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MAJOR HISTOCOMPATIBILITY COMPLEX
(MHC)
By; Omer ASLANKAN
INTRODUCTİON
• Major Histocompactibility complex (MHC) is set of
surface proteins located on the cell membrane of
nucleated cells.
• It plays more important work to indentify the antigen
between self and non self body, intracellular
recognization and responsible for antigen presentation.
• Histo refers to tissues. Compatibility refers to living
together harmoniously.
• MHC molecules always recognize only T lymphocytes.
• The two types of MHC are worked in immunity.
• T helper (Th) cell recognized by MHC molecules II.
• T cytotoxic (Tc) cells are recognized by MHC I
molecules.
ANTIGEN-PRESENTING CELLS
CLASS I MHC MOLECULES
• Class I MHC molecule are a group of major histocompactibility
antigen.
• They are present on the surface of all nucleated cells except
nervous tissue and platelets.
• It present antigen to Tc cells.
• It bind with CD-8 adhesion molecules of Te cells.
• It brings about cell mediated immune response.
• It found on all nucleated cells.
STRUCTURE OF CLASS I MHC MOLECULE
• It consists two polypeptide chains namely a chain and B2 - micro globulin.
• a chain which is non covalently attached with B2 microglobuline .
• a chain contain a transmembrane glycoprotein which is encoded by A,B and C gene of
grouped HLA. (Human leukocyte antigens (HLA; are proteins—or markers—on most cells in body)
• a chain is organized by three domains such as a 1, a 2 and a 3 each domain containing
90 amino acids sequences .
• B2 microglobuline is similar in size of a 3 and it dose not contain trans membrane
proteins .
• When the antigen is internalized and processed inside by proteosome (Ubiquitin,
cytosolic degradation), the peptides are produced .
• Peptide is further loaded on the groove of MHC I molecules from endoplasmicreticulum.
CLASS II MHC MOLECULE
• Class II MHC molecule are present on the surface of antigen
presenting cell and cell which engulfed the foreign antigen.
• It binds with the exogenous(endocytic degradation ) antigens.
• It binds with CD4 adhesion molecules Th cells.
• It also consist of two polypeptide chains namely a chain and B
chain.
• Antigen is processed inside the endosome and peptide is further
loaded on groove of MHC II molecules.
• It found only on APCs
STRUCTURE OF MHC II MOLECULE
• The class II MHC Molecule consists of two polypeptide chain
namely a chain and B chain.
• The both chain are attached noncovelantly.
• Each chain contains two units.
• The two units of a chain are called al and a2.
• The two domains of B chains are called B1 and B2.
• B2 and a2 are transmembrane domains anchoring the MHC to
plasma membrane.
• The al and B1 domains jointly bear a peptide binding groove.
MHC ASSOCIATED GENES
FUNCTION OF MHC MOLECULES
• MHC molecules are loaded with a bit of sample peptide fragment
derived from the degradation of proteins present inside the cell. This
peptide is the mirror image of proteins present inside the cell.
• MHC molecules contain self as well as nonself (foreign) antigen.
• They bring about defense against infections and diseases.
• They mediate certain autoimmune diseases.
• They are responsible for individual smell of people.
DIFFERENCES BETWEEN MHC CLASS I & CLASS II
SIMILARITIES BETWEEN MHC CLASS I & MHC CLASS II
REFERENCES
• https://www.ncbi.nlm.nih.gov/books/NBK546662/#:~:text=Human%
20leukocyte%20antigens%20(HLA)%20are,can%20also%20have%20
detrimental%20effects.
• https://youtu.be/t81EjpkCiss
• https://quizlet.com/3489839/mhc-i-and-ii-flash-cards/
• https://www.slideshare.net/Prasannjeetsaha/major-histocompatibility-
complex-78885656
• https://www.slideshare.net/AbhijitDebnath143/structure-and-function-
of-mhc
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MHC.pptx

  • 2. INTRODUCTİON • Major Histocompactibility complex (MHC) is set of surface proteins located on the cell membrane of nucleated cells. • It plays more important work to indentify the antigen between self and non self body, intracellular recognization and responsible for antigen presentation. • Histo refers to tissues. Compatibility refers to living together harmoniously. • MHC molecules always recognize only T lymphocytes. • The two types of MHC are worked in immunity. • T helper (Th) cell recognized by MHC molecules II. • T cytotoxic (Tc) cells are recognized by MHC I molecules.
  • 4. CLASS I MHC MOLECULES • Class I MHC molecule are a group of major histocompactibility antigen. • They are present on the surface of all nucleated cells except nervous tissue and platelets. • It present antigen to Tc cells. • It bind with CD-8 adhesion molecules of Te cells. • It brings about cell mediated immune response. • It found on all nucleated cells.
  • 5. STRUCTURE OF CLASS I MHC MOLECULE • It consists two polypeptide chains namely a chain and B2 - micro globulin. • a chain which is non covalently attached with B2 microglobuline . • a chain contain a transmembrane glycoprotein which is encoded by A,B and C gene of grouped HLA. (Human leukocyte antigens (HLA; are proteins—or markers—on most cells in body) • a chain is organized by three domains such as a 1, a 2 and a 3 each domain containing 90 amino acids sequences . • B2 microglobuline is similar in size of a 3 and it dose not contain trans membrane proteins . • When the antigen is internalized and processed inside by proteosome (Ubiquitin, cytosolic degradation), the peptides are produced . • Peptide is further loaded on the groove of MHC I molecules from endoplasmicreticulum.
  • 6. CLASS II MHC MOLECULE • Class II MHC molecule are present on the surface of antigen presenting cell and cell which engulfed the foreign antigen. • It binds with the exogenous(endocytic degradation ) antigens. • It binds with CD4 adhesion molecules Th cells. • It also consist of two polypeptide chains namely a chain and B chain. • Antigen is processed inside the endosome and peptide is further loaded on groove of MHC II molecules. • It found only on APCs
  • 7. STRUCTURE OF MHC II MOLECULE • The class II MHC Molecule consists of two polypeptide chain namely a chain and B chain. • The both chain are attached noncovelantly. • Each chain contains two units. • The two units of a chain are called al and a2. • The two domains of B chains are called B1 and B2. • B2 and a2 are transmembrane domains anchoring the MHC to plasma membrane. • The al and B1 domains jointly bear a peptide binding groove.
  • 9. FUNCTION OF MHC MOLECULES • MHC molecules are loaded with a bit of sample peptide fragment derived from the degradation of proteins present inside the cell. This peptide is the mirror image of proteins present inside the cell. • MHC molecules contain self as well as nonself (foreign) antigen. • They bring about defense against infections and diseases. • They mediate certain autoimmune diseases. • They are responsible for individual smell of people.
  • 10. DIFFERENCES BETWEEN MHC CLASS I & CLASS II
  • 11. SIMILARITIES BETWEEN MHC CLASS I & MHC CLASS II
  • 12. REFERENCES • https://www.ncbi.nlm.nih.gov/books/NBK546662/#:~:text=Human% 20leukocyte%20antigens%20(HLA)%20are,can%20also%20have%20 detrimental%20effects. • https://youtu.be/t81EjpkCiss • https://quizlet.com/3489839/mhc-i-and-ii-flash-cards/ • https://www.slideshare.net/Prasannjeetsaha/major-histocompatibility- complex-78885656 • https://www.slideshare.net/AbhijitDebnath143/structure-and-function- of-mhc