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Archaea
Volume 2017, Article ID 5395293, 11 pages
https://doi.org/10.1155/2017/5395293
Research Article

Catalytic Intermediate Crystal Structures of Cysteine Desulfurase from the Archaeon Thermococcus onnurineus NA1

1Department of Biological Sciences, Konkuk University, Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
2Department of Life Science, Sangmyung University, 7 Hongji-dong, Jongno-gu, Seoul 03016, Republic of Korea
3Department of Chemistry and Nano Science, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea

Correspondence should be addressed to Lin-Woo Kang; rk.ca.kuknok@gnakl

Received 12 October 2016; Accepted 19 February 2017; Published 24 April 2017

Academic Editor: Mohamed Jebbar

Copyright © 2017 Thien-Hoang Ho et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Thermococcus onnurineus NA1 is an anaerobic archaeon usually found in a deep-sea hydrothermal vent area, which can use elemental sulfur (S0) as a terminal electron acceptor for energy. Sulfur, essential to many biomolecules such as sulfur-containing amino acids and cofactors including iron-sulfur cluster, is usually mobilized from cysteine by the pyridoxal 5′-phosphate- (PLP-) dependent enzyme of cysteine desulfurase (CDS). We determined the crystal structures of CDS from Thermococcus onnurineus NA1 (ToCDS), which include native internal aldimine (NAT), gem-diamine (GD) with alanine, internal aldimine structure with existing alanine (IAA), and internal aldimine with persulfide-bound Cys356 (PSF) structures. The catalytic intermediate structures showed the dihedral angle rotation of Schiff-base linkage relative to the PLP pyridine ring. The ToCDS structures were compared with bacterial CDS structures, which will help us to understand the role and catalytic mechanism of ToCDS in the archaeon Thermococcus onnurineus NA1.