1jqu
From Proteopedia
(New page: 200px<br /><applet load="1jqu" size="450" color="white" frame="true" align="right" spinBox="true" caption="1jqu, resolution 2.6Å" /> '''Are Carboxy Terminii ...) |
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| - | [[Image:1jqu.jpg|left|200px]]<br /><applet load="1jqu" size=" | + | [[Image:1jqu.jpg|left|200px]]<br /><applet load="1jqu" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1jqu, resolution 2.6Å" /> | caption="1jqu, resolution 2.6Å" /> | ||
'''Are Carboxy Terminii of Helices Coded by the Local Sequence or by Tertiary Structure Contacts'''<br /> | '''Are Carboxy Terminii of Helices Coded by the Local Sequence or by Tertiary Structure Contacts'''<br /> | ||
==Overview== | ==Overview== | ||
| - | alpha-helices within proteins are often terminated (capped) by distinctive | + | alpha-helices within proteins are often terminated (capped) by distinctive configurations of the polypeptide chain. Two common arrangements are the Schellman motif and the alternative alpha(L) motif. Rose and coworkers developed stereochemical rules to identify the locations of such motifs in proteins of unknown structure based only on their amino acid sequences. To check the effectiveness of these rules, they made specific predictions regarding the structural and thermodynamic consequences of certain mutations in T4 lysozyme. We have constructed these mutants and show here that they have neither the structure nor the stability that was predicted. The results show the complexity of the protein-folding problem. Comparison of known protein structures may show that a characteristic sequence of amino acids (a sequence motif) corresponds to a conserved structural motif. In any particular protein, however, changes in other parts of the sequence may result in a different conformation. The structure is determined by sequence as a whole, not by parts considered in isolation. |
==About this Structure== | ==About this Structure== | ||
| - | 1JQU is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacteriophage_t4 Bacteriophage t4]. 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] Full crystallographic information is available from [http:// | + | 1JQU is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Bacteriophage_t4 Bacteriophage t4]. 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] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JQU OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Lysozyme]] | [[Category: Lysozyme]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Baase, W | + | [[Category: Baase, W A.]] |
| - | [[Category: Martensson, L | + | [[Category: Martensson, L G.]] |
| - | [[Category: Matthews, B | + | [[Category: Matthews, B W.]] |
[[Category: Sagermann, M.]] | [[Category: Sagermann, M.]] | ||
[[Category: alpha-l motif]] | [[Category: alpha-l motif]] | ||
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[[Category: schellman motif]] | [[Category: schellman motif]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:25:43 2008'' |
Revision as of 11:25, 21 February 2008
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Are Carboxy Terminii of Helices Coded by the Local Sequence or by Tertiary Structure Contacts
Overview
alpha-helices within proteins are often terminated (capped) by distinctive configurations of the polypeptide chain. Two common arrangements are the Schellman motif and the alternative alpha(L) motif. Rose and coworkers developed stereochemical rules to identify the locations of such motifs in proteins of unknown structure based only on their amino acid sequences. To check the effectiveness of these rules, they made specific predictions regarding the structural and thermodynamic consequences of certain mutations in T4 lysozyme. We have constructed these mutants and show here that they have neither the structure nor the stability that was predicted. The results show the complexity of the protein-folding problem. Comparison of known protein structures may show that a characteristic sequence of amino acids (a sequence motif) corresponds to a conserved structural motif. In any particular protein, however, changes in other parts of the sequence may result in a different conformation. The structure is determined by sequence as a whole, not by parts considered in isolation.
About this Structure
1JQU is a Single protein structure of sequence from Bacteriophage t4. Active as Lysozyme, with EC number 3.2.1.17 Full crystallographic information is available from OCA.
Reference
A test of proposed rules for helix capping: implications for protein design., Sagermann M, Martensson LG, Baase WA, Matthews BW, Protein Sci. 2002 Mar;11(3):516-21. PMID:11847274
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