Viral interaction with host cell sumoylation system
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Transcript of Viral interaction with host cell sumoylation system
Viral Interaction with Host cell SUMOylation system
R. SANTHAMANIR. SANTHAMANI I. SOPHIAI. SOPHIA
Ph.D. StudentPh.D. StudentDivision of VirologyDivision of Virology
Indian Veterinary Research InstituteIndian Veterinary Research InstituteMukteswarMukteswar
Uttarakhand.Uttarakhand.
Contents
1. What is sumoylation?
2. Discovery
3. Sumoylation pathway
4. Importance of sumoylation
5. Immunity and sumoylation
6. Viruses and sumoylation
7. What we gain?
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.
Phosphorylation
Glycosylation
Ubiquitinatination
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What is sumoylation?
SUMO – Small Ubiquitin like Modifier
101 amino acid length
Post translational modification
Location: nucleus - eukaryotes
3(Saitoh et al., 1997)
DISCOVERY
Discovered independently Study of Pro-Pro and Pro-NA interactions - Yeast 2-hybrid screens (Boddy et al., 1996; Okura et al., 1996; Shen et al., 1996) Biochemical analysis of nuclear transport component, RanGAP1 (Matunis et al., 1996; Mahajan et al., 1997) cDNA mapping of human chromosome 21 (Lapenta et al., 1997)known by
UBL1 (Shen et al., 1996)
Sentrin (Kamitani et al., 1997)
GMP1 (Matunis et al., 1996)
hSMT3C (Lapenta etal., 1997)
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known to be proteins involved in Sumoylation - SUMO proteins
4
Sumoylation pathway
Between lysine residue of substrate and C- terminal GG motif of SUMO
Consensus motif Ψ-K-x-D/E
Between lysine residue of substrate and C- terminal GG motif of SUMO
Consensus motif Ψ-K-x-D/E Sumoylated
protein(Desterro et al., 1997)05/08/14 Viruses and SUMOylation 5
Why Sumoylation system is needed??
Sumolytion of vital cell
proteins pRB, PML and
RepA protein
Targeted transport
between nucleus and
cytoplasm
Gives stability to many
labile proteins – highly
folded structure
(Bayer et al., 1998)
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05/08/14 Viruses and SUMOylation
Immunity and sumoylation…
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Sumoylation of RIG 1, MDA 5 and Pellino 1
Upregulation of IFN production
Represses viral replication
Sumoylation of RIG 1, MDA 5 and Pellino 1
Upregulation of IFN production
Represses viral replication
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Immunity and sumoylation …
(Zeng et al., 2010 & Wilson et al., 2012)
Innate immunity
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TLR PATHWAY
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Immunity and sumoylation…
(Kim et al., 2011)
RLR PATHWAY
(Zeng et al., 2010)Sumoylation of RIG 1 and MDA 5
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Immunity and sumoylation…
Type I IFN
Genetically encoded proteins - target the invading viruses
Expressed at a constant level
Allows the viral infection to be halted quickly
Genetically encoded proteins - target the invading viruses
Expressed at a constant level
Allows the viral infection to be halted quickly
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Immunity and sumoylation …
Intrinsic immunity
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(Everett et al., 2009)
Members of TRIM family of
proteins
Sumoylation of TRIM family proteins play
a role in antiviral activity
TRIM5α – retrovirus infections
TRIM5α has SIM motif to bind
with sumoylated CA of MLV
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(Nakayama et al., 2012)
Intrinsic immunity
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Immunity and sumoylation…
05/08/14Viruses and SUMOylation
(Geoffroy et al., 2011)
PML protein – Antiviral activity
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Immunity and sumoylation…
Eg. HSV
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Viruses and Sumoylation
Sumoylation process is exploited by viral pathogen to regulate their
activity
Many of the DNA viruses use sumoylation for targeting their vital
proteins to the nucleus to exploit host cell nuclear machinery
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Virus Protein Function References
Adenovirus E1B-55K Transformation Endter et al., 2001
Adeno-associated virus Rep 78 Latency Weger et al., 2004
Epstein-Barr virus Rta (FRLF1)EBNA3C
Lytic activationTranscription
Chang et al., 2004Rosendorff et al., 2004
Moloney murine leukemia virus
CA Early stage of infection Yeuh et al., 2006
Human T cell leukemia virus
Tax Induction of cancer Lamsoul et al., 2005
Papillomavirus E1E2
ReplicationTranscription of oncogenes E6 , E7
Rangasamy et al., 2000
Marusic et al., 2010
Parainfluenza virus 5 P Replication Sun et al., 2011
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Sumoylation of viral proteins
15
Viruses and sumoylation…
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Viruses have evolved to exploit further this intricate mechanism for
their own benefit
vProteins
Mimic sumoylation enzymes
Act as STUbLs
Targets sumoylation enzymes
Modulate sumoylation of specific host SUMO
substrates
Can viruses exploit more …? If so…Can viruses exploit more …? If so…how??? how???
16
(Chang et al., 2010)
Viruses and sumoylation…
05/08/14Viral interaction with host cell sumoylation
system
vProteins that mimic sumoylation enzymes
KSHV – KbZIP
Binds with SUMO
Sumoylate the binding partners - p53 & pRB
SIM motifSIM
motif
SUMO ligase
(Pennella et al., 2010)
Viruses and sumoylation…
Favourable for virus?
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system
vProteins that act as STUbLs
HSV – ICP0 protein
Bind to sumoylated PML
Ubiquitination and proteasomal degradation of PML
Act as Ubiquitin
ligase
SIM like
motif
SIM like
motif
(Perry et al., 2008)
Viruses and sumoylation…
05/08/14Viral interaction with host cell sumoylation
system
vProteins that targets sumoylation enzymes
Adenovirus Adenovirus
Sumoylation reducedEg. PML
(Boggio et al., 2004)
Viruses and sumoylation…
05/08/14Viral interaction with host cell sumoylation
system
HPV L2HPV E6
Viral cycle (Heaton et al., 2011)
Sumo ligase
Sumoylating pRB
Maintains cell in quiescent
Ebola virus VP35
Sumoylation of IRF7
Transcriptin of IFN reduced
(Chang et al., 2009)
Viruses and sumoylation…
05/08/14Viral interaction with host cell sumoylation
system
vProteins that modulate vProteins that modulate sumoylation of specific host sumoylation of specific host
SUMO substratesSUMO substrates
Adenovirus E1A, Papilloma virus E7
pRB
Maintains cell at definite stage of cell cycle
Cell enters S-Phase *favourable for virus replication
E2F
(Ledl et al., 2005)
Viruses and sumoylation…
05/08/14Viral interaction with host cell sumoylation
system
p53 - remains in nucleus
Cell cycle arrest, apoptotic signalling in viral infected cells
Adenovirus E1B
Sumoylates p53 &targets it to cytoplasm, makes it non-functional
Contd…
Sumo ligaseSumo ligase
(Lazo et al., 2011)
Viruses and sumoylation…
(Wilson, 2012)05/08/14 Viruses and SUMOylation
Viruses and sumoylation : sumoylation : In total!! In total!!
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What we gain??..
Better understanding of
Current knowledge on virus cell interaction
Nuclear targeting system
Signalling systems are regulated by sumoylation
Cellular regulatory functions
Some aspects of pathogenesis of Cancer
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Only Only knowledge??..knowledge??..
SUMO gene fusion technology for expressing labile proteins like granzyme
If attaching SUMO to the N-terminus of poorly expressed proteins dramatically enhances the level of expression (Butt et al., 2005)
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Sumoylation is an essential PTM system in eukaryotes
Plays vital role in PTM of critical protein involved in overall cell signalling
systems including signalling pathways of intrinsic and innate immunity
Vital for transport of proteins between cytosol and nucleus
There are established intricate connections between sumoylation, viral
infection and cancer pathogenesis
SUMO fusion technology is a promising technique for bulk expression of
difficult to express proteins
May be having important role in prion pathogenesis but needs to be
investigated
To conclude…To conclude…
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Future….????Future….????
Role of Sumoylation in prion diseases? For bulk production of recombinant antibodies ?
Targeted delivery to nucleus by sumoylation?
Drugs/chemicals/therapeutics with property of
controlled regulation of sumoylation for treating
cancer and viral infections?
27
THANK YOU
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