Tarp regulates early Chlamydia-induced host cell survival through interactions with the human adaptor protein SHC1.

The Journal of Cell Biology
Adrian MehlitzThomas F Meyer

Abstract

Many bacterial pathogens translocate effector proteins into host cells to manipulate host cell functions. Here, we used a protein microarray comprising virtually all human SRC homology 2 (SH2) and phosphotyrosine binding domains to comprehensively and quantitatively assess interactions between host cell proteins and the early phase Chlamydia trachomatis effector protein translocated actin-recruiting phosphoprotein (Tarp), which is rapidly tyrosine phosphorylated upon host cell entry. We discovered numerous novel interactions between human SH2 domains and phosphopeptides derived from Tarp. The adaptor protein SHC1 was among Tarp's strongest interaction partners. Transcriptome analysis of SHC1-dependent gene regulation during infection indicated that SHC1 regulates apoptosis- and growth-related genes. SHC1 knockdown sensitized infected host cells to tumor necrosis factor-induced apoptosis. Collectively, our findings reveal a critical role for SHC1 in early C. trachomatis-induced cell survival and suggest that Tarp functions as a multivalent phosphorylation-dependent signaling hub that is important during the early phase of chlamydial infection.

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Methods Mentioned

BETA
nucleotide exchange
protein array
coimmunoprecipitation
pull-down
pull down
GTPase
immunoprecipitation
PCR
size exclusion column chromatography
transfection

Software Mentioned

Photoshop
Image Reader LAS - 3000
Scan
AIDA
Adobe
Ingenuity Pathway Analysis ( IPA )
Step One Plus
IPA
Rosetta Resolver
Excel

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