bacteriophage

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BACTERIOPHAGE:

BACTERIOPHAGE Dr.Abhijit Gogoi UNIVERSITY OF FIJI

bacteriophage----------------:

bacteriophage----------------

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Bacteriophages ( phages ) are obligate intracellular parasites that multiply inside bacteria by making use of some or all of the host biosynthetic machinery . They are viruses that infect bacteria.

Composition of Bacteriophage :

Composition of Bacteriophage Nucleic acid: either DNA or RNA but not both ds DNA, ss RNA, ss DNA unusual or modified bases encode 3-5 gene products to over 100 gene products Protein: function in infection and protect the nucleic acid

Structure of Bacteriophage :

Structure of Bacteriophage different sizes and shapes icosahedral 二十面体 filamentous

Types of Bacteriophage:

Types of Bacteriophage Lytic or Virulent Phage Lysogenic or Temperate Phage

Lytic or Virulent Phages:

Lytic or Virulent Phages Definition: Lytic or virulent phages are phages which can only multiply in bacteria and kill the cell by lysis at the end of the life cycle.

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Life Cycle Adsorption Penetration Biological Synthesis Maturation and Release

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Adsorption

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Penetration

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Biological Synthesis

PowerPoint Presentation:

Maturation and Release

lysogenic conversion :

When a cell becomes lysogenized, occasionally extra genes carried by the phage get expressed in the cell. These genes can change the properties of the bacterial cell. This process is called lysogenic conversion. lysogenic conversion

Application of Bacteriophage :

Application of Bacteriophage Used in treatment of bacterial infections Used for the identification of pathogenic bacteria (phage typing Used in molecular biology

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