Identification of the D-glucuronyl C5-epimerase that introduces iduronic acid into N-linked glycans decorating archaeal glycoproteins
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View abstract on PubMed
Summary
This summary is machine-generated.The first D-glucuronyl C5-epimerase (VNG1058H) in Archaea was identified in Halobacterium salinarum. Its absence alters N-linked glycosylation and cell physiology, indicating its crucial role.
Area Of Science
- Biochemistry
- Microbiology
- Glycobiology
Background
- Halobacterium salinarum utilizes N-linked glycosylation with a unique tetrasaccharide containing iduronic acid (IdoA).
- IdoA is typically found in eukaryal glycosaminoglycans, making its presence in archaeal N-glycosylation unusual.
- The enzyme responsible for converting glucuronic acid (GlcA) to IdoA in this pathway was previously unknown.
Purpose Of The Study
- To identify the epimerase enzyme responsible for IdoA synthesis in Halobacterium salinarum.
- To investigate the function of this epimerase in N-linked glycosylation and cell physiology.
- To explore the regulation of the epimerase gene in response to environmental conditions.
Main Methods
- In silico analysis to predict the epimerase function of VNG1058H.
- Gene deletion studies in Hbt. salinarum to analyze the effects of VNG1058H absence.
- Analysis of N-linked tetrasaccharide composition and sulfation levels.
- Gene transcription analysis under varying growth temperatures.
Main Results
- VNG1058H was identified as the D-glucuronyl C5-epimerase responsible for IdoA synthesis.
- Deletion of VNG1058H resulted in the replacement of IdoA with GlcA in the N-linked tetrasaccharide.
- Reduced sulfation of the tetrasaccharide and altered cell physiology were observed in the VNG1058H deletion mutant.
- VNG1058H expression is differentially regulated by growth temperature, suggesting environmental responsiveness.
Conclusions
- VNG1058H is the first archaeal D-glucuronyl C5-epimerase, crucial for IdoA biosynthesis in Hbt. salinarum N-glycosylation.
- The epimerase plays a significant role in modifying the N-linked tetrasaccharide and impacts cell physiology.
- Differential transcription of VNG1058H indicates its involvement in adapting to environmental changes, such as temperature shifts.
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