1gru: Difference between revisions
New page: left|200px<br /><applet load="1gru" size="450" color="white" frame="true" align="right" spinBox="true" caption="1gru, resolution 12.5Å" /> '''SOLUTION STRUCTURE O... |
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[[Image:1gru.gif|left|200px]]<br /><applet load="1gru" size=" | [[Image:1gru.gif|left|200px]]<br /><applet load="1gru" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1gru, resolution 12.5Å" /> | caption="1gru, resolution 12.5Å" /> | ||
'''SOLUTION STRUCTURE OF GROES-ADP7-GROEL-ATP7 COMPLEX BY CRYO-EM'''<br /> | '''SOLUTION STRUCTURE OF GROES-ADP7-GROEL-ATP7 COMPLEX BY CRYO-EM'''<br /> | ||
==Overview== | ==Overview== | ||
The chaperonin GroEL drives its protein-folding cycle by cooperatively | The chaperonin GroEL drives its protein-folding cycle by cooperatively binding ATP to one of its two rings, priming that ring to become folding-active upon GroES binding, while simultaneously discharging the previous folding chamber from the opposite ring. The GroEL-ATP structure, determined by cryo-EM and atomic structure fitting, shows that the intermediate domains rotate downward, switching their intersubunit salt bridge contacts from substrate binding to ATP binding domains. These observations, together with the effects of ATP binding to a GroEL-GroES-ADP complex, suggest structural models for the ATP-induced reduction in affinity for polypeptide and for cooperativity. The model for cooperativity, based on switching of intersubunit salt bridge interactions around the GroEL ring, may provide general insight into cooperativity in other ring complexes and molecular machines. | ||
==About this Structure== | ==About this Structure== | ||
1GRU is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http:// | 1GRU is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GRU OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Farr, G | [[Category: Farr, G W.]] | ||
[[Category: Fenton, W | [[Category: Fenton, W A.]] | ||
[[Category: Gowen, B.]] | [[Category: Gowen, B.]] | ||
[[Category: Horwich, A | [[Category: Horwich, A L.]] | ||
[[Category: Ranson, N | [[Category: Ranson, N A.]] | ||
[[Category: Roseman, A | [[Category: Roseman, A M.]] | ||
[[Category: Saibil, H | [[Category: Saibil, H R.]] | ||
[[Category: adp]] | [[Category: adp]] | ||
[[Category: atp]] | [[Category: atp]] | ||
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[[Category: molecular chaperone]] | [[Category: molecular chaperone]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:53:18 2008'' | ||
Revision as of 13:53, 21 February 2008
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SOLUTION STRUCTURE OF GROES-ADP7-GROEL-ATP7 COMPLEX BY CRYO-EM
OverviewOverview
The chaperonin GroEL drives its protein-folding cycle by cooperatively binding ATP to one of its two rings, priming that ring to become folding-active upon GroES binding, while simultaneously discharging the previous folding chamber from the opposite ring. The GroEL-ATP structure, determined by cryo-EM and atomic structure fitting, shows that the intermediate domains rotate downward, switching their intersubunit salt bridge contacts from substrate binding to ATP binding domains. These observations, together with the effects of ATP binding to a GroEL-GroES-ADP complex, suggest structural models for the ATP-induced reduction in affinity for polypeptide and for cooperativity. The model for cooperativity, based on switching of intersubunit salt bridge interactions around the GroEL ring, may provide general insight into cooperativity in other ring complexes and molecular machines.
About this StructureAbout this Structure
1GRU is a Protein complex structure of sequences from Escherichia coli. Full crystallographic information is available from OCA.
ReferenceReference
ATP-bound states of GroEL captured by cryo-electron microscopy., Ranson NA, Farr GW, Roseman AM, Gowen B, Fenton WA, Horwich AL, Saibil HR, Cell. 2001 Dec 28;107(7):869-79. PMID:11779463
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