Structural and Biochemical Investigation of PglF from Campylobacter jejuni Reveals a New Mechanism for a Member of the Short Chain Dehydrogenase/Reductase Superfamily
Abstract
Within recent years it has become apparent that protein glycosylation is not limited to eukaryotes. Indeed, in Campylobacter jejuni, a Gram-negative bacterium, more than 60 of its proteins are known to be glycosylated. One of the sugars found in such glycosylated proteins is 2,4-diacetamido-2,4,6-trideoxy-α-d-glucopyranose, hereafter referred to as QuiNAc4NAc. The pathway for its biosynthesis, initiating with UDP-GlcNAc, requires three enzymes referred to as PglF, PglE, and PlgD. The focus of this investigation is on PglF, an NAD+-dependent sugar 4,6-dehydratase known to belong to the short chain dehydrogenase/reductase (SDR) superfamily. Specifically, PglF catalyzes the first step in the pathway, namely, the dehydration of UDP-GlcNAc to UDP-2-acetamido-2,6-dideoxy-α-d-xylo-hexos-4-ulose. Most members of the SDR superfamily contain a characteristic signature sequence of YXXXK where the conserved tyrosine functions as a catalytic acid or a base. Strikingly, in PglF, this residue is a methionine. Here we describe a detailed structural and functional investigation of PglF from C. jejuni. For this investigation five X-ray structures were determined to resolutions of 2.0 Å or better. In addition, kinetic analyses of the wild-type and site-directed variants were performed. Furthermore, on the basis of the data reported herein, a new catalytic mechanism for a SDR superfamily member is proposed thatmore »
- Authors:
-
- Univ. of Wisconsin, Madison, WI (United States)
- National Research Council Canada, Ottawa, ON (Canada)
- Univ. of Missouri, Columbia, MO (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); National Institutes of Health (NIH)
- OSTI Identifier:
- 1409106
- Grant/Contract Number:
- AC02-06CH11357; GM115921
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Biochemistry
- Additional Journal Information:
- Journal Volume: 56; Journal Issue: 45; Journal ID: ISSN 0006-2960
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 59 BASIC BIOLOGICAL SCIENCES; hydroxyls; peptides and proteins; carbohydrates; monomers; chemical structure
Citation Formats
Riegert, Alexander S., Thoden, James B., Schoenhofen, Ian C., Watson, David C., Young, N. Martin, Tipton, Peter A., and Holden, Hazel M. Structural and Biochemical Investigation of PglF from Campylobacter jejuni Reveals a New Mechanism for a Member of the Short Chain Dehydrogenase/Reductase Superfamily. United States: N. p., 2017.
Web. doi:10.1021/acs.biochem.7b00910.
Riegert, Alexander S., Thoden, James B., Schoenhofen, Ian C., Watson, David C., Young, N. Martin, Tipton, Peter A., & Holden, Hazel M. Structural and Biochemical Investigation of PglF from Campylobacter jejuni Reveals a New Mechanism for a Member of the Short Chain Dehydrogenase/Reductase Superfamily. United States. https://doi.org/10.1021/acs.biochem.7b00910
Riegert, Alexander S., Thoden, James B., Schoenhofen, Ian C., Watson, David C., Young, N. Martin, Tipton, Peter A., and Holden, Hazel M. Fri .
"Structural and Biochemical Investigation of PglF from Campylobacter jejuni Reveals a New Mechanism for a Member of the Short Chain Dehydrogenase/Reductase Superfamily". United States. https://doi.org/10.1021/acs.biochem.7b00910. https://www.osti.gov/servlets/purl/1409106.
@article{osti_1409106,
title = {Structural and Biochemical Investigation of PglF from Campylobacter jejuni Reveals a New Mechanism for a Member of the Short Chain Dehydrogenase/Reductase Superfamily},
author = {Riegert, Alexander S. and Thoden, James B. and Schoenhofen, Ian C. and Watson, David C. and Young, N. Martin and Tipton, Peter A. and Holden, Hazel M.},
abstractNote = {Within recent years it has become apparent that protein glycosylation is not limited to eukaryotes. Indeed, in Campylobacter jejuni, a Gram-negative bacterium, more than 60 of its proteins are known to be glycosylated. One of the sugars found in such glycosylated proteins is 2,4-diacetamido-2,4,6-trideoxy-α-d-glucopyranose, hereafter referred to as QuiNAc4NAc. The pathway for its biosynthesis, initiating with UDP-GlcNAc, requires three enzymes referred to as PglF, PglE, and PlgD. The focus of this investigation is on PglF, an NAD+-dependent sugar 4,6-dehydratase known to belong to the short chain dehydrogenase/reductase (SDR) superfamily. Specifically, PglF catalyzes the first step in the pathway, namely, the dehydration of UDP-GlcNAc to UDP-2-acetamido-2,6-dideoxy-α-d-xylo-hexos-4-ulose. Most members of the SDR superfamily contain a characteristic signature sequence of YXXXK where the conserved tyrosine functions as a catalytic acid or a base. Strikingly, in PglF, this residue is a methionine. Here we describe a detailed structural and functional investigation of PglF from C. jejuni. For this investigation five X-ray structures were determined to resolutions of 2.0 Å or better. In addition, kinetic analyses of the wild-type and site-directed variants were performed. Furthermore, on the basis of the data reported herein, a new catalytic mechanism for a SDR superfamily member is proposed that does not require the typically conserved tyrosine residue.},
doi = {10.1021/acs.biochem.7b00910},
journal = {Biochemistry},
number = 45,
volume = 56,
place = {United States},
year = {Fri Oct 20 00:00:00 EDT 2017},
month = {Fri Oct 20 00:00:00 EDT 2017}
}
Web of Science
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