Chlamydial MACPF protein CT153
Lacey D Taylor1, David E Nelson
1Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Disease, National Institutes of Health, 903 S. 4th Street, Hamilton, MT 59840, USA, ltaylor113@hotmail.com.
Abstract:
Chlamydiae are obligate intracellular bacterial parasites that infect a wide range of metazoan hosts. Some Chlamydia species are important causes of chronic inflammatory diseases of the ocular, genital and respiratory tracts in humans. Genes located in a variable region of chlamydial genomes termed the plasticity zone are known to be key determinants of pathogenic diversity. The plasticity zone protein CT153, present only in select species, contains a membrane attack complex/perforin (MACPF) domain, which may mediate chlamydial interactions with the host cell. CT153 is present throughout the C. trachomatis developmental cycle and is processed into polypeptides that interact with membranes differently than does the parent protein. Chlamydiae interact extensively with membranes from the time of invasion until they eventually exit host cells, so numerous roles for a MACPF protein in pathogenesis of these pathogens are conceivable. Here, we present an overview of what is known about CT153 and highlight potential roles of a MACPF family protein in a group of pathogens whose intracellular development is marked by a series of interactions with host cell membranes and organelles. Finally, we identify new strategies for identifying CT153 functions made feasible by the recent development of a basic toolset for genetic manipulation of chlamydiae.
Insights
The Chlamydia plasticity zone protein CT153, featuring a MACPF domain, is crucial for bacterial interactions with host cell membranes during infection. New genetic tools aid in uncovering its specific pathogenic functions.
Area of Science:
- Microbiology and Pathogenesis
- Bacterial Genetics and Molecular Biology
- Host-Pathogen Interactions
Background:
- Chlamydiae are obligate intracellular bacteria causing human inflammatory diseases.
- The chlamydial plasticity zone contains genes critical for pathogenic diversity.
- Protein CT153, found in select Chlamydia species, possesses a membrane attack complex/perforin (MACPF) domain.
Purpose of the Study:
- To review existing knowledge on the chlamydial protein CT153.
- To explore potential roles of CT153's MACPF domain in Chlamydia pathogenesis.
- To highlight new strategies for functional analysis of CT153 using genetic tools.
Main Methods:
- Review of literature on Chlamydia pathogenesis and the CT153 protein.
- Analysis of CT153's presence and processing throughout the Chlamydia trachomatis developmental cycle.
- Discussion of potential MACPF domain functions in host-pathogen membrane interactions.
Main Results:
- CT153 is present throughout the Chlamydia developmental cycle.
- CT153 is processed into polypeptides with distinct membrane interaction properties.
- The MACPF domain of CT153 is hypothesized to mediate interactions with host cell membranes.
Conclusions:
- CT153 is a key protein involved in Chlamydia's interaction with host cell membranes.
- Understanding CT153 function is vital for comprehending Chlamydia pathogenesis.
- Recent advances in genetic manipulation tools offer new avenues for studying CT153 functions.
