1kls
From Proteopedia
(New page: 200px<br /> <applet load="1kls" size="450" color="white" frame="true" align="right" spinBox="true" caption="1kls" /> '''NMR Structure of the ZFY-6T[Y10L] Zinc Fing...) |
|||
| Line 1: | Line 1: | ||
| - | [[Image:1kls. | + | [[Image:1kls.jpg|left|200px]]<br /><applet load="1kls" size="350" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="1kls" size=" | + | |
caption="1kls" /> | caption="1kls" /> | ||
'''NMR Structure of the ZFY-6T[Y10L] Zinc Finger'''<br /> | '''NMR Structure of the ZFY-6T[Y10L] Zinc Finger'''<br /> | ||
| Line 11: | Line 10: | ||
==About this Structure== | ==About this Structure== | ||
| - | 1KLS is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/ ] with ZN as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http:// | + | 1KLS is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/ ] with <scene name='pdbligand=ZN:'>ZN</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KLS OCA]. |
==Reference== | ==Reference== | ||
| Line 25: | Line 24: | ||
[[Category: zinc finger]] | [[Category: zinc finger]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri Feb 15 16:14:39 2008'' |
Revision as of 14:14, 15 February 2008
|
NMR Structure of the ZFY-6T[Y10L] Zinc Finger
Contents |
Overview
The Zn finger provides a model for studies of protein structure and, stability. Its core contains a conserved phenylalanine residue adjoining, three architectural elements: a beta-hairpin, an alpha-helix and a, tetrahedral Zn(2+)-binding site. Here, we demonstrate that the consensus, Phe is not required for high-affinity Zn(2+) binding but contributes to, the specification of a precise DNA-binding surface. Substitution of Phe by, leucine in a ZFY peptide permits Zn(2+)-dependent folding. Although a, native-like structure is retained, structural fluctuations lead to, attenuation of selected nuclear Overhauser enhancements and accelerated, amide proton exchange. Surprisingly, wild-type Zn affinity is maintained, by entropy-enthalpy compensation (EEC): a hidden entropy penalty, (TDeltaDeltaS 7kcal/mol) is balanced by enhanced enthalpy of association, (DeltaDeltaH -7kcal/mol) at 25 degrees C. Because the variant is less well, ordered than the Phe-anchored domain, the net change in entropy is, opposite to the apparent change in configurational entropy. By analogy to, the thermodynamics of organometallic complexation, we propose that EEC, arises from differences in solvent reorganization. Exclusion of Leu among, biological sequences suggests an evolutionary constraint on the dynamics, of a Zn finger.
Disease
Known disease associated with this structure: Spastic paraplegia 33 OMIM:[610243]
About this Structure
1KLS is a Single protein structure of sequence from [1] with as ligand. Full crystallographic information is available from OCA.
Reference
The hidden thermodynamics of a zinc finger., Lachenmann MJ, Ladbury JE, Phillips NB, Narayana N, Qian X, Weiss MA, J Mol Biol. 2002 Mar 1;316(4):969-89. PMID:11884136
Page seeded by OCA on Fri Feb 15 16:14:39 2008
