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Citrate synthase from Thermus aquaticus: a thermostable bacterial enzyme with a five-membered inter-subunit ionic network.

Nordberg Karlsson, Eva LU ; Crenell, S J; Higgins, C; Nawaz, S; Yeoh, L; Hough, D W and Danson, M J (2003) In Extremophiles 7(1). p.9-16
Abstract
A bacterial thermostable citrate synthase has been analyzed to investigate the structural basis of its thermostability, and to compare such features with those previously identified in archaeal citrate synthases. The gene encoding the citrate synthase from Thermus aquaticus was identified from a gene library by screening with a PCR fragment amplified from genomic DNA using a primer based on the determined N-terminal amino acid sequence and a citrate synthase consensus primer. Apart from high sequence similarities with citrate synthase sequences within the Thermus/Deinococcus group, the analyzed enzyme has highest similarities with the enzyme from the hyperthermophilic Archaeon Pyrococcus furiosus. The recombinant enzyme is a dimer with... (More)
A bacterial thermostable citrate synthase has been analyzed to investigate the structural basis of its thermostability, and to compare such features with those previously identified in archaeal citrate synthases. The gene encoding the citrate synthase from Thermus aquaticus was identified from a gene library by screening with a PCR fragment amplified from genomic DNA using a primer based on the determined N-terminal amino acid sequence and a citrate synthase consensus primer. Apart from high sequence similarities with citrate synthase sequences within the Thermus/Deinococcus group, the analyzed enzyme has highest similarities with the enzyme from the hyperthermophilic Archaeon Pyrococcus furiosus. The recombinant enzyme is a dimer with high specific activity. Compared to its thermoactivity (Topt at 80°C), the thermal stability of the enzyme is high, as judged from its Tm (101°C), and from irreversible thermal inactivation assays. Molecular modeling of the structure revealed an inter-subunit ion-pair network, comparable in size to the network found in the citrate synthase from P. furiosus; these networks are discussed in relation to the high thermal stability of these bacterial and archaeal enzymes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Extremophiles
volume
7
issue
1
pages
9 - 16
publisher
Springer
external identifiers
  • wos:000181259200002
  • scopus:0038049070
ISSN
1433-4909
DOI
10.1007/s00792-002-0290-7
language
English
LU publication?
yes
id
1ebb7d8e-f841-4330-8220-2d334e5f5cde (old id 129248)
date added to LUP
2007-07-02 15:47:10
date last changed
2017-01-01 04:34:09
@article{1ebb7d8e-f841-4330-8220-2d334e5f5cde,
  abstract     = {A bacterial thermostable citrate synthase has been analyzed to investigate the structural basis of its thermostability, and to compare such features with those previously identified in archaeal citrate synthases. The gene encoding the citrate synthase from Thermus aquaticus was identified from a gene library by screening with a PCR fragment amplified from genomic DNA using a primer based on the determined N-terminal amino acid sequence and a citrate synthase consensus primer. Apart from high sequence similarities with citrate synthase sequences within the Thermus/Deinococcus group, the analyzed enzyme has highest similarities with the enzyme from the hyperthermophilic Archaeon Pyrococcus furiosus. The recombinant enzyme is a dimer with high specific activity. Compared to its thermoactivity (Topt at 80°C), the thermal stability of the enzyme is high, as judged from its Tm (101°C), and from irreversible thermal inactivation assays. Molecular modeling of the structure revealed an inter-subunit ion-pair network, comparable in size to the network found in the citrate synthase from P. furiosus; these networks are discussed in relation to the high thermal stability of these bacterial and archaeal enzymes.},
  author       = {Nordberg Karlsson, Eva and Crenell, S J and Higgins, C and Nawaz, S and Yeoh, L and Hough, D W and Danson, M J},
  issn         = {1433-4909},
  language     = {eng},
  number       = {1},
  pages        = {9--16},
  publisher    = {Springer},
  series       = {Extremophiles},
  title        = {Citrate synthase from Thermus aquaticus: a thermostable bacterial enzyme with a five-membered inter-subunit ionic network.},
  url          = {http://dx.doi.org/10.1007/s00792-002-0290-7},
  volume       = {7},
  year         = {2003},
}