Labeled and annotated multiple sequence alignment of COQ9. Amino acid sequences of COQ7 were analyzed as described in Materials and Methods and include Homo sapiens (NCBI accession number NP_064708.1) and homologs in Saccharomyces cerevisiae (QHB10353.1), Rickettsia prowazekii (WP_004596292.1), Sphingomonas yanoikuyae (EKU74250.1), Sphingopyxis granuli (WP_082737038.1), Schizosaccharomyces pombe (NP_594426.1), Drosophila melanogaster (NP_724594.1), Danio rerio (NP_001092216.1), Bos taurus (NP_001039767.1), and Mus musculus (NP_080728.1). See KEY for descriptions of the figure annotations. Residues in the HTH domain are boxed in cyan and COQ9 surface patch in red, data from [25]. COQ7 interaction residues are marked with orange dots, data from [52]. Ligand-binding residues are marked with purple dots, data from [50].