1JQU

Are Carboxy Terminii of Helices Coded by the Local Sequence or by Tertiary Structure Contacts

Summary for 1JQU

• Entry DOI: 10.2210/pdb1jqu/pdb
• Related: 1joz
• Descriptor: Lysozyme (2 entities in total)
• Functional Keywords: glycine helix terminii, schellman motif, alpha-l motif, hydrolase
• Biological source: Enterobacteria phage T4
• Total number of polymer chains: 4
• Total formula weight: 74221.25

Authors

Sagermann, M.,Martensson, L.-G.,Baase, W.A.,Matthews, B.W. (deposition date: 2001-08-08, release date: 2002-03-06, Last modification date: 2023-08-16)

Primary citation

Sagermann, M.,Martensson, L.-G.,Baase, W.A.,Matthews, B.W.
A test of proposed rules for helix capping: Implications for protein design
Protein Sci., 11:516-521, 2002

PubMed Abstract: 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.

PubMed: 11847274
DOI: 10.1110/ps.39802

Experimental method

X-RAY DIFFRACTION (2.6 Å)