1a2t
From Proteopedia
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|PDB= 1a2t |SIZE=350|CAPTION= <scene name='initialview01'>1a2t</scene>, resolution 1.96Å | |PDB= 1a2t |SIZE=350|CAPTION= <scene name='initialview01'>1a2t</scene>, resolution 1.96Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene> and <scene name='pdbligand=THP:THYMIDINE-3 | + | |LIGAND= <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene> and <scene name='pdbligand=THP:THYMIDINE-3',5'-DIPHOSPHATE'>THP</scene> |
|ACTIVITY= [http://en.wikipedia.org/wiki/Micrococcal_nuclease Micrococcal nuclease], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.31.1 3.1.31.1] | |ACTIVITY= [http://en.wikipedia.org/wiki/Micrococcal_nuclease Micrococcal nuclease], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.31.1 3.1.31.1] | ||
|GENE= | |GENE= | ||
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[[Category: unnatural amino acid]] | [[Category: unnatural amino acid]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 23 11:03:49 2008'' |
Revision as of 09:03, 23 March 2008
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| , resolution 1.96Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | and | ||||||
| Activity: | Micrococcal nuclease, with EC number 3.1.31.1 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
STAPHYLOCOCCAL NUCLEASE, B-MERCAPTOETHANOL DISULFIDE TO V23C VARIANT
Overview
The structures of several variants of staphylococcal nuclease with long flexible unnatural amino acid side chains in the hydrophobic core have been determined by X-ray crystallography. The unnatural amino acids are disulfide moieties between the lone cysteine residue in V23C nuclease and methane, ethane, 1-n-propane, 1-n-butane, 1-n-pentane, and 2-hydroxyethyl thiols. We have examined changes in the core packing of these mutants. Side chains as large as the 1-n-propyl cysteine disulfide can be incorporated without perturbation of the structure. This is due, in part, to cavities present in the wild-type protein. The longest side chains are not well defined, even though they remain buried within the protein interior. These results suggest that the enthalpy-entropy balance that governs the rigidity of protein interiors favors tight packing only weakly. Additionally, the tight packing observed normally in protein interiors may reflect, in part, the limited numbers of rotamers available to the natural amino acids.
About this Structure
1A2T is a Single protein structure of sequence from Staphylococcus aureus. Full crystallographic information is available from OCA.
Reference
Mobile unnatural amino acid side chains in the core of staphylococcal nuclease., Wynn R, Harkins PC, Richards FM, Fox RO, Protein Sci. 1996 Jun;5(6):1026-31. PMID:8762134
Page seeded by OCA on Sun Mar 23 11:03:49 2008
