1h98: Difference between revisions
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{{STRUCTURE_1h98| PDB=1h98 | SCENE= }} | |||
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'''NEW INSIGHTS INTO THERMOSTABILITY OF BACTERIAL FERREDOXINS: HIGH RESOLUTION CRYSTAL STRUCTURE OF THE SEVEN-IRON FERREDOXIN FROM THERMUS THERMOPHILUS''' | '''NEW INSIGHTS INTO THERMOSTABILITY OF BACTERIAL FERREDOXINS: HIGH RESOLUTION CRYSTAL STRUCTURE OF THE SEVEN-IRON FERREDOXIN FROM THERMUS THERMOPHILUS''' | ||
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[[Category: Pereira, P J.B.]] | [[Category: Pereira, P J.B.]] | ||
[[Category: Soulimane, T.]] | [[Category: Soulimane, T.]] | ||
[[Category: | [[Category: Azotobacter]] | ||
[[Category: | [[Category: High resolution]] | ||
[[Category: | [[Category: Hydrogen bond]] | ||
[[Category: | [[Category: Iron-sulfur]] | ||
[[Category: | [[Category: Stability]] | ||
[[Category: | [[Category: Thermophilic]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:35:33 2008'' | |||
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Revision as of 15:35, 2 May 2008
NEW INSIGHTS INTO THERMOSTABILITY OF BACTERIAL FERREDOXINS: HIGH RESOLUTION CRYSTAL STRUCTURE OF THE SEVEN-IRON FERREDOXIN FROM THERMUS THERMOPHILUS
Overview
The crystal structure of the seven-iron ferredoxin from Thermus thermophilus (FdTt) has been determined at 1.64 A resolution, allowing us to unveil the common mechanisms of thermostabilization within "bacterial-type" ferredoxins. FdTt and other homologous thermophilic seven-iron ferredoxins are smaller than their mesophilic counterparts. Thermostabilizing features are optimized in a minimal structural and functional unit, with an extensive cross-linking of secondary structure elements mediated by improved polar and hydrophobic interactions. Most of the potentially stabilizing features are focused on the vicinity of the functional [3Fe-4S] cluster. The structural [4Fe-4S] cluster is shielded in thermophilic FdTt by an increased number of polar interactions involving the two N-terminal residues. Comparisons with the hyperthermostable ferredoxin from Thermotoga maritima reveal that (1) a reduction in the number of non-glycine residues in strained conformations, (2) improved polar interactions within the common iron-sulfur cluster binding (betaalphabeta)2 motif, and (3) an optimized charge distribution at the protein surface, constitute a common strategy for increasing the thermal stability of these ferredoxins.
About this Structure
1H98 is a Single protein structure of sequence from Thermus aquaticus. Full crystallographic information is available from OCA.
Reference
New insights into the thermostability of bacterial ferredoxins: high-resolution crystal structure of the seven-iron ferredoxin from Thermus thermophilus., Macedo-Ribeiro S, Martins BM, Pereira PJ, Buse G, Huber R, Soulimane T, J Biol Inorg Chem. 2001 Sep;6(7):663-74. PMID:11681700 Page seeded by OCA on Fri May 2 18:35:33 2008
