2018
DOI: 10.1111/mmi.14006
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Homospermidine biosynthesis in the cyanobacterium Anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth

Abstract: Polyamines are primordial, small organic polycations present in almost all cells, but their roles in bacteria are poorly understood. sym-Homospermidine is the dominant polyamine in the filamentous, N -fixing, heterocyst-forming cyanobacterium Anabaena sp. PCC 7120. Synthesis of homospermidine was dependent on speA (encoding arginine decarboxylase), speB (agmatinase) and speY (deoxyhypusine synthase homologue), which in bacteria is an unprecedented pathway. Inactivation of any of these genes impaired diazotroph… Show more

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Cited by 26 publications
(39 citation statements)
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“…We have recently described a pathway producing sym ‐homospermidine from arginine in Anabaena (Burnat et al , ). The first enzyme in this pathway is arginine decarboxylase encoded by speA ( all3401 ), and an speA mutant is drastically hampered in diazotrophic growth apparently because of a requirement for polyamines during heterocyst differentiation (Burnat et al , ). Here, we studied the growth rate constants of the agrE and putA mutants in liquid medium.…”
Section: Resultsmentioning
confidence: 99%
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“…We have recently described a pathway producing sym ‐homospermidine from arginine in Anabaena (Burnat et al , ). The first enzyme in this pathway is arginine decarboxylase encoded by speA ( all3401 ), and an speA mutant is drastically hampered in diazotrophic growth apparently because of a requirement for polyamines during heterocyst differentiation (Burnat et al , ). Here, we studied the growth rate constants of the agrE and putA mutants in liquid medium.…”
Section: Resultsmentioning
confidence: 99%
“…Our work has identified in the heterocyst-forming cyanobacterium Anabaena an arginine catabolism pathway that produces glutamate mediated by the products of only two genes, agrE (alr4995 in the Anabaena genome) and putA (alr0540). Figure 10 depicts this pathway along with the homospermidine biosynthesis pathway that we have recently described in Anabaena (Burnat et al, 2018). Among the pathways that catabolize arginine producing glutamate and ammonium, the use of ornithine as an intermediate is common.…”
Section: Discussionmentioning
confidence: 99%
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“…Although the mechanisms of assimilation of organic N have not been investigated in detail, some relevant pathways can be predicted or have been approached experimentally. Thus, (i) glutamine utilization likely involves GOGAT (described above); (ii) arginine utilization appears to take place through two pathways, including an arginine decarboxylase pathway that synthesizes polyamines (Burnat et al ., ) and an arginine ➔ proline ➔ glutamate pathway (Burnat and Flores, ) and (iii) urea utilization involves urease that hydrolyzes urea to CO 2 and two molecules of ammonium (Valladares et al ., ).…”
Section: Assimilation Of Combined N Sources Alternative To Ammoniummentioning
confidence: 99%
“…These two amino acids, especially the nitrogen-rich arginine, must be catabolized to make their nitrogen atoms available for cyanobacterial metabolism. Arginine can be used for synthesis of cyanophycin and serve as a precursor for synthesis of biomass components (protein) and polyamines (putrescine, spermidine and spermine) (Cunin et al, 1986;Schriek et al, 2007;Burnat, Li et al, 2018). Thus arginine metabolism plays a key role in nitrogen storage and mobilization in cyanobacteria.…”
mentioning
confidence: 99%