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2020 ◽  
Vol 101 ◽  
pp. 104024
Author(s):  
Thanh K. Pham ◽  
Young-Woo Kim
Keyword(s):  

2016 ◽  
Vol 37 (4) ◽  
pp. 566-570 ◽  
Author(s):  
Luong Thuy Nguyen ◽  
Huy Xuan Luong ◽  
Young-Woo Kim

2006 ◽  
Vol 394 (1) ◽  
pp. 11-17 ◽  
Author(s):  
Nerino Allocati ◽  
Michele Masulli ◽  
Marilena Pietracupa ◽  
Luca Federici ◽  
Carmine Di Ilio

The bacterium Proteus mirabilis expresses a cytosolic class beta glutathione S-transferase (PmGST B1-1) that is part of a family of multifunctional detoxication enzymes. Like other cytosolic GSTs, PmGST B1-1 possesses two local structural motifs, an N-capping box and a hydrophobic staple motif, both of which are located between amino acids 151 and 156. The N-capping box consists of a reciprocal hydrogen bonding interaction of Thr152 with Asp155, whereas the hydrophobic staple motif consists of a hydrophobic interaction between Phe151 and Ala156. By contrast with other GSTs, PmGST B1-1 displays distinct hydrogen bond interactions in the N-capping box. In mammalian GSTs these structural elements are critical for protein folding and stability. To investigate the role played by these two motifs in a distantly related organism on the evolutionary scale, site-directed mutagenesis was used to generate several mutants of both motifs in PmGST B1-1. All mutants were efficiently overexpressed and purified, but they were quite unstable, although at different levels, indicating that protein folding was significantly destabilized. The analysis of the T152A and D155G variants indicated that the N-capping box motif plays an important role in the stability and correct folding of the enzyme. The analysis of F151A and A156G mutants revealed that the hydrophobic staple motif influences the structural maintenance of the protein and is implicated in the folding process of PmGST B1-1. Finally, the replacement of Thr152 and Asp155, as well as Phe151 and Ala156 residues influences the catalytic efficiency of the enzyme.


2001 ◽  
Vol 276 (34) ◽  
pp. 32177-32183 ◽  
Author(s):  
Roberta Cocco ◽  
Gun Stenberg ◽  
Beatrice Dragani ◽  
Daniela Rossi Principe ◽  
Domenico Paludi ◽  
...  

2001 ◽  
pp. 350-352
Author(s):  
Toshimasa Yamazaki ◽  
Etsuko Katoh ◽  
Tomohisa Hatta ◽  
Teruhisa Tomari ◽  
Sakurako Tashiro ◽  
...  
Keyword(s):  

1997 ◽  
Vol 272 (41) ◽  
pp. 25518-25523 ◽  
Author(s):  
Beatrice Dragani ◽  
Gun Stenberg ◽  
Sonia Melino ◽  
Raffaele Petruzzelli ◽  
Bengt Mannervik ◽  
...  
Keyword(s):  

1997 ◽  
Vol 322 (1) ◽  
pp. 229-234 ◽  
Author(s):  
Antonio ACETO ◽  
Beatrice DRAGANI ◽  
Sonia MELINO ◽  
Nerino ALLOCATI ◽  
Michele MASULLI ◽  
...  

We have identified an N-capping box motif (Ser/Thr-Xaa-Xaa-Asp) that is strictly conserved, at the beginning of α6 helix, in all glutathione S-transferases (GSTs) and most of the related superfamily proteins. By using CD and peptide modelling we have demonstrated that the capping box residues have an important role in determining the helical conformation adopted by this fragment in the hydrophobic environment of the protein. This is an example in which a local motif, contributing to nucleation of a structural element essential to the global folding of the protein, is strictly conserved in a superfamily of homologous proteins.


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