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In vitro biosynthesis of UDP-N,N'-diacetylbacillosamine by enzymes of the Campylobacter jejuni general protein glycosylation system.

Abstract：

:In Campylobacter jejuni 2,4-diacetamido-2,4,6-trideoxy-alpha-d-glucopyranose, termed N,N'-diacetylbacillosamine (Bac2,4diNAc), is the first carbohydrate in the glycoprotein N-linked heptasaccharide. With uridine diphosphate-N-acetylglucosamine (UDP-GlcNAc) as a starting point, two enzymes of the general protein glycosylation (Pgl) pathway in C. jejuni (PglF and PglE) have recently been shown to modify this sugar nucleotide to form UDP-2-acetamido-4-amino-2,4,6-trideoxy-alpha-d-glycopyranose (UDP-4-amino-sugar) [Schoenhofen, I. C., et al. (2006) J. Biol. Chem. 281, 723-732]. PglD has been proposed to catalyze the final step in N,N'-diacetylbacillosamine synthesis by N-acetylation of the UDP-4-amino-sugar at the C4 position. We have cloned, overexpressed, and purified PglD from the pgl locus of C. jejuni NCTC 11168 and identified it as the acetyltransferase that modifies the UDP-4-amino-sugar to form UDP-N,N'-diacetylbacillosamine, utilizing acetyl-coenzyme A as the acetyl group donor. The UDP-N,N'-diacetylbacillosamine product was purified from the reaction by reverse phase C18 HPLC and the structure determined by NMR analysis. Additionally, the full-length PglF was overexpressed and purified in the presence of detergent as a GST fusion protein, allowing for derivation of kinetic parameters. We found that the UDP-4-amino-sugar was readily synthesized from UDP-GlcNAc in a coupled reaction using PglF and PglE. We also demonstrate the in vitro biosynthesis of the complete heptasaccharide lipid-linked donor by coupling the action of eight enzymes (PglF, PglE, PglD, PglC, PglA, PglJ, PglH, and PglI) in the Pgl pathway in a single reaction vessel.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Olivier NB,Chen MM,Behr JR,Imperiali B

doi

10.1021/bi061456h

subject

Has Abstract

pub_date

2006-11-14 00:00:00

pages

13659-69

issue

45

eissn

0006-2960

issn

1520-4995

journal_volume

45

pub_type

杂志文章

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