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| {{STRUCTURE_2g3d| PDB=2g3d | SCENE= }} | | {{STRUCTURE_2g3d| PDB=2g3d | SCENE= }} |
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| '''Structure of S65G Y66A GFP variant after spontaneous peptide hydrolysis'''
| | ===Structure of S65G Y66A GFP variant after spontaneous peptide hydrolysis=== |
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| ==Overview==
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| The green fluorescent protein (GFP) creates a fluorophore out of three sequential amino acids by promoting spontaneous posttranslational modifications. Here, we use high-resolution crystallography to characterize GFP variants that not only undergo peptide backbone cyclization but additional denaturation-induced peptide backbone fragmentation, native peptide hydrolysis, and decarboxylation reactions. Our analyses indicate that architectural features that favor GFP peptide cyclization also drive peptide hydrolysis. These results are relevant for the maturation pathways of GFP homologues, such as the kindling fluorescent protein and the Kaede protein, which use backbone cleavage to red-shift the spectral properties of their chromophores. We further propose a photochemical mechanism for the decarboxylation reaction, supporting a role for the GFP protein environment in facilitating radical formation and one-electron chemistry, which may be important in activating oxygen for the oxidation step of chromophore biosynthesis. Together, our results characterize GFP posttranslational modification chemistry with implications for the energetic landscape of backbone cyclization and subsequent reactions, and for the rational design of predetermined spontaneous backbone cyclization and cleavage reactions. | | The line below this paragraph, {{ABSTRACT_PUBMED_16594705}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 16594705 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_16594705}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Peptide hydrolysis]] | | [[Category: Peptide hydrolysis]] |
| [[Category: Post-translational modification]] | | [[Category: Post-translational modification]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 04:38:35 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 14:52:34 2008'' |
