1jug
From Proteopedia
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| - | [[Image:1jug. | + | [[Image:1jug.jpg|left|200px]]<br /><applet load="1jug" size="450" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="1jug" size="450" color="white" frame="true" align="right" spinBox="true" | + | |
caption="1jug, resolution 1.9Å" /> | caption="1jug, resolution 1.9Å" /> | ||
'''LYSOZYME FROM ECHIDNA MILK (TACHYGLOSSUS ACULEATUS)'''<br /> | '''LYSOZYME FROM ECHIDNA MILK (TACHYGLOSSUS ACULEATUS)'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1JUG is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Tachyglossus_aculeatus Tachyglossus aculeatus] with CA as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Lysozyme Lysozyme], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.17 3.2.1.17] | + | 1JUG is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Tachyglossus_aculeatus Tachyglossus aculeatus] with CA as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Lysozyme Lysozyme], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.17 3.2.1.17] Known structural/functional Site: <scene name='pdbsite=CAB:Ca Binding Site'>CAB</scene>. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1JUG OCA]. |
==Reference== | ==Reference== | ||
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[[Category: lysozyme]] | [[Category: lysozyme]] | ||
| - | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Dec 18 16:38:51 2007'' |
Revision as of 14:29, 18 December 2007
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LYSOZYME FROM ECHIDNA MILK (TACHYGLOSSUS ACULEATUS)
Overview
A lysozyme isolated from the milk of a monotreme, the echidna, Tachyglossus aculeatus multiaculeatus, has been crystallized (space group, P2(1), with unit-cell dimensions a = 37.1, b = 42.0, c = 38.1 A, beta = 91, degrees and Z = 2) and the structure refined to an R value of 0.167 for, all measured data in the resolution range 7.0-1.9 A. It had previously, been inferred from sequence homology with alpha-lactalbumins that echidna, milk lysozyme (EML) would bind one calcium ion per molecule. This has been, confirmed in the present study in which the largest peak in a difference, Fourier synthesis is associated with a calcium ion. The calcium binding, site of EML is very similar to that observed in baboon and human, alpha-lactalbumins, and in a human lysozyme engineered to contain a, calcium-binding site. The overall fold of the protein is similar to that, of chick-type lysozymes. EML, like pigeon lysozyme, has only 125 residues, terminating at a cysteine but in EML this forms a disulfide with a, cysteine at residue 9 whereas the equivalent cysteine residue in all other, lysozymes of known sequence occurs at position 6. These changes cause some, minor structural rearrangements. The binding of calcium appears to have, had little effect on the polypeptide backbone conformation and caused only, small changes in the conformation of side chains coordinating the calcium, ion. A homology modelling study [Acharya, Stuart, Phillips, McKenzie &, Teahan (1994). J. Protein Chem. 13(6), 569-584] correctly predicted the, overall structure of EML and the nature of its calcium binding site but, generally failed to model some more subtle differences observed in the EML, structure as evidenced by the fact that the homology model more closely, resembles the starting structure from which the model was derived than it, does the crystal structure.
About this Structure
1JUG is a Single protein structure of sequence from Tachyglossus aculeatus with CA as ligand. Active as Lysozyme, with EC number 3.2.1.17 Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Structure of the calcium-binding echidna milk lysozyme at 1.9 A resolution., Guss JM, Messer M, Costello M, Hardy K, Kumar V, Acta Crystallogr D Biol Crystallogr. 1997 Jul 1;53(Pt 4):355-63. PMID:15299900
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