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Nitrogen Recycling and Nutritional Provisioning by Blattabacterium, the Cockroach Endosymbiont

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Nitrogen Recycling and Nutritional Provisioning by Blattabacterium, the Cockroach Endosymbiont Nitrogen recycling and nutritional provisioning by Blattabacterium, the cockroach endosymbiont Zakee L. Sabreea,b, Srinivas Kambhampatic, and Nancy A. Moranb,1 aCenter for Insect Science and bDepartment of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721-0088; and cDepartment of Entomology, Kansas State University, Manhattan, KS 66506-4004 Edited by Jeffrey I. Gordon, Washington University School of Medicine, St. Louis, MO, and approved September 23, 2009 (received for review July 8, 2009) Nitrogen acquisition and assimilation is a primary concern of within their fat bodies, near the uric acid deposits (9), and they insects feeding on diets largely composed of plant material. Re- have been hypothesized to participate in nitrogen recycling from claiming nitrogen from waste products provides a rich reserve for stored uric acid (10, 11). Periplaneta americana fat bodies are this limited resource, provided that recycling mechanisms are in comprised of two distinct cell types: adipocytes, containing fat place. Cockroaches, unlike most terrestrial insects, excrete waste globules and uric acid crystals, and mycetocytes, which are filled nitrogen within their fat bodies as uric acids, postulated to be a densely with Blattabacterium (9, 11–13). After antibiotic treat- supplement when dietary nitrogen is limited. The fat bodies of ment to remove Blattabacterium, mycetocytes appear to be highly most cockroaches are inhabited by Blattabacterium, which are degraded, uric acid accumulates significantly (13–15), and pro- vertically transmitted, Gram-negative bacteria that have been duction of tyrosine, phenylalanine, isoleucine, valine, arginine, hypothesized to participate in uric acid degradation, nitrogen and threonine is reduced (16). Consequently, production of assimilation, and nutrient provisioning. We have sequenced com- these amino acids has been attributed to Blattabacterium. pletely the Blattabacterium genome from Periplaneta americana. Phylogenetic analysis indicates that Blattabacterium is a member Genomic analysis confirms that Blattabacterium is a member of the of the Flavobacteriales, where it clusters with other insect bacteri- Flavobacteriales (Bacteroidetes), with its closest known relative ome-associated symbionts, Candidatus Sulcia muelleri (hereafter being the endosymbiont Sulcia muelleri, which is found in many referred to as Sulcia, hosts in numerous sap-feeding insects within sap-feeding insects. Metabolic reconstruction indicates that it lacks Hemiptera: Auchenorrhyncha) and Candidatus Uzinura diaspidi- recognizable uricolytic enzymes, but it can recycle nitrogen from cola (hosts in sap-feeding scale insects, family Diaspididae), and an urea and ammonia, which are uric acid degradation products, into insect host-manipulator, the male-killing ladybird beetle endosym- glutamate, using urease and glutamate dehydrogenase. Subse- biont (17–20). Blattabacterium appears to have infected the com- quently, Blattabacterium can produce all of the essential amino mon ancestor of cockroaches and termites Ͼ140 Mya (21, 22). It has acids, various vitamins, and other required compounds from a been maintained in all cockroaches except the cave-dwelling Noc- limited palette of metabolic substrates. The ancient association ticola and lost in all termites except the basal species, Mastotermes with Blattabacterium has allowed cockroaches to subsist success- darwiniensis (17, 22). Although the existence of Blattabacterium has fully on nitrogen-poor diets and to exploit nitrogenous wastes, been known for over 100 years, efforts to fully characterize it have capabilities that are critical to the ecological range and global been thwarted by its unsurprising recalcitrance to cultivation (23). distribution of cockroach species. Many beneficial bacterial symbionts with exclusively intracellular lifestyles (i.e., Buchnera aphidicola) have lost their ability to live Flavobacteria ͉ insect endosymbiont ͉ nitrogen conservation ͉ uricolysis outside their hosts but have free-living, cultivable relatives (e.g., Escherichia coli) (24). To elucidate further the role of Blattabacte- rium in nutrient provisioning, nitrogen conservation, and uric acid itrogen acquisition for cellular metabolism is a primary metabolism, we sequenced the genome of the P. americana endo- concern of herbivorous animals. Cockroaches (Dictyoptera: N symbiont Blattabacterium sp. BPLAN. Blattaria) typically consume decaying (nitrogen-poor) plant material but can be omnivorous, feeding opportunistically on Results and Discussion decaying animal material and even (nitrogen-rich) conspecifics The genome of Blattabacterium sp. BPLAN is comprised of a (1). Cockroaches respond to surplus nitrogen by concentrating 636,994-bp circular chromosome and a 3,448-bp plasmid with and storing it as uric acid, which is excreted typically by terrestrial G ϩ C contents of 28.2% and 28.5%, respectively. Thirty-three insects, within fat body cells (2). Increasing dietary nitrogen tRNAs corresponding to all of the amino acids are encoded on concentrations correlates with uric acid deposition in cockroach the chromosome. Additionally, a single 16S-23S-5S operon and fat bodies (2, 3). These internal stores are thought to serve as a tmRNA gene are present. Complete transcriptional machinery, metabolic reserves, providing an essential supplement when including the major sigma factor RpoD, is encoded in the sufficient dietary nitrogen is lacking and a means for exploiting genome. The origin of replication was predicted based on GC nitrogen-rich windfalls (4). skew, and the first nucleotide in the nearest protein-coding Although the ecological rationale for nitrogen conservation in region was designated as position 1 (Fig. S1). Blattabacterium phytophagous insects is clear, utilization of uric acid as a encodes 581 ORFs, comprising 94% of the sequence, and 520 nitrogen reserve is not well understood. Many insects and other ORFs have an assigned function (Table 1). Four genes, encoding animals do not have the enzymatic capabilities required for producing ammonia from urate. Nitrogen recycling from stored MICROBIOLOGY uric acid in shield bugs and termites has been attributed to Author contributions: Z.L.S., S.K., and N.A.M. designed research; Z.L.S. and S.K. performed symbiotic microbes. The presence of Erwinia-like bacteria in research; Z.L.S., S.K., and N.A.M. analyzed data; and Z.L.S. and N.A.M. wrote the paper. Parastrachia japonensis, which are located exclusively in the The authors declare no conflict of interest. gastric ceca, correlates with enzymatic uricolysis in the gastric This article is a PNAS Direct Submission. ceca (5). Similarly, Reticulitermes flavipes hindgut bacteria fer- Data deposition: The sequences reported in this paper have been deposited in the GenBank ment uric acid transported from the fat bodies, via the Mal- database (accession nos. CP001429 and CP001430). pighian tubules to the hindgut, into ammonia, CO2, and acetate 1To whom correspondence should be addressed. E-mail: [email protected]. (6–8). Cockroaches, close relatives of termites, harbor intracel- This article contains supporting information online at www.pnas.org/cgi/content/full/ lular, maternally transmitted bacteria, called Blattabacterium sp., 0907504106/DCSupplemental. www.pnas.org͞cgi͞doi͞10.1073͞pnas.0907504106 PNAS ͉ November 17, 2009 ͉ vol. 106 ͉ no. 46 ͉ 19521–19526 Downloaded by guest on October 3, 2021 Table 1. Comparison of Blattabacterium sp. BPLAN genome with those of other Flavobacteriales Blattabacterium sp. BPLAN Sulcia muelleri GWSS Flavobacterium johnsonii UW101 Lifestyle Intracellular symbiont Intracellular symbiont Free-living Habitat Cockroaches Auchenorrhyncha Soil and freshwater Chromosome, bp 636,994 245,530 6,096,872 Plasmid ͓bp͔ 1 ͓3,448͔ 00 G ϩ C content ͓plasmid͔,% 28.2 ͓28.5͔ 22 34 Total CDS 581 227 5,017 Average CDS length, bp 1,031 1,006 1,057 CDS density, % 94 87 87 CDS with assigned function 520 210 3,022 Pseudogenes 4 0 39 rRNAs 3 3 18 tRNAs 33 31 62 General features of the Blattabacterium sp. BPLAN genome compared with those of other completely sequenced Flavobacteriales. CDS, protein coding sequences. a putative oxidoreductase, two ABC transporters, and a bifunc- methionine, and serine, implying that Blattabacterium can make tional sulfate adenyltransferase, harbor internal stop codons and most amino acids from a few substrates, such as glutamate, urea, were annotated as pseudogenes. and ammonia (Fig. 1). Genes involved in asparagine and glu- Overall, 54% of protein-encoding genes with assigned func- tamine biosynthesis are entirely absent. Previous experimental tions are involved in amino acid metabolism, translation and evidence suggests that Blattabacterium generates methionine by biogenesis, cell wall and outer membrane biogenesis, or coen- cysteine transsulfuration (30, 32). Genomic analysis reveals that zyme metabolism and energy production (Table S1). Complete all of the enzymes for methionine biosynthesis by this route are de novo purine and pyrimidine biosynthetic pathways are en- encoded by the genome except for the acetylhomoserine-yielding coded in the Blattabacterium genome. Interestingly, the ribonu- homoserine O-acetyltransferase. Alternatively, cystathionine cleotide reductase (RNR), which performs the necessary reduc- ␥-synthase produces homocysteine using cysteine and O- tion of ribonucleotides to deoxyribonucleotides, is comprised of phosphohomoserine, a threonine biosynthesis metabolite, po- an ␣ subunit that is encoded by a
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