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Plasma Membrane in Bacteria and Archaea01:27

Plasma Membrane in Bacteria and Archaea

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The plasma membrane is an essential cellular structure responsible for maintaining cellular integrity and regulating the selective transport of molecules. While bacteria and archaea share the fundamental function of plasma membranes, their structural and molecular differences reflect adaptations to distinct ecological and physiological challenges.Bacterial Plasma MembranesBacterial plasma membranes are predominantly composed of phospholipids with fatty acid chains ester-linked to a glycerol...
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Blood plasma is a fluid that contains approximately 92% water and 8% solutes. The solutes include various types of proteins, which constitute about 7% of the total solutes in the plasma. The high-molecular-weight proteins—albumins, globulins, and fibrinogen—are essential to plasma function. Albumins, making up about 60% of the plasma proteins, maintain the osmotic balance within blood vessels by preventing excessive water leakage. Additionally, albumins serve as carrier proteins,...
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meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

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All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
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Enlargement of the Plasma Membrane01:22

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Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Predator-Prey Interactions02:39

Predator-Prey Interactions

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Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
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Related Experiment Video

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A Novel In vitro Model for Studying the Interactions Between Human Whole Blood and Endothelium
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Interaction between Serratia protease and human plasma alpha 2 macroglobulin.

K Miyata, M Nakamura, K Tomoda

    Journal of Biochemistry
    |April 1, 1981
    PubMed
    Summary

    Serratia protease (TSP) binds to alpha-2 macroglobulin (α2M), altering its enzymatic activity and causing structural changes. This interaction is key to understanding protease regulation within biological systems.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Proteomics

    Background:

    • Alpha-2 macroglobulin (α2M) is a large plasma proteinase inhibitor.
    • Serratia protease (TSP) is a bacterial metalloproteinase.
    • Understanding protease-inhibitor interactions is crucial for biological regulation.

    Purpose of the Study:

    • To investigate the stoichiometric binding of Serratia protease (TSP) to alpha-2 macroglobulin (α2M).
    • To characterize the effect of TSP binding on α2M structure and TSP enzymatic activity.
    • To elucidate the mechanism of α2M cleavage by TSP.

    Main Methods:

    • Purification and crystallization of human plasma alpha-2 macroglobulin (α2M).
    • Stoichiometric binding assays between TSP and α2M.
    • Enzymatic activity assays of bound TSP using substrate kinetics (Km and Vmax).

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  • Analysis of α2M structural changes upon complex formation.

    • Main Results:

    • TSP bound stoichiometrically to purified α2M, but not to apo TSP.
    • Formation of the TSP-α2M complex altered TSP enzymatic activity: Km values remained unchanged, while Vmax values decreased.
    • TSP cleaved α2M at the mid-region of its subunits, inducing a conformational change in the α2M molecule.

    Conclusions:

    • Serratia protease (TSP) forms a stoichiometric complex with alpha-2 macroglobulin (α2M).
    • Binding to α2M modulates TSP's enzymatic activity, specifically reducing its catalytic efficiency (Vmax).
    • TSP induces significant conformational changes in α2M through cleavage, highlighting a mechanism of protease regulation.