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Transcript
CELL TO CELL JUNCTIONS BY: ASHLEY COHN SURFACE MARKERS STRUCTURE FUNCTION EXAMPLE VARIABLE, INTEGRAL OR GLYCOLIPIDS IDENTIFY THE CELL MHC COMPLEXES, BLOOD GROUPS, ANTIBODIES IN PLASMA MEMBRANE. SEPTATE JUNCTIONS/ TIGHT JUNCTIONS STRUCTURE FUNCTION EXAMPLE TIGHTLY BONDED, LEAK PROOF, FIBROUS CLAUDIN PROTEIN THAT SEALS THE CELL HOLDS CELL TOGETHER SO THAT MATERIALS PASS THROUGH BUT NOT BETWEEN THE CELLS JUNCTIONS BETWEEN EPITHELIAL CELLS IN THE GUT ADHESIVE JUNCTION(DESMOSOME) STRUCTURE FUNCTION EXAMPLE VARIENT CADHERINS, DESMOCOLLINS, BIND TO INTERMEDIATE FILAMENTS OF CYTOSKELETON CREATES STRONG FLEXIBLE CONNECTIONS BETWEEN CELLS, FOUND IN VERTEBRATES EPITHELIUM • CADHERIN IS A PROTEIN WHICH IS A CA2+ DEPENDENT ADHESION MOLECULE WITH VERY WIDE POLYGENETIC DISTRIBUTION. • DESMOSOMES ARE A CADHERIN BASED JUNCTION UNIQUE TO VERTEBRATES. THEY CONTAIN THE CADHERIN'S DESMOCOLLIN. ADHESIVE JUNCTION ( ADHERENS JUNCTION) STRUCTURE FUNCTION EXAMPLE CLASSIC ADHERINS BIND TO MICROFILAMENTS OF CYTOSKELETONS CONNECTS CELLS TOGETHER, OLDEST FORM OF JUNCTION, FOUND IN ALL MULTICELLULAR ORGANISMS TISSUE WITH HIGH MECHANICAL STRESS SUCH AS THE SKIN ADHESIVE JUNCTION (HEMIDESMOSOMES, FOCAL ADHESION) STRUCTURE FUNCTION EXAMPLE INTEGRIN PROTEINS BINDS CELL TO EXTRACELLULAR MATRIX PROVIDE ATTACHMENT TO A SUBSTRATE INVOLVED IN CELL MOVEMENT AND IMPORTANT DURING DEVELOPMENT COMMUNICATING JUNCTION (GAP JUNCTION ) STRUCTURE FUNCTION EXAMPLE SIX TRANSMEMBRANE CONNEXON /PANNEXIN PROTEINS CREATING A PORE THAT CONNECTS CELLS ALLOWS FOR PASSAGE OF SMALL MOLECULES FROM CELLS TO CELL IN A TISSUE EXCITABLE TISSUE SUCH AS HEART MUSCLE •PANNEXINS ARE PROTEIN FOUND IN INVERTEBRATES •CONNEXONS ARE A PROTEIN IN VERTEBRATES COMMUNICATING JUNCTION ( PLASMODESMATA) STRUCTURE FUNCTION EXAMPLE CYTOPLASMIC CONNECTIONS BETWEEN GAPS IN CONJOINING PLANTS CELL WALLS COMMUNICATING JUNCTIONS BETWEEN PLANT CELLS PLANT TISSUE • PLASMODESMATA IS CYTOPLASMIC CONNECTIONS THAT FORM ACROSS THE TOUCHING PLASMA MEMBRANES ALL INFORMATION IN THIS POWER POINT CAN BE FOUND IN MGRAW TH HILL BIOLOGY 10 EDITION ON PAGES 83-85