1cu2: Difference between revisions

Revision as of 13:06, 2 May 2008

T4 LYSOZYME MUTANT L84M

OverviewOverview

In an attempt to identify a systematic relation between the structure of a protein and its folding kinetics, the rate of folding was determined for 20 mutants of T4 lysozyme in which a bulky, buried, nonpolar wild-type residue (Leu, Ile, Phe, Val, or Met) was substituted with alanine. Methionine, which approximated the size of the original side chain but which is of different shape and flexibility, was also substituted at most of the same sites. Mutations that substantially destabilize the protein and are located in the carboxy-terminal domain generally slow the rate of folding. Destabilizing mutations in the amino-terminal domain, however, have little effect on the rate of folding. Mutations that have little effect on stability tend to have little effect on the rate, no matter where they are located. These results suggest that, at the rate-limiting step, elements of structure in the C-terminal domain are formed and have a structure similar to that of the fully folded protein. Consistent with this, two variants that somewhat increase the rate of folding (Phe104 --> Met and Val149 --> Met) are located within the carboxy-terminal domain and maintain or improve packing with very little perturbation of the wild-type structure.

About this StructureAbout this Structure

1CU2 is a Single protein structure of sequence from Enterobacteria phage t4. Full crystallographic information is available from OCA.

ReferenceReference

Methionine and alanine substitutions show that the formation of wild-type-like structure in the carboxy-terminal domain of T4 lysozyme is a rate-limiting step in folding., Gassner NC, Baase WA, Lindstrom JD, Lu J, Dahlquist FW, Matthews BW, Biochemistry. 1999 Nov 2;38(44):14451-60. PMID:10545167 Page seeded by OCA on Fri May 2 13:06:45 2008

Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA

@@ Line 1: / Line 1: @@
 [[Image:1cu2.gif|left|200px]]
- {{Structure
+<!--
-|PDB= 1cu2 |SIZE=350|CAPTION= <scene name='initialview01'>1cu2</scene>, resolution 1.85&Aring;
+The line below this paragraph, containing "STRUCTURE_1cu2", creates the "Structure Box" on the page.
-|SITE=
+You may change the PDB parameter (which sets the PDB file loaded into the applet)
-|LIGAND= <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=HED:2-HYDROXYETHYL+DISULFIDE'>HED</scene>
+or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
-|ACTIVITY= <span class='plainlinks'>[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] </span>
+or leave the SCENE parameter empty for the default display.
-|GENE=
+-->
-|DOMAIN=
+{{STRUCTURE_1cu2|  PDB=1cu2  |  SCENE=  }}
-|RELATEDENTRY=[[1ctw|1CTW]], [[1cu0|1CU0]], [[1cu3|1CU3]], [[1cu6|1CU6]], [[1cu5|1CU5]], [[1cup|1CUP]], [[1cuq|1CUQ]], [[1cv0|1CV0]], [[1cv1|1CV1]], [[1qsq|1QSQ]], [[1cv4|1CV4]], [[1cv3|1CV3]], [[1cv5|1CV5]], [[1cv6|1CV6]], [[1cvk|1CVK]], [[1d2w|1D2W]], [[1d2y|1D2Y]], [[1d3f|1D3F]], [[1d3j|1D3J]]
-|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1cu2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cu2 OCA], [http://www.ebi.ac.uk/pdbsum/1cu2 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1cu2 RCSB]</span>
-}}
 '''T4 LYSOZYME MUTANT L84M'''
@@ Line 31: / Line 28: @@
 [[Category: Lu, J.]]
 [[Category: Matthews, B W.]]
-[[Category: hydrolase (o-glycosyl)]]
+[[Category: Methionine core mutant]]
-[[Category: methionine core mutant]]
+[[Category: Protein engineering]]
-[[Category: protein engineering]]
+[[Category: Protein folding]]
-[[Category: protein folding]]
+[[Category: T4 lysozyme]]
-[[Category: t4 lysozyme]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 13:06:45 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 19:28:35 2008''