Evidence of a putative CO₂ delivery system to the chromatophore in the photosynthetic amoeba Paulinella.

ABSTRACT: The photosynthetic amoeba, Paulinella provides a recent (ca. 120 Mya) example of primary plastid endosymbiosis. Given the extensive data demonstrating host lineage-driven endosymbiont integration, we analysed nuclear genome and transcriptome data to investigate mechanisms that may have evolved in Paulinella micropora KR01 (hereinafter, KR01) to maintain photosynthetic function in the novel organelle, the chromatophore. The chromatophore is of α-cyanobacterial provenance and has undergone massive gene loss due to Muller's ratchet, but still retains genes that encode the ancestral α-carboxysome and the shell carbonic anhydrase, two critical components of the biophysical CO₂ concentrating mechanism (CCM) in cyanobacteria. We identified KR01 nuclear genes potentially involved in the

SUBMITTER: Gabr A 

PROVIDER: S-EPMC11194058 | biostudies-literature | 2024 Jun

REPOSITORIES: biostudies-literature