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3aat
From Proteopedia
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| - | [[Image:3aat.gif|left|200px]] | + | [[Image:3aat.gif|left|200px]] |
| - | + | ||
| - | '''ACTIVITY AND STRUCTURE OF THE ACTIVE-SITE MUTANTS R386Y AND R386F OF ESCHERICHIA COLI ASPARTATE AMINOTRANSFERASE''' | + | {{Structure |
| + | |PDB= 3aat |SIZE=350|CAPTION= <scene name='initialview01'>3aat</scene>, resolution 2.8Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene> and <scene name='pdbligand=PLP:PYRIDOXAL-5'-PHOSPHATE'>PLP</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Aspartate_transaminase Aspartate transaminase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.6.1.1 2.6.1.1] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''ACTIVITY AND STRUCTURE OF THE ACTIVE-SITE MUTANTS R386Y AND R386F OF ESCHERICHIA COLI ASPARTATE AMINOTRANSFERASE''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 3AAT is a [ | + | 3AAT is a [[Single protein]] structure of sequence 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=3AAT OCA]. |
==Reference== | ==Reference== | ||
| - | Activity and structure of the active-site mutants R386Y and R386F of Escherichia coli aspartate aminotransferase., Danishefsky AT, Onnufer JJ, Petsko GA, Ringe D, Biochemistry. 1991 Feb 19;30(7):1980-5. PMID:[http:// | + | Activity and structure of the active-site mutants R386Y and R386F of Escherichia coli aspartate aminotransferase., Danishefsky AT, Onnufer JJ, Petsko GA, Ringe D, Biochemistry. 1991 Feb 19;30(7):1980-5. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/1993208 1993208] |
[[Category: Aspartate transaminase]] | [[Category: Aspartate transaminase]] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
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[[Category: transferase(aminotransferase)]] | [[Category: transferase(aminotransferase)]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 18:55:25 2008'' |
Revision as of 16:55, 20 March 2008
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| , resolution 2.8Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | and | ||||||
| Activity: | Aspartate transaminase, with EC number 2.6.1.1 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
ACTIVITY AND STRUCTURE OF THE ACTIVE-SITE MUTANTS R386Y AND R386F OF ESCHERICHIA COLI ASPARTATE AMINOTRANSFERASE
Overview
Arginine-386, the active-site residue of Escherichia coli aspartate aminotransferase (EC 2.6.1.1) that binds the substrate alpha-carboxylate, was replaced with tyrosine and phenylalanine by site-directed mutagenesis. This experiment was undertaken to elucidate the roles of particular enzyme-substrate interactions in triggering the substrate-induced conformational change in the enzyme. The activity and crystal structure of the resulting mutants were examined. The apparent second-order rate constants of both of these mutants are reduced by more than 5 orders of magnitude as compared to that of wild-type enzyme, though R386Y is slightly more active than R386F. The 2.5-A resolution structure of R386F in its native state was determined by using difference Fourier methods. The overall structure is very similar to that of the wild-type enzyme in the open conformation. The position of the Phe-386 side chain, however, appears to shift with respect to that of Arg-386 in the wild-type enzyme and to form new contacts with neighboring residues.
About this Structure
3AAT is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Activity and structure of the active-site mutants R386Y and R386F of Escherichia coli aspartate aminotransferase., Danishefsky AT, Onnufer JJ, Petsko GA, Ringe D, Biochemistry. 1991 Feb 19;30(7):1980-5. PMID:1993208
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