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The crystal structure of triosephosphate isomerase (TIM) from Thermotoga maritima: a comparative thermostability structural analysis of ten different TIM structures
Maes, Dominique; Zeelen, Johan P.; Thanki, Narmada et al.
1999In Proteins, 37 (3), p. 441-53
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Keywords :
Amino Acid Sequence; Crystallography, X-Ray; Heating; Models, Molecular; Molecular Sequence Data; Molecular Structure; Protein Structure, Secondary; Sequence Alignment; Thermotoga maritima/*chemistry; Triose-Phosphate Isomerase/*chemistry
Abstract :
[en] The molecular mechanisms that evolution has been employing to adapt to environmental temperatures are poorly understood. To gain some further insight into this subject we solved the crystal structure of triosephosphate isomerase (TIM) from the hyperthermophilic bacterium Thermotoga maritima (TmTIM). The enzyme is a tetramer, assembled as a dimer of dimers, suggesting that the tetrameric wild-type phosphoglycerate kinase PGK-TIM fusion protein consists of a core of two TIM dimers covalently linked to 4 PGK units. The crystal structure of TmTIM represents the most thermostable TIM presently known in its 3D-structure. It adds to a series of nine known TIM structures from a wide variety of organisms, spanning the range from psychrophiles to hyperthermophiles. Several properties believed to be involved in the adaptation to different temperatures were calculated and compared for all ten structures. No sequence preferences, correlated with thermal stability, were apparent from the amino acid composition or from the analysis of the loops and secondary structure elements of the ten TIMs. A common feature for both psychrophilic and T. maritima TIM is the large number of salt bridges compared with the number found in mesophilic TIMs. In the two thermophilic TIMs, the highest amount of accessible hydrophobic surface is buried during the folding and assembly process.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Maes, Dominique;  Vrije Universiteit Brussel > Vlaams Interuniversitair Instituut voor Biotechnologie
Zeelen, Johan P.;  European Molecular Biology Laboratory
Thanki, Narmada;  European Molecular Biology Laboratory
Beaucamp, Nicola;  Universität Regensburg > Institut für Biophysik und physikalische Biochemie
Alvarez, Marco
Thi, Minh Hoa Dao;  Vrije Universiteit Brussel > Vlaams Interuniversitair Instituut voor Biotechnologie
Backmann, Jan;  Vrije Universiteit Brussel > Vlaams Interuniversitair Instituut voor Biotechnologie
Martial, Joseph ;  Université de Liège - ULiège > Département des sciences de la vie > GIGA-R : Biologie et génétique moléculaire
Wyns, Lode;  Vrije Universiteit Brussel > Vlaams Interuniversitair Instituut voor Biotechnologie
Jaenicke, Rainer;  Universität Regensburg > Institut für Biophysik und physikalische Biochemie
Wierenga, Rik K.;  European Molecular Biology Laboratory
Language :
English
Title :
The crystal structure of triosephosphate isomerase (TIM) from Thermotoga maritima: a comparative thermostability structural analysis of ten different TIM structures
Publication date :
1999
Journal title :
Proteins
ISSN :
0887-3585
eISSN :
1097-0134
Publisher :
Wiley Liss, Inc., New York, United States - New York
Volume :
37
Issue :
3
Pages :
441-53
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 August 2009

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