Abstract
Protein-based self-assembled nanostructures hold tremendous promise as smart materials. One strategy to control the assembly of individual protein modules takes advantage of the directionality and high affinity bonding afforded by metal chelation. Here, we describe the use of 2,2′-bipyridine units (Bpy) as side chains to template the assembly of large structures (MW approx. 35 000 Da) in a metal-dependent manner. The structures are trimers of independently folded 3-helix bundles, and are held together by 2 Me(Bpy)3 complexes. The assemblies are stable to thermal denaturation, and are more than 90% helical at 90°C. Circular dichroism spectroscopy shows that one of the 2 possible (Bpy)3 enantiomers is favored over the other. Because of the sequence pliability of the starting peptides, these constructs could find use to organize functional groups at controlled positions within a supramolecular assembly.
| Original language | English |
|---|---|
| Article number | e23233 |
| Journal | Biopolymers |
| Volume | 109 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - Aug 1 2018 |
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Keywords
- metal binding
- protein assembly
- protein design
ASJC Scopus subject areas
- Biophysics
- Biochemistry
- Biomaterials
- Organic Chemistry
Cite this
Rational design of a hexameric protein assembly stabilized by metal chelation. / Alcala-Torano, Rafael; Walther, Mathieu; Sommer, Dayn J.; Park, Chad K.; Ghirlanda, Giovanna.
In: Biopolymers, Vol. 109, No. 10, e23233, 01.08.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Rational design of a hexameric protein assembly stabilized by metal chelation
AU - Alcala-Torano, Rafael
AU - Walther, Mathieu
AU - Sommer, Dayn J.
AU - Park, Chad K.
AU - Ghirlanda, Giovanna
PY - 2018/8/1
Y1 - 2018/8/1
N2 - Protein-based self-assembled nanostructures hold tremendous promise as smart materials. One strategy to control the assembly of individual protein modules takes advantage of the directionality and high affinity bonding afforded by metal chelation. Here, we describe the use of 2,2′-bipyridine units (Bpy) as side chains to template the assembly of large structures (MW approx. 35 000 Da) in a metal-dependent manner. The structures are trimers of independently folded 3-helix bundles, and are held together by 2 Me(Bpy)3 complexes. The assemblies are stable to thermal denaturation, and are more than 90% helical at 90°C. Circular dichroism spectroscopy shows that one of the 2 possible (Bpy)3 enantiomers is favored over the other. Because of the sequence pliability of the starting peptides, these constructs could find use to organize functional groups at controlled positions within a supramolecular assembly.
AB - Protein-based self-assembled nanostructures hold tremendous promise as smart materials. One strategy to control the assembly of individual protein modules takes advantage of the directionality and high affinity bonding afforded by metal chelation. Here, we describe the use of 2,2′-bipyridine units (Bpy) as side chains to template the assembly of large structures (MW approx. 35 000 Da) in a metal-dependent manner. The structures are trimers of independently folded 3-helix bundles, and are held together by 2 Me(Bpy)3 complexes. The assemblies are stable to thermal denaturation, and are more than 90% helical at 90°C. Circular dichroism spectroscopy shows that one of the 2 possible (Bpy)3 enantiomers is favored over the other. Because of the sequence pliability of the starting peptides, these constructs could find use to organize functional groups at controlled positions within a supramolecular assembly.
KW - metal binding
KW - protein assembly
KW - protein design
UR - http://www.scopus.com/inward/record.url?scp=85052965300&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85052965300&partnerID=8YFLogxK
U2 - 10.1002/bip.23233
DO - 10.1002/bip.23233
M3 - Article
C2 - 30191549
AN - SCOPUS:85052965300
VL - 109
JO - Biopolymers
JF - Biopolymers
SN - 0006-3525
IS - 10
M1 - e23233
ER -