Chapter 1 The structure and function of prokaryotes Special structure Pili and fimbriae Flagella The bacterial endospore
Special structure • Pili and fimbriae • Flagella • The bacterial endospore Chapter 1 The structure and function of prokaryotes
Pili and fimbriae G-", short, fine, hairlike appendages that are not involved in motility Fimbriae/fimbria: 1000piece/cell adhesion to host epithelium Sex pili/pilus: 1-10piece/cell, sexual conjugation, they are genetically determined by sex factors or conjugative plasmids and are required for bacterial mating. Receptors of some bacterial viruses
Pili and fimbriae G-, short, fine, hairlike appendages that are not involved in motility. Fimbriae/fimbria:1000piece/cell, adhesion to host epithelium Sex pili/pilus: 1-10piece/cell, sexual conjugation, they are genetically determined by sex factors or conjugative plasmids and are required for bacterial mating. Receptors of some bacterial viruses
Fimbriae and pilli Vinus covered pilus
Fimbriae and Pilli
FLAGELLA Some bacteria are motile Locomotory organelles-flagella Taste environment Respond to food/poison Chemotaxis Flagella embedded in cell membrane project as strand Flagellin(protein) subunits move cell by propeller like action
FLAGELLA • Some bacteria are motile • Locomotory organelles- flagella • Taste environment • Respond to food/poison – Chemotaxis – Flagella – embedded in cell membrane – project as strand – Flagellin (protein) subunits – move cell by propeller like action
The majority of motile prokaryotes move by means offlagella 4
The majority of motile prokaryotes move by means of flagella