NDLI: Multi-membrane-bound structures of Apicomplexa: I. the architecture of the Toxoplasma gondii apicoplast

Content Provider	Springer Nature Link
Author	Köhler, Sabine
Copyright Year	2005
Abstract	Apicomplexan parasites carry a plastid-like organelle termed apicoplast. The previous documentation of four membranes bordering the Toxoplasma gondii apicoplast suggested a secondary endosymbiotic ancestry of this organelle. However, a four-membraned apicoplast wall could not be confirmed for all Apicomplexa including the malarial agents. The latter reportedly possesses a mostly tri-laminar plastid wall but also displays two multi-laminar wall partitions. Since these sectors apparently evolved from regional wall membrane infoldings, the malarial plastid could have lost one secondary wall membrane in the course of evolution. Such wall construction was however not unambiguously resolved. To examine whether the wall of the T. gondii apicoplast is comparably complex, serial ultra-thin sections of tachyzoites were analyzed. This investigation revealed a single pocket-like invagination within a four-laminar wall segment but also disclosed that four individual membranes do not surround the entire T. gondii apicoplast. Instead, this organelle possesses an extensive sector that is bordered by two membranes. Such heterogeneous wall construction could be explained if the inner two membranes of a formerly four-membraned endosymbiont are partially lost. However, our findings are more consistent with an essentially dual-membraned organelle that creates four-laminar wall sectors by expansive infoldings of its interior border. Given this architecture, the T. gondii apicoplast depicts a residual primary plastid not a secondary one as presently proposed.
Starting Page	258
Ending Page	272
Page Count	15
File Format	PDF
ISSN	09320113
Journal	Parasitology Research
Volume Number	96
Issue Number	4
e-ISSN	14321955
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-05-14
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Veterinary Parasitology Insect Science

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