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Title: Structure of Pseudomonas aeruginosa spermidine dehydrogenase: a polyamine oxidase with a novel heme‐binding fold

Abstract

The opportunistic pathogen Pseudomonas aeruginosa can utilize polyamines (including putrescine, cadaverine, 4‐aminobutyrate, spermidine, and spermine) as its sole source of carbon and nitrogen. Spermidine dehydrogenase (SpdH) is a component of one of the two polyamine utilization pathways identified in P .  aeruginosa , but little is known about its structure and function. Here, we report the first crystal structure of SpdH from P .  aeruginosa to 1.85 Å resolution. The resulting core structure confirms that SpdH belongs to the polyamine oxidase (PAO) family with flavin‐binding and substrate‐binding domains. A unique N‐terminal extension wraps around the flavin‐binding domain of SpdH and is required for heme binding, placing a heme cofactor in close proximity to the FAD cofactor. Structural and mutational analysis reveals that residues in the putative active site at the re side of the FAD isoalloxazine ring form part of the catalytic machinery. PaSpdH features an unusual active site and lacks the conserved lysine that forms part of a lysine–water–flavin N5 atom interaction in other PAO enzymes characterized to date. Mutational analysis further confirms that heme is required for catalytic activity. This work provides an important starting point for understanding the role of SpdH, which occurs universally in P .  aeruginosa strains,more » in polyamine metabolism.« less

Authors:
 [1];  [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. State Key Laboratory of Medicinal Chemical Biology Nankai International Advanced Research Institute (Shenzhen Futian) College of Life Sciences Nankai University Tianjin China
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1830449
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Federation of European Biochemical Societies (FEBS) Journal
Additional Journal Information:
Journal Name: Federation of European Biochemical Societies (FEBS) Journal Journal Volume: 289 Journal Issue: 7; Journal ID: ISSN 1742-464X
Publisher:
Wiley-Blackwell
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Che, Shiyou, Liang, Yakun, Chen, Yujing, Wu, Wenyue, Liu, Ruihua, Zhang, Qionglin, and Bartlam, Mark. Structure of Pseudomonas aeruginosa spermidine dehydrogenase: a polyamine oxidase with a novel heme‐binding fold. United Kingdom: N. p., 2021. Web. doi:10.1111/febs.16264.
Che, Shiyou, Liang, Yakun, Chen, Yujing, Wu, Wenyue, Liu, Ruihua, Zhang, Qionglin, & Bartlam, Mark. Structure of Pseudomonas aeruginosa spermidine dehydrogenase: a polyamine oxidase with a novel heme‐binding fold. United Kingdom. https://doi.org/10.1111/febs.16264
Che, Shiyou, Liang, Yakun, Chen, Yujing, Wu, Wenyue, Liu, Ruihua, Zhang, Qionglin, and Bartlam, Mark. Tue . "Structure of Pseudomonas aeruginosa spermidine dehydrogenase: a polyamine oxidase with a novel heme‐binding fold". United Kingdom. https://doi.org/10.1111/febs.16264.
@article{osti_1830449,
title = {Structure of Pseudomonas aeruginosa spermidine dehydrogenase: a polyamine oxidase with a novel heme‐binding fold},
author = {Che, Shiyou and Liang, Yakun and Chen, Yujing and Wu, Wenyue and Liu, Ruihua and Zhang, Qionglin and Bartlam, Mark},
abstractNote = {The opportunistic pathogen Pseudomonas aeruginosa can utilize polyamines (including putrescine, cadaverine, 4‐aminobutyrate, spermidine, and spermine) as its sole source of carbon and nitrogen. Spermidine dehydrogenase (SpdH) is a component of one of the two polyamine utilization pathways identified in P .  aeruginosa , but little is known about its structure and function. Here, we report the first crystal structure of SpdH from P .  aeruginosa to 1.85 Å resolution. The resulting core structure confirms that SpdH belongs to the polyamine oxidase (PAO) family with flavin‐binding and substrate‐binding domains. A unique N‐terminal extension wraps around the flavin‐binding domain of SpdH and is required for heme binding, placing a heme cofactor in close proximity to the FAD cofactor. Structural and mutational analysis reveals that residues in the putative active site at the re side of the FAD isoalloxazine ring form part of the catalytic machinery. PaSpdH features an unusual active site and lacks the conserved lysine that forms part of a lysine–water–flavin N5 atom interaction in other PAO enzymes characterized to date. Mutational analysis further confirms that heme is required for catalytic activity. This work provides an important starting point for understanding the role of SpdH, which occurs universally in P .  aeruginosa strains, in polyamine metabolism.},
doi = {10.1111/febs.16264},
journal = {Federation of European Biochemical Societies (FEBS) Journal},
number = 7,
volume = 289,
place = {United Kingdom},
year = {Tue Nov 16 00:00:00 EST 2021},
month = {Tue Nov 16 00:00:00 EST 2021}
}

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