ISDA

Deposition Date 2012-12-12

Release Date 2013-02-13

Last Version Date 2024-10-09

Entry Detail

PDB ID:

4IDL

Keywords:

IMMUNE SYSTEM

Title:

Low melting temperature Anti-Cholera Toxin Llama VHH domain

Biological Source:

Source Organism:

Lama glama (Taxon ID: 9844)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.09 Å

R-Value Free:

0.22

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

C 1 2 1

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Macromolecular Entities

Polymer Type:polypeptide(L)
Molecule:Single Domain Antibody VHH A9
Chain IDs:A
Chain Length:136
Number of Molecules:1
Biological Source:Lama glama

Primary Citation

Structure of a low-melting-temperature anti-cholera toxin: llama V(H)H domain.

Legler, P.M, Zabetakis, D, Anderson, G.P, Lam, A, Hol, W.G, Goldman, E.R.Show

Acta Crystallogr.,Sect.F 69 90 93 (2013)

PMID: 23385744 DOI: 10.1107/S1744309112050750

Abstact

Variable heavy domains derived from the heavy-chain-only antibodies found in camelids (V(H)H domains) are known for their thermal stability. Here, the structure of A9, an anti-cholera toxin V(H)H domain (K(d) = 77 ± 5 nM) that has an unusually low melting temperature of 319.9 ± 1.6 K, is reported. The CDR3 residues of A9 form a β-hairpin that is directed away from the former V(H)-V(L) interfacial surface, exposing hydrophobic residues to the solvent. A DALI structural similarity search showed that this CDR3 conformation is uncommon.

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