The Major Outer Membrane Protein of Chlamydia psittaci Functions as a Porin-Like Ion Channel
AUTOR(ES)
Wyllie, Susan
FONTE
American Society for Microbiology
RESUMO
The major outer membrane protein (MOMP) of Chlamydia species shares several biochemical properties with classical porin proteins. Secondary structure analysis by circular dichroism now reveals that MOMP purified from Chlamydia psittaci has a predominantly β-sheet content (62%), which is also typical of bacterial porins. Can MOMP form functional ion channels? To directly test the “porin channel” hypothesis at the molecular level, the MOMP was reconstituted into planar lipid bilayers, where it gave rise to multibarreled channels, probably trimers, which were modified by an anti-MOMP monoclonal antibody. These observations are consistent with the well-characterized homo-oligomeric nature of MOMP previously revealed by biochemical analysis and with the triple-barreled behavior of other porins. MOMP channels were weakly anion selective (PCl/PK ∼ 2) and permeable to ATP. They may therefore be a route by which Chlamydia can take advantage of host nucleoside triphosphates and explain why some anti-MOMP antibodies neutralize infection. These findings have broad implications on the search for an effective chlamydial vaccine to control the significant human and animal diseases caused by these organisms.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=108649Documentos Relacionados
- The Moraxella catarrhalis Porin-Like Outer Membrane Protein CD Is an Adhesin for Human Lung Cells
- Identification of a Bordetella pertussis bvg-regulated porin-like protein.
- A Major Outer Membrane Protein of Rahnella aquatilis Functions as a Porin and Root Adhesin
- Expression of a Gene for a Porin-Like Protein of the OmpA Family from Mycobacterium tuberculosis H37Rv
- Immunochemical diversity of the major outer membrane protein of avian and mammalian Chlamydia psittaci.
