1cis: Difference between revisions
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
[[Image:1cis.jpg|left|200px]] | [[Image:1cis.jpg|left|200px]] | ||
<!-- | |||
The line below this paragraph, containing "STRUCTURE_1cis", creates the "Structure Box" on the page. | |||
You may change the PDB parameter (which sets the PDB file loaded into the applet) | |||
or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |||
| | or leave the SCENE parameter empty for the default display. | ||
| | --> | ||
{{STRUCTURE_1cis| PDB=1cis | SCENE= }} | |||
}} | |||
'''CONTEXT DEPENDENCE OF PROTEIN SECONDARY STRUCTURE FORMATION. THE THREE-DIMENSIONAL STRUCTURE AND STABILITY OF A HYBRID BETWEEN CHYMOTRYPSIN INHIBITOR 2 AND HELIX E FROM SUBTILISIN CARLSBERG''' | '''CONTEXT DEPENDENCE OF PROTEIN SECONDARY STRUCTURE FORMATION. THE THREE-DIMENSIONAL STRUCTURE AND STABILITY OF A HYBRID BETWEEN CHYMOTRYPSIN INHIBITOR 2 AND HELIX E FROM SUBTILISIN CARLSBERG''' | ||
| Line 19: | Line 16: | ||
==About this Structure== | ==About this Structure== | ||
1CIS is a [[Single protein]] structure | 1CIS is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CIS OCA]. | ||
==Reference== | ==Reference== | ||
| Line 27: | Line 24: | ||
[[Category: Poulsen, F M.]] | [[Category: Poulsen, F M.]] | ||
[[Category: Sorensen, P.]] | [[Category: Sorensen, P.]] | ||
[[Category: | [[Category: Hybrid protein]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 12:46:37 2008'' | |||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | |||
Revision as of 12:46, 2 May 2008
CONTEXT DEPENDENCE OF PROTEIN SECONDARY STRUCTURE FORMATION. THE THREE-DIMENSIONAL STRUCTURE AND STABILITY OF A HYBRID BETWEEN CHYMOTRYPSIN INHIBITOR 2 AND HELIX E FROM SUBTILISIN CARLSBERG
OverviewOverview
The loop region of chymotrypsin inhibitor 2 from barley has been employed as a scaffold for testing the intrinsic propensity of a peptide fragment to form a secondary structure. The helix formation of the nine amino acid residue segment Lys-Gln-Ala-Val-Asp-Asn-Ala-Tyr-Ala of helix E from subtilisin Carlsberg has been studied by the construction of a hybrid consisting of chymotrypsin inhibitor 2 (CI2) where part of the active loop has been replaced by the nonapeptide. An expression system for a truncated form of CI2 where the 19 structureless residues of the N-terminus have been removed and Leu20 replaced by methionyl was constructed from the entire 83-residue wild-type CI2 gene by polymerase chain reaction methodology. The gene encoding the hybrid was constructed from the truncated inhibitor gene. The stability of the truncated inhibitor and of the hybrid toward guanidinium chloride denaturation was examined. From these measurements, the energy of unfolding in pure water was extrapolated to 30.5 +/- 1.0 kJ/mol for the truncated inhibitor and 10.9 +/- 0.3 kJ/mol for the hybrid. These energies show that the stability of CI2 is unaffected by the N-terminal truncation but severely decreased by the loop mutations. The three-dimensional structure of the hybrid protein has been determined in solution by nuclear magnetic resonance spectroscopy using 893 distance restraints and 84 torsional angle restraints. The average root-mean-square deviation (rmsd) of 15 structures compared to their geometrical average was 0.8 +/- 0.2 A for heavy backbone atoms and 1.3 +/- 0.2 A for all heavy atoms.(ABSTRACT TRUNCATED AT 250 WORDS)
About this StructureAbout this Structure
1CIS is a Single protein structure. Full crystallographic information is available from OCA.
ReferenceReference
Context dependence of protein secondary structure formation: the three-dimensional structure and stability of a hybrid between chymotrypsin inhibitor 2 and helix E from subtilisin Carlsberg., Osmark P, Sorensen P, Poulsen FM, Biochemistry. 1993 Oct 19;32(41):11007-14. PMID:8218165 Page seeded by OCA on Fri May 2 12:46:37 2008