Comparison of Auxenochlorella protothecoides and Chlorella

Park, Sang-Hyuck; Kyndt, John A.; Brown, Judith K.

doi:10.3390/life12030458

Title: Comparison of Auxenochlorella protothecoides and Chlorella

Journal Article · 20 March 2022 · Life

DOI: https://doi.org/10.3390/life12030458 · OSTI ID:1855844

Park, Sang-Hyuck ^[1];

^[2];

^[3]

University of Arizona, Tucson, AZ (United States); Colorado State University, Pueblo, CO (United States)
Bellevue University, NE (United States)
University of Arizona, Tucson, AZ (United States)

Resequencing of the chloroplast genome (cpDNA) of Auxenochlorella protothecoides UTEX 25 was completed (GenBank Accession no. KC631634.1), revealing a genome size of 84,576 base pairs and 30.8% GC content, consistent with features reported for the previously sequenced A. protothecoides 0710, (GenBank Accession no. KC843975). The A. protothecoides UTEX 25 cpDNA encoded 78 predicted open reading frames, 32 tRNAs, and 4 rRNAs, making it smaller and more compact than the cpDNA genome of C. variabilis (124,579 bp) and C. vulgaris (150,613 bp). By comparison, the compact genome size of A. protothecoides was attributable primarily to a lower intergenic sequence content. The cpDNA coding regions of all known Chlorella species were found to be organized in conserved colinear blocks, with some rearrangements. The Auxenochlorella and Chlorella species genome structure and composition were similar, and of particular interest were genes influencing photosynthetic efficiency, i.e., chlorophyll synthesis and photosystem subunit I and II genes, consistent with other biofuel species of interest. Phylogenetic analysis revealed that Prototheca cutis is the closest known A. protothecoides relative, followed by members of the genus Chlorella. The cpDNA of A. protothecoides encodes 37 genes that are highly homologous to representative cyanobacteria species, including rrn16, rrn23, and psbA, corroborating a well-recognized symbiosis. Several putative coding regions were identified that shared high nucleotide sequence identity with virus-like sequences, suggestive of horizontal gene transfer. Despite these predictions, no corresponding transcripts were obtained by RT-PCR amplification, indicating they are unlikely to be expressed in the extant lineage.

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Research Organization:: Donald Danforth Plant Science Center, St. Louis, MO (United States); Univ. of Arizona, Tucson, AZ (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE

Grant/Contract Number:: EE0003046; EE0006269

OSTI ID:: 1855844

Alternate ID(s):: OSTI ID: 1981150

Journal Information:: Life, Vol. 12, Issue 3; ISSN 2075-1729

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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