1igs
From Proteopedia
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'''INDOLE-3-GLYCEROLPHOSPHATE SYNTHASE FROM SULFOLOBUS SOLFATARICUS AT 2.0 A RESOLUTION''' | '''INDOLE-3-GLYCEROLPHOSPHATE SYNTHASE FROM SULFOLOBUS SOLFATARICUS AT 2.0 A RESOLUTION''' | ||
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[[Category: Jansonius, J N.]] | [[Category: Jansonius, J N.]] | ||
[[Category: Kirschner, K.]] | [[Category: Kirschner, K.]] | ||
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| - | [[Category: | + | [[Category: Thermostable]] |
| - | [[Category: | + | [[Category: Tim-barrel]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:58:48 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 16:58, 2 May 2008
INDOLE-3-GLYCEROLPHOSPHATE SYNTHASE FROM SULFOLOBUS SOLFATARICUS AT 2.0 A RESOLUTION
Overview
BACKGROUND: Recent efforts to understand the basis of protein stability have focused attention on comparative studies of proteins from hyperthermophilic and mesophilic organisms. Most work to date has been on either oligomeric enzymes or monomers comprising more than one domain. Such studies are hampered by the need to distinguish between stabilizing interactions acting between subunits or domains from those acting within domains. In order to simplify the search for determinants of protein stability we have chosen to study the monomeric enzyme indole-3-glycerol phosphate synthase from the hyperthermophilic archaeon Sulfolobus solfataricus (sIGPS), which grows optimally at 90 degrees C. RESULTS: The 2.0 A crystal structure of sIGPS was determined and compared with the known 2.0 A structure of the IGPS domain of the bifunctional enzyme from the mesophilic bacterium Escherichia coli (eIGPS). sIGPS and eIGPS have only 30% sequence identity, but share high structural similarity. Both are single-domain (beta/alpha)8 barrel proteins, with one (eIGPS) or two (sIGPS) additional helices inserted before the first beta strand. The thermostable sIGPS has many more salt bridges than eIGPS. Several salt bridges crosslink adjacent alpha helices or participate in triple or quadruple salt-bridge clusters. The number of helix capping, dipole stabilizing and hydrophobic interactions is also increased in sIGPS. CONCLUSIONS: The higher stability of sIGPS compared with eIGPS seems to be the result of several improved interactions. These include a larger number of salt bridges, stabilization of alpha helices and strengthening of both polypeptide chain termini and solvent-exposed loops.
About this Structure
1IGS is a Single protein structure of sequence from Sulfolobus solfataricus. Full crystallographic information is available from OCA.
Reference
2.0 A structure of indole-3-glycerol phosphate synthase from the hyperthermophile Sulfolobus solfataricus: possible determinants of protein stability., Hennig M, Darimont B, Sterner R, Kirschner K, Jansonius JN, Structure. 1995 Dec 15;3(12):1295-306. PMID:8747456 Page seeded by OCA on Fri May 2 19:58:48 2008
