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| {{STRUCTURE_2q9a| PDB=2q9a | SCENE= }} | | {{STRUCTURE_2q9a| PDB=2q9a | SCENE= }} |
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| '''Structure of Apo FTSY'''
| | ===Structure of Apo FTSY=== |
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| ==Overview==
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| The signal recognition particle (SRP) and its conjugate receptor (SR) mediate cotranslational targeting of a subclass of proteins destined for secretion to the endoplasmic reticulum membrane in eukaryotes or to the plasma membrane in prokaryotes. Conserved active site residues in the GTPase domains of both SRP and SR mediate discrete conformational changes during formation and dissociation of the SRP.SR complex. Here, we describe structures of the prokaryotic SR, FtsY, as an apo protein and in two different complexes with a non-hydrolysable GTP analog (GMPPNP). These structures reveal intermediate conformations of FtsY containing GMPPNP and explain how the conserved active site residues position the nucleotide into a non-catalytic conformation. The basis for the lower specificity of binding of nucleotide in FtsY prior to heterodimerization with the SRP conjugate Ffh is also shown. We propose that these structural changes represent discrete conformational states assumed by FtsY during targeting complex formation and dissociation. | | The line below this paragraph, {{ABSTRACT_PUBMED_17622352}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 17622352 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_17622352}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Signal recognition particle]] | | [[Category: Signal recognition particle]] |
| [[Category: Srp]] | | [[Category: Srp]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 14:34:06 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 15:09:32 2008'' |