Cell to cell junctions By: Ashley Cohn

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Cell to cell junctions By: Ashley Cohn




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Presentations text content in Cell to cell junctions By: Ashley Cohn

Slide1

Cell to cell junctions

By: Ashley Cohn

Slide2

Surface markers

Structure

Variable, integral or glycolipids

In plasma membrane.

Function

Identify the cell

Example

MHC complexes, blood groups, antibodies

Slide3

Septate junctions/ tight junctions

Structure

Tightly bonded, leak proof, fibrous

claudin

protein that seals the cell

Function

Holds cell together so that materials pass through but not between the cells

Example

Junctions between epithelial cells in the gut

Slide4

Adhesive junction(desmosome)

Structure

Varient

cadherins,

desmocollins, bind to intermediate filaments of cytoskeleton

Function

Creates strong flexible connections between cells, found in vertebrates

Example

Epithelium

Slide5

Cadherin is a protein which is a ca

2+

dependent adhesion molecule with very wide polygenetic distribution.

Desmosomes are a cadherin based junction unique to vertebrates. They contain the cadherin's desmocollin.

Slide6

Adhesive junction ( adherens junction)

Structure

Classic

adherins

bind to microfilaments of cytoskeletons

function

Connects cells together, oldest form of junction, found in all multicellular organisms

Example

tissue with high mechanical stress such as the skin

Slide7

Adhesive junction

(

hemidesmosomes

, focal adhesion)

Structure Integrin proteins binds cell to extracellular matrix

Function

Provide attachment to a substrate

Example

Involved in cell movement and important during development

Slide8

Communicating junction (gap junction )

Structure

six transmembrane

connexon

/pannexin

proteins creating a pore that connects cells

Function

Allows for passage of small molecules from cells to cell in a tissue

Example

Excitable tissue such as heart muscle

Slide9

Pannexins

are protein found in invertebrates

Connexons

are a protein in vertebrates

Slide10

Communicating junction ( plasmodesmata

)

Structure

Cytoplasmic connections between gaps in conjoining plants cell walls

Function

Communicating junctions between plant cells

Example

Plant tissue

Slide11

Plasmodesmata

is cytoplasmic connections that form across the touching plasma membranes

Slide12

All information in this power point can be found in

Mgraw

hill biology 10th edition on pages 83-85

Slide13

Slide14


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