Homospermidine biosynthesis in the cyanobacterium Anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth
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, N2‐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 diazotrophic growth. Heterocyst differentiation in the speA mutant was blocked at an early step, after induction of the regulatory gene hetR but before production of heterocyst‐specific glycolipids (HGL). In contrast, the speY mutant produced HGL and showed slow diazotrophic growth. Analysis of fusions to green fluorescent protein revealed that SpeA (like SpeB previously described) accumulates at higher levels in vegetative cells than in heterocysts, and that SpeY accumulates in vegetative cells but also at significant levels in heterocysts. The homospermidine biosynthetic pathway is therefore active primarily in vegetative cells but the last step can be completed in heterocysts. Our findings indicate an important role for polyamines in the diazotrophic biology of Anabaena. Furthermore, inactivation of a gene cluster (potADB) encoding a polyamine ABC transporter disrupted diazotrophic growth, corroborating the importance of polyamine homeostasis in Anabaena.
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Blackwell Publishing
2018-09
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Subjects: | Heterocyst differentiation, Homospermidine biosynthesis, Nitrogen fixation, Polyamines., Cyanobacteria, |
Online Access: | http://hdl.handle.net/10261/173217 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/100007914 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100011033 |
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dig-icm-es-10261-1732172020-12-13T08:45:38Z Homospermidine biosynthesis in the cyanobacterium Anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth Burnat, Mireia Li, Bin Kim, Sok-Ho Michael, Anthony J. Flores, Enrique European Commission Agencia Estatal de Investigación (España) Ministerio de Economía y Competitividad (España) Ministerio de Ciencia, Innovación y Universidades (España) University of Texas Southwestern Medical Center Heterocyst differentiation Homospermidine biosynthesis Nitrogen fixation Polyamines. Cyanobacteria 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, N2‐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 diazotrophic growth. Heterocyst differentiation in the speA mutant was blocked at an early step, after induction of the regulatory gene hetR but before production of heterocyst‐specific glycolipids (HGL). In contrast, the speY mutant produced HGL and showed slow diazotrophic growth. Analysis of fusions to green fluorescent protein revealed that SpeA (like SpeB previously described) accumulates at higher levels in vegetative cells than in heterocysts, and that SpeY accumulates in vegetative cells but also at significant levels in heterocysts. The homospermidine biosynthetic pathway is therefore active primarily in vegetative cells but the last step can be completed in heterocysts. Our findings indicate an important role for polyamines in the diazotrophic biology of Anabaena. Furthermore, inactivation of a gene cluster (potADB) encoding a polyamine ABC transporter disrupted diazotrophic growth, corroborating the importance of polyamine homeostasis in Anabaena. Work was supported by grants number BFU2014‐56757‐P and BFU2017‐88202‐P from Agencia Estatal de Investigación, Spain, co‐financed by the European Regional Development Grant (EF) and by a seed grant from UT Southwestern Medical Center (AJM). Peer Reviewed 2018-12-14T09:17:19Z 2018-12-14T09:17:19Z 2018-09 2018-12-14T09:17:19Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1111/mmi.14006 issn: 0950-382X Molecular Microbiology 109(6): 763-780 (2018) http://hdl.handle.net/10261/173217 10.1111/mmi.14006 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/100007914 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100011033 #PLACEHOLDER_PARENT_METADATA_VALUE# #PLACEHOLDER_PARENT_METADATA_VALUE# #PLACEHOLDER_PARENT_METADATA_VALUE# BFU2017‐88202‐P/AEI/10.13039/501100011033 info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/BFU2014‐56757‐P info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/BFU2017‐88202‐P Postprint http://doi.org/10.1111/mmi.14006 Sí open Blackwell Publishing |
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Heterocyst differentiation Homospermidine biosynthesis Nitrogen fixation Polyamines. Cyanobacteria Heterocyst differentiation Homospermidine biosynthesis Nitrogen fixation Polyamines. Cyanobacteria |
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Heterocyst differentiation Homospermidine biosynthesis Nitrogen fixation Polyamines. Cyanobacteria Heterocyst differentiation Homospermidine biosynthesis Nitrogen fixation Polyamines. Cyanobacteria Burnat, Mireia Li, Bin Kim, Sok-Ho Michael, Anthony J. Flores, Enrique Homospermidine biosynthesis in the cyanobacterium Anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth |
description |
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, N2‐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 diazotrophic growth. Heterocyst differentiation in the speA mutant was blocked at an early step, after induction of the regulatory gene hetR but before production of heterocyst‐specific glycolipids (HGL). In contrast, the speY mutant produced HGL and showed slow diazotrophic growth. Analysis of fusions to green fluorescent protein revealed that SpeA (like SpeB previously described) accumulates at higher levels in vegetative cells than in heterocysts, and that SpeY accumulates in vegetative cells but also at significant levels in heterocysts. The homospermidine biosynthetic pathway is therefore active primarily in vegetative cells but the last step can be completed in heterocysts. Our findings indicate an important role for polyamines in the diazotrophic biology of Anabaena. Furthermore, inactivation of a gene cluster (potADB) encoding a polyamine ABC transporter disrupted diazotrophic growth, corroborating the importance of polyamine homeostasis in Anabaena. |
author2 |
European Commission |
author_facet |
European Commission Burnat, Mireia Li, Bin Kim, Sok-Ho Michael, Anthony J. Flores, Enrique |
format |
artículo |
topic_facet |
Heterocyst differentiation Homospermidine biosynthesis Nitrogen fixation Polyamines. Cyanobacteria |
author |
Burnat, Mireia Li, Bin Kim, Sok-Ho Michael, Anthony J. Flores, Enrique |
author_sort |
Burnat, Mireia |
title |
Homospermidine biosynthesis in the cyanobacterium Anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth |
title_short |
Homospermidine biosynthesis in the cyanobacterium Anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth |
title_full |
Homospermidine biosynthesis in the cyanobacterium Anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth |
title_fullStr |
Homospermidine biosynthesis in the cyanobacterium Anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth |
title_full_unstemmed |
Homospermidine biosynthesis in the cyanobacterium Anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth |
title_sort |
homospermidine biosynthesis in the cyanobacterium anabaena requires a deoxyhypusine synthase homologue and is essential for normal diazotrophic growth |
publisher |
Blackwell Publishing |
publishDate |
2018-09 |
url |
http://hdl.handle.net/10261/173217 http://dx.doi.org/10.13039/501100003329 http://dx.doi.org/10.13039/100007914 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100011033 |
work_keys_str_mv |
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1777666836595212288 |