ISDA

Deposition Date 2002-08-22

Release Date 2003-09-02

Last Version Date 2024-02-14

Entry Detail

PDB ID:

1MI7

Keywords:

TRANSCRIPTION

Title:

Crystal Structure of Domain Swapped trp Aporepressor in 30%(v/v) Isopropanol

Biological Source:

Source Organism:

Escherichia coli (Taxon ID: 562)

Host Organism:

Escherichia coli BL21(DE3)

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.50 Å

R-Value Free:

0.28

R-Value Work:

0.25

R-Value Observed:

0.25

Space Group:

P 61 2 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Trp operon repressor
Gene (Uniprot):trpR
Chain IDs:A (auth: R)
Chain Length:107
Number of Molecules:1
Biological Source:Escherichia coli

UniProt ID:P0A881 Pfam ID:PF01371

Ligand Molecules

IPA

Primary Citation

E. coli trp repressor forms a domain-swapped array in aqueous alcohol.

Lawson, C.L, Benoff, B, Berger, T, Berman, H.M, Carey, J.Show

Structure 12 1099 1108 (2004)

PMID: 15274929 DOI: 10.1016/j.str.2004.03.019

Abstact

The E. coli trp repressor (trpR) homodimer recognizes its palindromic DNA binding site through a pair of flexible helix-turn-helix (HTH) motifs displayed on an intertwined helical core. Flexible N-terminal arms mediate association between dimers bound to tandem DNA sites. The 2.5 A X-ray structure of trpR crystallized in 30% (v/v) isopropanol reveals a substantial conformational rearrangement of HTH motifs and N-terminal arms, with the protein appearing in the unusual form of an ordered 3D domain-swapped supramolecular array. Small angle X-ray scattering measurements show that the self-association properties of trpR in solution are fundamentally altered by isopropanol.

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Primary Citation of related structures