Production of plasmid-encoded chlamydial proteins in host cells Jeffrey Burnett
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Transcript Production of plasmid-encoded chlamydial proteins in host cells Jeffrey Burnett
Production of plasmid-encoded
chlamydial proteins in host cells
Jeffrey Burnett
Dr. Dan Rockey Lab
Chlamydia trachomatis
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most common STI
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causes:
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2.8 million cases annually
Pelvic Inflammatory Disease
Ectopic pregnancy
Infertility
Preventable blindness
asymptomatic
C. trachomatis
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Gram (-) bacterium
Obligate intracellular
aerobe
▫ Cannot make its own ATP
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Inclusion
Biphasic lifecycle
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Non-infectious
metabolically active form
Infectious “spore” form
Background knowledge
Horoschak and Moulder
Bose and Liebhaber
Decrease in amount of cells
No decrease in DNA synthesis
Greene and Zhong
Interactions between chlamydia and host cell cycle
Background knowledge
McCoy cells – blue (nuclei), green
(cytoskeleton)
McCoy cells – blue (nuclei), green
(cytoskeleton), red (chlamydial protein
transfection - CT223)
Background information
Rockey et al
Inclusion membrane proteins (inc)
CT119 - incA
Identification of CT 223 as inc gene
My Project
Two projects:
Find active domain of CT 223
Double transfection with genes in inc
operon
Project #1
Construct
p23f
Structure of construct
1
96
p23cL1/2
96
DA97/DA116
25%
DA71/DA116
8%
DA71/DA121
15%
DA122/DA116
158
270
214
p23f2/3
Hydrophobic domain
23%
270
159
1
Oligos
270
p23c
p23cR1/2
PN
7%
Hydrophilic regions
DA97/DA119
Project #1 - conclusion
Active site of CT223 is c-terminus 56 AA
sequence
To do:
What is the relevance?
Note: Chlamydia blocks cytokinesis
Find binding partners
Project #2 - part one
gene # / restriction site
Sequence
CT223 C. trachomatis / Eco RI
agcaGAATTCttgagatctagaaaaatagaagc
CT223 C. trachomatis / KpnI
agcaGGTACCaatggtgagtttagcattagg
CT224 C. trachomatis / EcoRI
agcaGAATTCatgagttttgttggagatagt
CT224 C. trachomatis / XhoI
agcaCTCGAGctaatcattgggaaaaattga
CT225 C. trachomatis / EcoRI
agcaGAATTCatggtggctaacaactcctttatt
CT225 C. trachomatis / EcoRV
agcaGATATCttaatcccacccatgaaattt
CT226 C. trachomatis / EcoRI
agcaGAATTCatgttggccttttttttgcga
CT226 C. trachomatis / EcoRV
agcaGATATCttatatcagactttcttccaa
CT227 C. trachomatis / EcoRI
agcaGAATTCatgtcttatcttttttgttcc
CT227 C. trachomatis / EcoRV
agcaGATATCtcatgagacacttatagtcac
Make expression
vectors
Transformation
Send for sequencing
Project #2 - part one
Project #2 - part one
Project #2 - part two
Goal of part two:
1.
Attain double transfection of same host mammalian cell
2.
Conclude whether or not there is an effect on polynuclear
cells
Project #2 - part two
224/223
227/223
233 only
RFP/GFP
Mock
Transfected
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
Polynuclear
Average
6
6
7
5
5
4
7
4
6
6
3
5
3
2
1
0
2
1
0
1
% of total
Total
24
28
20
20
23
100/24
20
100/20
20
100/20
6
100/6
4
100/4
20
16
28
16
24
24
12
20
12
8
4
0
8
4
0
4
Relative number of polynuclear cells (%)
Project #2 - part two
30
25
20
15
223/224
227/223
223
10
RFP/GFP
Mock
5
0
Results
No effect on polynuclear morphology between
single transfection CT223 and double
transfections
To do:
Transfections with CT225, and CT226 to see if same
conclusion can be drawn
Summary
Project #1
Found active domain of CT223 - last 56 aa
To Do: relevance / active partner in host
Project #2
Found no increase in rate of polynuclear cells in doubletransfected cells
To Do: look at other genes (CT225, CT226)
Acknowledgements
Howard Hughes Medical Institute
Dr. Dan Rockey and his Lab
Dr. Kevin Ahern
Damir Alzhanov
Department of Biomedical Sciences in the
college of Veterinary Medicine
Thank you for your
time.
Questions?