Abstract
The present study reports the functional annotation of complete genome of methylotrophic bacterium Paracoccus sp. strain AK26. The 3.6 Mb genome with average GC content of 65.7% was distributed across five replicons; including chromosome (2.7 Mb) and four extrachromosomal replicons pAK1 (471Kb), pAK2 (189Kb), pAK3 (129Kb) and pAK4 (84 Kb). Interestingly, nearly 23% of the Cluster of Orthologous Group (COG) of proteins were annotated on extrachromosomal replicons and 185Kb genome content was attributed to segregated 19 genomic island regions. Among the four replicons, pAK4 was identified as essential and integral part of the genome, as supported by codon usage, GC content (66%) and synteny analysis. Comparative genome analysis for methylotrophy showed mechanistic variations in oxidation and assimilation of C1 compounds among closely related Paracoccus spp. Collectively, present study reports the functional characterization and genomic architecture of strain AK26 and provides genetic basis for quinone and isoprenoid based secondary metabolites synthesis using strain AK26.
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