Describe the mechanism of the classical complement pathway and discuss the critical role that the split products of C3 and other complement proteins play in the elimination of bacteria.
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Proteins
We generally tend to think of proteins only from a dietary lens, as a component of what we eat. However, they are among the most important and abundant organic macromolecules in the human body, with diverse structures and functions. Every cell contains thousands and thousands of proteins, each with specific functions. Some help in the formation of cellular membrane or walls, some help the cell to move, others act as messages or signals and flow seamlessly from one cell to another, carrying information.
Protein Expression
The method by which living organisms synthesize proteins and further modify and regulate them is called protein expression. Protein expression plays a significant role in several types of research and is highly utilized in molecular biology, biochemistry, and protein research laboratories.
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- Outline and describe the steps of Classical pathway of complement activation; from initiation to cell lysis. Then describe both the Alternative and Lectin pathways, indicating how they compare and how they differ from the classical pathway.Which of the following is true about complement? Check all that apply. Three pathways of complement, where classical and alternative, are activated by antibodies and lectin by spontaneous hydrolysis of C3 Complement pathways are activated in response to infections and involved in opsonization, phagocytosis and lysis of microbes The"b" subunit of complement such as C3b or C5b is deposited on the microbes, whereas the "a" subunit, C3a or C5a recruits phagocytic cells to the site of infection and promotes inflammation Alternative pathway is activated immediately due to presence of C3b because of spontaneous hydrolysis of C3, whereas classical pathways in several days after secretion of pathogen-specific antibodies Seven complement(C) proteins are made by liver and C5 is found in abundanceSplitting the complement protein (C3) into C3a and C3b as a result of contact with the Fc region of antibodies coating a bacterium illustrates the onset of which of the following ? Choose from the following: (A) classical pathway of complement activation (B) alternate pathway of complement activation
- Describe briefly the three effector functions of complement activation that result from the initial event of complement protein binding to peptidoglycans or LPSExplain the mechanism underlying the molecular structure of C7, C8, and C9 complement protein that facilitates their insertion into the cell membrane of a pathogen?42. Answer (a) for TRUE or (b) for C3a and C5b are anaphylatoxins. 43. Answer (a) for TRUE or (b) for FALSE to the following statement: on C3 and C5 convertases are generated from all complement pathways. 44. Answer (a) for TRUE or (b) for FALSE to the following statement: While the Clq protein starts the classical pathway, the complement MBL protein starts the pathway. 45. Answer (a) for TRUE or (b) for FALSE to the following statement MHC-II can present to CD8+ T cells and can be loaded with 13 amino acids 46. Regarding the figure below, choose (a) for tissue rejection or (b) for NO tissue rejection: Recipient haplotype Donor haplotype Host B Host AxB C 244
- During inflammaion, host tissue may be damaged owing to the release of toxic oxygen derivatives produced by activated phagocytes. List some of hese toxic species and explain what cellular/biochemical mechanisms limit these damaging off-target effects.The terminal complement proteins polymerize to form pores in membranes that can kill certain pathogens. The terminal components of the complement pathway assemble to form a membrane attack complex that can induce pathogen lysis and death. Yet, evidence indicates that this feature of complement is less important than the earlier steps that promote pathogen opsonization and induce inflammation. This conclusion is based on: In vitro experiments showing that very few species of bacteria are susceptible to lysis by the membrane attack complex Experiments indicating that only bacteria, but not viruses or fungi, are susceptible to lysis by the membrane attack complex The very low levels of terminal complement components in the serum The fact that other mammalian species lack the terminal components of the complement pathway needed to form the membrane attack complex The limited susceptibility to infections of patients with deficiencies in terminal complement componentsExplain the multifaceted role of interferons as first responders to viral infection: Identify important target ISGs. Discuss the general mechanisms by which interferon induced genes block virus replication.
- Complement is an integral part of the innate immune response to bacteria . One of its mechanisms of action is to behave as an anaphylatoxin Describe the anaphylatoxic effects of complement identifying which components are activated.Mannose binding lectins (MBL) and ficolins are the two classes of proteins that can initiate the lectin pathway of complement activation. These proteins are selective for activating complement on the surfaces of microbial pathogens rather than host cells because: Their higher-order oligomeric structure can be assembled only after the monomers first bind to pathogen membranes. They only recruit MASP (MBL-associated serine proteases) proteins when bound to pathogen surfaces and not when bound to host cells. They only undergo the conformational change needed to activate MASP proteins when bound to a pathogen and not when bound to a host cell. They only bind to carbohydrate side chains and oligosaccharide modifications found on pathogen surfaces but not on host cell membranes. The activated MASP proteins are rapidly inactivated by hydrolysis when present on the surface of a host cell.Complement activation is a cascade reaction, with each component sequentiallyacting on others, in a similar way to the blood-clotting system. Discuss the effectsthat occur when peptides are generated from the activation by either the classicalor the alternative pathway. This is an immunology question