ISDA

Entry Detail

PDB ID:

1LK3

Keywords:

IMMUNE SYSTEM

Title:

ENGINEERED HUMAN INTERLEUKIN-10 MONOMER COMPLEXED TO 9D7 FAB FRAGMENT

Biological Source:

Source Organism:

Homo sapiens, Rattus norvegicus

Host Organism:

Escherichia coli BL21

PDB Version:

Deposition Date:

2002-04-23

Release Date:

2002-07-17

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.91 Å

R-Value Free:

0.24

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

P 1 21 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Interleukin-10
Chain IDs:A, D (auth: B)
Chain Length:160
Number of Molecules:2
Biological Source:Homo sapiens

UniProt ID:P22301 Pfam ID:PF00726

Protein Blast

Polymer Type:polypeptide(L)
Description:9D7 Heavy Chain
Chain IDs:C (auth: H), F (auth: I)
Chain Length:219
Number of Molecules:2
Biological Source:Rattus norvegicus

UniProt ID:P20759 Pfam ID:PF07654

Protein Blast

Polymer Type:polypeptide(L)
Description:9D7 Light Chain
Chain IDs:B (auth: L), E (auth: M)
Chain Length:210
Number of Molecules:2
Biological Source:Rattus norvegicus

UniProt ID:P01835 Pfam ID:PF07654

Primary Citation

Noncompetitive antibody neutralization of IL-10 revealed by protein engineering and x-ray crystallography.

Josephson, K, Jones, B.C, Walter, L.J, DiGiacomo, R, Indelicato, S.R, Walter, M.R, Josephson, K, DiGiacomo, R, Indelicato, S.R, Iyo, A.H, Nagabhushan, T.L, Parker, M.H, Walter, M.R, Ayo, A.H.Show

Structure 10 981 987 (2002)

PMID: 12121653 DOI: 10.1016/S0969-2126(02)00791-8

Abstact

IL-10 is a dimeric cytokine that must engage its high-affinity cell surface receptor, IL-10R1, to induce multiple cellular activities. Here we report the 1.9 A crystal structure of an engineered IL-10 monomer (IL-10M1) in complex with a neutralizing Fab fragment (9D7Fab). 9D7Fab and IL-10R1 bind distinct nonoverlapping surfaces on IL-10M1. Antagonism of the IL-10M1/IL-10R1 interaction is the result of 9D7Fab-induced conformational changes in the CD loop of IL-10M1 that indirectly alter the structure of the IL-10R1 binding site. A single mutation (Ile87Ala) in the same CD loop region of the Epstein-Barr virus IL-10 (ebvIL-10) also reduces IL-10R1 binding affinity, suggesting that ebvIL-10 and 9D7Fab use similar allosteric mechanisms to modulate IL-10R1 affinity and biological activity.

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