Glycolipid composition of the heterocyst envelope of Anabaena sp. PCC 7120 is crucial for diazotrophic growth and relies on the UDP-galactose 4-epimerase HgdA.
Anabaenasp. PCC 7120
HgdA
cyanobacterium
epimerase
glycolipids
heterocyst differentiation
Journal
MicrobiologyOpen
ISSN: 2045-8827
Titre abrégé: Microbiologyopen
Pays: England
ID NLM: 101588314
Informations de publication
Date de publication:
08 2019
08 2019
Historique:
received:
10
12
2018
revised:
10
01
2019
accepted:
14
01
2019
pubmed:
26
2
2019
medline:
17
4
2020
entrez:
26
2
2019
Statut:
ppublish
Résumé
The nitrogenase complex in the heterocysts of the filamentous freshwater cyanobacterium Anabaenasp. PCC 7120 fixes atmospheric nitrogen to allow diazotrophic growth. The heterocyst cell envelope protects the nitrogenase from oxygen and consists of a polysaccharide and a glycolipid layer that are formed by a complex process involving the recruitment of different proteins. Here, we studied the function of the putative nucleoside-diphosphate-sugar epimerase HgdA, which along with HgdB and HgdC is essential for deposition of the glycolipid layer and growth without a combined nitrogen source. Using site-directed mutagenesis and single homologous recombination approach, we performed a thoroughly functional characterization of HgdA and confirmed that the glycolipid layer of the hgdAmutant heterocyst is aberrant as shown by transmission electron microscopy and chemical analysis. The hgdA gene was expressed during late stages of the heterocyst differentiation. GFP-tagged HgdA protein localized inside the heterocysts. The purified HgdA protein had UDP-galactose 4-epimerase activity in vitro. This enzyme could be responsible for synthesis of heterocyst-specific glycolipid precursors, which could be transported over the cell wall by the ABC transporter components HgdB/HgdC.
Identifiants
pubmed: 30803160
doi: 10.1002/mbo3.811
pmc: PMC6692557
doi:
Substances chimiques
Glycolipids
0
UDPglucose 4-Epimerase
EC 5.1.3.2
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e00811Informations de copyright
© 2019 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd.
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