1eb4
From Proteopedia
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==Overview== | ==Overview== | ||
| - | Histidine ammonia-lyase requires a 4-methylidene-imidazole-5-one group | + | Histidine ammonia-lyase requires a 4-methylidene-imidazole-5-one group (MIO) that is produced autocatalytically by a cyclization and dehydration step in a 3-residue loop of the polypeptide. The crystal structures of three mutants have been established. Two mutants were inactive and failed to form MIO, but remained unchanged elsewhere. The third mutant showed very low activity and formed MIO, although it differed from an MIO-less mutant only by an additional 329-C(beta) atom. This atom forms one constraint during MIO formation, the other being the strongly connected Asp145. An exploration of the conformational space of the MIO-forming loop showed that the cyclization is probably enforced by a mechanic compression in a late stage of chain folding and is catalyzed by a well-connected internal water molecule. The cyclization of the respective 3-residue loop of green fluorescent protein is likely to occur in a similar reaction. |
==About this Structure== | ==About this Structure== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Baedeker, M.]] | [[Category: Baedeker, M.]] | ||
| - | [[Category: Schulz, G | + | [[Category: Schulz, G E.]] |
[[Category: GOL]] | [[Category: GOL]] | ||
[[Category: SO4]] | [[Category: SO4]] | ||
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[[Category: lyase]] | [[Category: lyase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:25:53 2008'' |
Revision as of 10:25, 21 February 2008
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HISTIDINE AMMONIA-LYASE (HAL) MUTANT F329A FROM PSEUDOMONAS PUTIDA
Overview
Histidine ammonia-lyase requires a 4-methylidene-imidazole-5-one group (MIO) that is produced autocatalytically by a cyclization and dehydration step in a 3-residue loop of the polypeptide. The crystal structures of three mutants have been established. Two mutants were inactive and failed to form MIO, but remained unchanged elsewhere. The third mutant showed very low activity and formed MIO, although it differed from an MIO-less mutant only by an additional 329-C(beta) atom. This atom forms one constraint during MIO formation, the other being the strongly connected Asp145. An exploration of the conformational space of the MIO-forming loop showed that the cyclization is probably enforced by a mechanic compression in a late stage of chain folding and is catalyzed by a well-connected internal water molecule. The cyclization of the respective 3-residue loop of green fluorescent protein is likely to occur in a similar reaction.
About this Structure
1EB4 is a Single protein structure of sequence from Pseudomonas putida with and as ligands. Active as Histidine ammonia-lyase, with EC number 4.3.1.3 Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Autocatalytic peptide cyclization during chain folding of histidine ammonia-lyase., Baedeker M, Schulz GE, Structure. 2002 Jan;10(1):61-7. PMID:11796111
Page seeded by OCA on Thu Feb 21 12:25:53 2008
