وظائف بروتينات الفيروس Functions of Viral Proteins

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Presentation transcript:

وظائف بروتينات الفيروس Functions of Viral Proteins - I حماية الجينوم الفيروسي Protection of Viral genome - تجمع الغطاء الخارجي - تميزمتخصص لتعليب الحامض النووي - تفاعل مع الغشاء الخلوي للعائل لتكوين غلاف فيروسي

- II نقل الجنيوم الفيروسي Delivery of the genome - الأرتباط بالمستقبلات Receptors - أرسال إِشارات خاصة تحفز التقشر - الإندماج مع الغشاء الخلوي للعائل - التفاعل مع مركبات داخل الخلية

- IIIتفاعلات أخرى مع العائل Other interactions with host - التفاعل مع مناعة الجسم العائل - التفاعل مع مركبات الخلية العائل لنقل إلى مواقع داخلية للتجمع - انزيمات حيوية : Hemagglutination HA RBC - انزيمات مهمه في التكاثر RNA - dependent - DNA - polymerase (RT) Retrovirus RNA - dependent - RNA Polymerase RNA virus DNA - dependent - RNA Polymerase DNA virus النسخ Transcription تحلل Hemagglutination

خطوات دورة تكاثر الفيروس Steps in Replication cycle of virus .1 الأتصال Attachment من خلال مستقبلات I - Through receptors CD4 HIV Ig Poliovirus Heparan sulfate HSV, Adenovirus التصادم العشوائي II - Random collision T- cell

Virus attachment

.2 الدخول Entry -I الاندماج الغشائي Membrane Fusion Paramyxovirus + HIV

.2 الدخول Entry -IIالتحوصل من خلال مستقبلات Receptor-mediated Endocytosis الاندماج في الأ ندوسوم Fusion in Endosome Influenza virus j

.2 الدخول Entry -IIالتحوصل من خلال مستقبلات Receptor-mediated Endocytosis تحلل الاندوسوم Lysis of Endosome Adenovirus

Influenza + Adenovirus .3 التـقـشـر Uncoating - Direct or Partial uncoating مباشر أو جزئي Paramyxovirus + HIV Endosome …. Conformational changes تغيرات شكلية Influenza + Adenovirus

.4 التكاثر وإنتاج بروتينات الفيروس Replication and viral protein production Class I: Double - stranded DNA - التكاثر في النواه Adenovirus + Herpes virus -التكاثر في السيتوبلازم poxvirus

DNA REPLICATION DNA DNA DNA DNA SIMPLIFIED SCHEME 3’ 3’ 3’ 5’ 5’ 5’ NICKED SIMPLIFIED SCHEME

Class II : Single - stranded DNA - النواة double - stranded intermediate (Template) Parvovirus

Positive (+) RNA virus replicative cycle AAA nucleus - Viral proteins off + strand + AAA Viral particles

Class III: Double - stranded RNA - مجزأة Segmented - السيتوبلازم Reovirus

DOUBLE-STRANDED RNA GENOMES RNA polymerase must be packaged in virion. proteins (+ve) sense mRNA AAA Double-stranded genomic RNA If used, RNA modifying enzymes are packaged in virion.

mRNA polyproteins proteins Class IV: Single – stranded (+) sense RNA - السيتوبلازم Cytoplasm I - Polycistronic mRNA mRNA polyproteins proteins Translation Cleavage ترجمه انقسام Picornavirus

PLUS (POSITIVE) SENSE RNA GENOMES proteins (+ve) sense mRNA AAA

Class IV: Single – stranded (+) sense RNA - السيتوبلازم Cytoplasm II - complex transcription 1 – (I) RNA Pol. Enzyme + (II) Capsid Togavirus 2 - Subgenomic RNA Coronavirus I + II genomic RNA

Class V: Single - stranded (-) sense RNA - السيتوبلازم I - Non -segmented genome Paramyxovirus II- Segmented genome - النواه Orthomyxovirus

MINUS (NEGATIVE) SENSE RNA GENOMES proteins (+ve) sense mRNA AAA (-ve) sense genomic RNA

MINUS (NEGATIVE) SENSE RNA GENOMES RNA polymerase must be packaged in virion. proteins (+ve) sense mRNA AAA (-ve) sense genomic RNA If used, RNA modifying enzymes are packaged in virion.

Negative-strand virus replication 5’ 3’ (-) 5’ 3’ (+) (+) (+) Viral genome (-) coded off + strand RNA Protein synthesis from + strand RNA 5’ (+) 3’ Infectious virus particles

Class VI: single - stranded (+) sense RNA with DNA intermediate RNA dDNA RNA Retrovirus RT Host

Reverse transcriptase must be packaged in virion. RETROVIRUSES Reverse transcriptase must be packaged in virion. DS DNA DS DNA +VE RNA

Class VII: Double - stranded DNA with RNA intermediate dDNA RNA dDNA Hepadnavirus (HBV) N C RT

Genome Free inside cell No infectious Particles One - Step Growth Cycle: فترة الكسوف Eclipse period (11H) Post-infection (PI) Genome Free inside cell No infectious Particles طور التكاثر Synthetic phase (12 H) P.I. Infections particles

Typical Growth Curve: 10 Total or intracellular + extracellular 8 Latent period Extracellular 6 PFU/ml 4 2 4 12 20 28 36 44 50 Eclipse period Hours post adsorption

One - Step Growth Cycle: فترة الكسوف Eclipse period طور التكاثر Synthetic phase الطور المتأخر Latent period (18 H) P.I. No extracellular virus

- البروتينات التركيبية - الأحماض النووية - الأنزيمات الفيروسية .5التجمع والتحرر Assembly + Release - البروتينات التركيبية - الأحماض النووية - الأنزيمات الفيروسية - موقع التجمع يعتمد على موقع التكاثر Picornavirus , Poxvirus , Reovirus…etc Cytoplasm Adenovirus , Polyomavirus …etc Nucleus

Virus Assembly

.5التجمع والتحرر Assembly + Release - النضج Maturation - Infectious - Conformational changes Fo F1 + F2 paramyxovirus Fusion protein Cleavage Proteases

التحرر Release - I التحلل Lysis Non - enveloped Lytic viruses - II التبرعم Budding Enveloped I + II death of cell (CPE)