | Values |
|---|---|
| Location | Between the inner and outer membranes of the cell |
| Composition | Aqueous environment with a high concentration of proteins and peptidoglycan |
| Function | Provides structural support, aids in protein transport and quality control, facilitates electron transfer, and houses motility organelles |
| Volume | 7-40% of the total volume of diderm bacteria |
| Width | 13-25 nm |
| Environment | Oxidizing, in contrast to the reducing environment of the cytoplasm |
| Protein Functions | Enzyme activation, electron transfer, nutrient binding, transport, folding, degradation, substrate hydrolysis, and xenobiotic metabolism |
| Enzymes | Alkaline phosphatases, cyclic nucleotide phosphodiesterases, acid phosphatases, 5’-nucleotidases, and invertase |
| Importance | Critical for sensing outer membrane damage and controlling motility |
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What You'll Learn
Periplasmic space in Gram-negative bacteria
Gram-negative bacteria are surrounded by two membrane bilayers separated by a space called the periplasm. This space is also referred to as the periplasmic space or periplasmic compartment. The periplasm is a concentrated gel-like matrix that occupies 7% to 40% of the total volume of diderm bacteria, constituting up to 30% of cellular proteins. It is a highly metabolically active compartment, distinct from the cytoplasm, with an oxidizing environment that facilitates the more efficient and diverse oxidation, folding, and quality control of proteins.
The periplasm contains peptidoglycan and a variety of functional proteins, including disulfide oxidoreductases, peptidyl-prolyl isomerases, chaperones, and proteases involved in protein folding and degradation. It also houses motility organelles such as the flagellum, which spans both membranes enclosing the periplasm. The size of the periplasm is critical for sensing outer membrane damage and controlling motility.
The periplasmic space in Gram-negative bacteria plays a significant role in cell signaling, with receptors that function as sensor kinases to detect specific molecules or damage. It is also involved in the uptake of nutrients, such as sugars, amino acids, and vitamins, through solute-binding proteins. Additionally, the periplasm contains virulence-associated proteins, making it a potential target for antimicrobial therapies.
The periplasmic space is deeply interconnected with the pathogenesis of diseases in the setting of microbial infections. Its compartmentalization allows for the separation of enzymes that could be toxic if present in the cytoplasm. Furthermore, the periplasm provides structural support to the cell, aiding in withstanding turgor pressure. The presence of both inner and outer membranes in Gram-negative bacteria defines the periplasmic space, distinguishing them from Gram-positive bacteria, which have a much smaller periplasmic space.
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Periplasmic space in Gram-positive bacteria
The periplasmic space is the compartment between the inner and outer membranes of the bacterial cell. In Gram-negative bacteria, the periplasmic space is located between the inner and outer membranes of the cell. In contrast, in Gram-positive bacteria, the periplasmic space is the gap between the cell wall and the plasma membrane.
Gram-positive bacteria are bounded by a single membrane and lack an outer lipid membrane. The periplasmic space in Gram-positive bacteria is much smaller than in Gram-negative bacteria, constituting a much smaller percentage of the total cell volume. The periplasm in Gram-positive bacteria is enclosed by the cytoplasmic membrane and the peptidoglycan layer beneath, rather than two membranes as in Gram-negative bacteria.
The periplasmic space in Gram-positive bacteria serves important functions, including protein transport and quality control, similar to the endoplasmic reticulum in eukaryotes. It also allows for the compartmentalization of enzymes that could be toxic to the cytoplasm. Additionally, the periplasm in Gram-positive bacteria may contain structural elements and environmental sensing modules, contributing to the overall functioning of the cell.
The periplasmic space in Gram-positive bacteria is also referred to as the inner-wall zone (IWZ). It serves as the first destination for proteins being transported across the bacterial cell wall. The periplasm in Gram-positive bacteria contains a thin cell wall composed of peptidoglycan, which provides structural support and aids in withstanding turgor pressure.
The presence of a periplasmic space in Gram-positive bacteria highlights the importance of this region for vital processes, despite the absence of an additional membrane. The existence of this space contributes to our understanding of the differences between Gram-positive and Gram-negative bacteria, providing insights into their distinct characteristics and behaviors.
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Periplasmic space and protein transport
The periplasmic space is the region between the cytoplasmic and outer membranes of Gram-negative bacteria. It is a highly metabolically active compartment, housing many important proteins and enzymes. The periplasm is an aqueous environment with a high concentration of proteins and peptidoglycan, giving it a gel-like consistency.
Gram-negative bacteria have two membranes, with the periplasmic space located between them. In contrast, Gram-positive bacteria typically have a single membrane and lack an outer lipid membrane. However, recent research has revealed that a much smaller periplasmic space is also present in Gram-positive bacteria, located between the cell wall and the plasma membrane.
The periplasmic space is essential for various cellular processes, including protein transport and quality control. It serves as the first destination for proteins being transported across the bacterial cell wall. The periplasm contains a variety of functional categories of proteins, including those involved in nutrient binding and transport, protein folding and degradation, and electron transport.
Periplasmic proteins play a crucial role in the functionality of the periplasmic space. They act as catalysts, transporters, and structural components, facilitating numerous cellular activities. One important class of periplasmic proteins is the binding proteins, which actively transport nutrients into the cell. These proteins exhibit high-affinity binding, ensuring efficient nutrient uptake even in scarce environments.
The compartmentalization of the periplasmic space is vital for the proper functioning of enzymes that could be toxic if present in the cytoplasm. This separation allows for the safe compartmentalization of degradative enzymes, such as ribonuclease and alkaline phosphatase, which would destroy essential components of the cytosol if they existed in the cytoplasm.
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Periplasmic space and bacterial adaptation
The periplasmic space is the compartment between the inner and outer membranes of the bacterial cell. In Gram-positive bacteria, it is the gap between the cell membrane and the cell wall, whereas, in Gram-negative bacteria, it is the space between the cell membrane and the outer membrane. This space is also referred to as the periplasm, which is an aqueous environment containing a high concentration of proteins and peptidoglycan, forming a gel-like matrix. The periplasm constitutes a significant portion of the total cell volume, ranging from 7% to 40% in diderm bacteria, but is much smaller in Gram-positive bacteria.
The periplasmic space serves several important functions. It houses motility organelles such as the flagellum, which spans the periplasmic space and is essential for bacterial motility. The periplasm also plays a crucial role in protein transport and quality control, similar to the endoplasmic reticulum in eukaryotes. Additionally, it allows for the compartmentalization of enzymes that could be toxic if present in the cytoplasm. The periplasm is involved in nutrient binding, transport, folding, degradation, substrate hydrolysis, and xenobiotic metabolism. It contains enzymes such as alkaline phosphatases, cyclic nucleotide phosphodiesterases, acid phosphatases, and 5’-nucleotidases, which facilitate protein folding and other essential processes.
The periplasmic space is also crucial for bacterial adaptation and survival in various environments. The presence of respiratory electron-transfer proteins in the periplasm enables bacteria to colonize a wide range of oxic and anoxic environments. These redox proteins facilitate electron transfer between different electron donors and acceptors, contributing to the success of bacteria in diverse ecological niches. Additionally, the periplasm contains enzymes involved in peptidoglycan biosynthesis, which is essential for the structural integrity of the bacterial cell wall.
Studies have investigated the adaptation of the periplasm to maintain spatial constraints and its impact on cell envelope processes and viability. For example, research on the elongated version of the periplasmic protein Lpp (Lpp+21) in E. coli revealed that bacteria can accommodate this change through compensatory mechanisms. This highlights the importance of periplasmic organization for cell viability and the resilience of the underlying systems. Furthermore, the periplasm mediates the uptake of DNA in several strains of transformable bacteria, showcasing its role in bacterial adaptation and genetic variation.
In summary, the periplasmic space is a highly dynamic and functional compartment in bacterial cells. Its presence allows bacteria to adapt to different environments, perform essential biochemical processes, and maintain cell viability. The periplasm's role in protein transport, enzyme compartmentalization, and electron transfer underscores its significance in bacterial physiology and adaptation. Further research into the periplasmic space will undoubtedly lead to more insights into bacterial behaviour and potential therapeutic targets to combat bacterial infections.
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Periplasmic space and protein folding
The periplasmic space is the region between the inner and outer membranes of Gram-negative bacteria, constituting up to 40% of the total cell volume. In Gram-positive bacteria, this space is much smaller and found between the cell wall and the plasma membrane. The periplasm is an oxidising environment, in contrast to the reducing environment of the cytoplasm, and contains a high concentration of proteins and peptidoglycan, forming a gel-like matrix.
The periplasm is involved in a variety of functions, including protein transport, quality control, nutrient binding, substrate hydrolysis, and xenobiotic metabolism. Importantly, the periplasm also contains enzymes that facilitate protein folding. These enzymes, known as foldases, play a central role in protein assembly and transport, as well as cellular adaptation. Despite the importance of protein folding in the periplasmic space, the mechanism has not been extensively studied, and there is limited information on the detailed kinetics of folding in this environment.
In Escherichia coli, or E. coli, the periplasmic proteins are stable and resistant to denaturation, with a significant proportion acting as chaperones to facilitate protein folding and resist denaturation. Periplasmic folding catalysts, such as chaperones SurA and Skp, participate in rate-limiting steps of protein folding, ensuring the correct assembly of proteins containing disulfide bonds. Additionally, the periplasm contains signal transduction pathways that regulate the functioning of the protein folding and transport machinery.
The periplasmic space in Gram-negative bacteria also contains respiratory electron-transfer proteins, contributing to the success of bacteria in colonizing diverse environments. These redox proteins facilitate electron transfer between a range of electron donors and acceptors, enhancing the respiratory diversity of bacteria. This allows bacteria to thrive in both oxic and anoxic environments and play a critical role in biogeochemical element cycles, such as the nitrogen, sulfur, and carbon cycles.
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Frequently asked questions
The periplasmic space is the area between the inner and outer membranes of the cell. It is also referred to as the periplasm.
The periplasmic space has several functions, including protein transport, quality control, and the compartmentalization of enzymes that would be toxic if they were in the cytoplasm. The periplasm also contains structural elements and important environmental sensing modules, and it allows complex nanomachines to span the cell envelope.
The periplasmic space is an aqueous environment containing a high concentration of proteins and peptidoglycan, which forms a gel-like matrix.
Gram-negative bacteria, diderm bacteria, and monoderm bacteria all have a periplasmic space. Gram-positive bacteria have a much smaller periplasmic space.
