Abstract
Cupriavidus sp. strain AMP6 is an aerobic, motile, Gram-negative, non-spore-forming rod that was isolated from a root nodule of Mimosa asperata collected in Santa Ana National Wildlife Refuge, Texas, in 2005. Mimosa asperata is the only legume described so far to exclusively associates with Cupriavidus symbionts. Moreover, strain AMP6 represents an early-diverging lineage within the symbiotic Cupriavidus group and has the capacity to develop an effective nitrogen-fixing symbiosis with three other species of Mimosa. Therefore, the genome of Cupriavidus sp. strain AMP6 enables comparative analyses of symbiotic trait evolution in this genus and here we describe the general features, together with sequence and annotation. The 7,579,563 bp high-quality permanent draft genome is arranged in 260 scaffolds of 262 contigs, contains 7,033 protein-coding genes and 97 RNA-only encoding genes, and is part of the GEBA-RNB project proposal.
Highlights
Cupriavidus is one of two known genera of Betaproteobacteria that include legume root-nodule symbionts [1]
The other genus, Burkholderia, has multiple species associated with diverse legume host plants indigenous to North and South America, South Africa and Australia [2,3,4,5,6,7,8]
In South America, Cupriavidus was uncommon in French Guiana and Uruguay (3-10 % of nodule isolates; [9, 11]), and was not detected at all in extensive surveys of Mimosa in central Brazil [5, 6]
Summary
Cupriavidus is one of two known genera of Betaproteobacteria that include legume root-nodule symbionts [1]. Cupriavidus, by contrast, has only been isolated from four species in two legume genera in the tribe Mimoseae (Mimosa, Parapiptadenia), at a few locations in the native geographic ranges of their host plants (south Texas, the Caribbean, central America, French Guiana, and Uruguay; [2, 9,10,11,12]). The range of M. asperata is centered in Mexico and extends slightly into south Texas, Cuba, and northern Central America [19] Based on both housekeeping loci and symbiotic loci, strain AMP6 represents an early-diverging lineage of nodule-symbiotic Cupriavidus [10, 12], whose genome may provide insights about how legume nodule symbiosis became established in this group.
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