THE STRUCTURE OF A THERMALLY STABLE 3-PHOSPHOGLYCERATE KINASE AND A COMPARISON WITH ITS MESOPHILIC EQUIVALENT

被引:83
作者
DAVIES, GJ [1 ]
GAMBLIN, SJ [1 ]
LITTLECHILD, JA [1 ]
WATSON, HC [1 ]
机构
[1] UNIV BRISTOL,SCH MED SCI,DEPT BIOCHEM,BRISTOL BS8 1TD,AVON,ENGLAND
来源
PROTEINS-STRUCTURE FUNCTION AND GENETICS | 1993年 / 15卷 / 03期
关键词
PHOSPHOGLYCERATE KINASE; BACILLUS-STEAROTHERMOPHILUS; CRYSTALLOGRAPHIC STRUCTURE; THERMAL STABILITY; INCREASED HYDROPHOBICITY; HELIX STABILITY;
D O I
10.1002/prot.340150306
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The structure of the phosphoglycerate kinase (PGK) from Bacillus stearothermophilus, a moderate thermophile, has been determined and compared with that of its mesophilic equivalent from yeast. The Bacillus enzyme structure was solved by molecular replacement and improved using constrained rigid-body, molecular dynamics and conventional refinement procedures. The refinement residual, calculated using all the measured data between 8 and 1.65 angstrom, is 0.18(1). The stereo chemical deviations of the final model from ideality are 0.01 angstrom for both bonds and planes. The mid-point temperatures of the Bacillus and yeast enzymes are 67 and 53-degrees-C, respectively. Differential scanning calorimetry indicates that the energy difference (DELTADELTAG) between the mesophilic and thermophilic enzymes is of the order of 5 kcal mol-1 at room temperature. The structure comparison indicates that the features most likely to be responsible for the increased thermal stability of the Bacillus enzyme are the increased internal hydrophobicity, additional ion pairs, and better alpha-helix stability resulting from the removal of helix destablising residues and extra helix-dipole/helix side chain ionic interactions.
引用
收藏
页码:283 / 289
页数:7
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