9mfb

From Proteopedia

(Difference between revisions)

Current revision

Backbone alpha-Methylation in the Villin Headpiece Miniprotein: HP35 with Calpha-methyl-Lys at Position 30

Structural highlights

9mfb is a 1 chain structure with sequence from Gallus gallus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Solution NMR, 10 models
Ligands:	, ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

VILI_CHICK Epithelial cell-specific Ca(2+)-regulated actin-modifying protein that modulates the reorganization of microvillar actin filaments. Plays a role in the actin nucleation, actin filament bundle assembly, actin filament capping and severing. Binds phosphatidylinositol 4,5-bisphosphate (PIP2) and lysophosphatidic acid (LPA); binds LPA with higher affinity than PIP2. Binding to LPA increases its phosphorylation by SRC and inhibits all actin-modifying activities. Binding to PIP2 inhibits actin-capping and -severing activities but enhances actin-bundling activity. Regulates the intestinal epithelial cell morphology, cell invasion, cell migration and apoptosis. Protects against apoptosis induced by dextran sodium sulfate (DSS) in the gastrointestinal epithelium. Appears to regulate cell death by maintaining mitochondrial integrity. Enhances hepatocyte growth factor (HGF)-induced epithelial cell motility, chemotaxis and wound repair (By similarity). Its actin-bundling activity is inhibited by tropomyosin.^[1] ^[2]

Publication Abstract from PubMed

The alpha-helix is an abundant and functionally important element of protein secondary structure, which has motivated intensive efforts toward chemical strategies to stabilize helical folds. One such method is the incorporation of non-canonical backbone composition through an additional methyl substituent at the Calpha atom. Examples of monomers include the achiral 2-aminoisobutyric acid (Aib) with geminal dimethyl substitution and chiral analogues with one methyl and one non-methyl substituent. While Aib and chiral Calpha-Me residues are both established helix promoting moieties, their comparative ability in this regard has not been quantitatively investigated. Addressing this gap would help to inform the use of these building blocks in the construction of peptide and protein mimetics as well as provide fundamental insights into consequences of backbone methylation on folding. Here, we report a quantitative comparison of the impacts of Aib and chiral alphaMe residues on the high-resolution folded structure and folding thermodynamics of a small helical protein. These results reveal a synergistic stabilizing effect arising from the presence of Calpha methylation in conjunction with a Calpha stereocenter.

Interplay between Calpha Methylation and Calpha Stereochemistry in the Folding Energetics of a Helix-Rich Miniprotein.,Harmon TW, Lin Y, Sutton RT, Osborne SWJ, Horne WS Chembiochem. 2025 Jan 10:e202401022. doi: 10.1002/cbic.202401022. PMID:39791987^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Burgess DR, Broschat KO, Hayden JM. Tropomyosin distinguishes between the two actin-binding sites of villin and affects actin-binding properties of other brush border proteins. J Cell Biol. 1987 Jan;104(1):29-40. PMID:3793760
↑ de Arruda MV, Bazari H, Wallek M, Matsudaira P. An actin footprint on villin. Single site substitutions in a cluster of basic residues inhibit the actin severing but not capping activity of villin. J Biol Chem. 1992 Jun 25;267(18):13079-85. PMID:1618806
↑ Harmon TW, Lin Y, Sutton RT, Osborne SWJ, Horne WS. Interplay between Cα Methylation and Cα Stereochemistry in the Folding Energetics of a Helix-Rich Miniprotein. Chembiochem. 2025 Jan 10:e202401022. PMID:39791987 doi:10.1002/cbic.202401022

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/9mfb"

@@ Line 5: / Line 5: @@
 <table><tr><td colspan='2'>[[9mfb]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9MFB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9MFB FirstGlance]. <br>
 </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 10 models</td></tr>
-<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A1BEB:(2~{S})-2,6-bis(azanyl)-2-methyl-hexanoic+acid'>A1BEB</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene>, <scene name='pdbligand=NLE:NORLEUCINE'>NLE</scene></td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=A1BEB:2-methyl-L-lysine'>A1BEB</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</scene>, <scene name='pdbligand=NLE:NORLEUCINE'>NLE</scene></td></tr>
 <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=9mfb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9mfb OCA], [https://pdbe.org/9mfb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9mfb RCSB], [https://www.ebi.ac.uk/pdbsum/9mfb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9mfb ProSAT]</span></td></tr>
 </table>

9mfb

From Proteopedia

Current revision

Backbone alpha-Methylation in the Villin Headpiece Miniprotein: HP35 with Calpha-methyl-Lys at Position 30

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

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