1GXQ

Crystal structure of the PhoB effector domain

Summary for 1GXQ

• Entry DOI: 10.2210/pdb1gxq/pdb
• Related: 1B00 1GXP 1QQI
• Descriptor: PHOSPHATE REGULON TRANSCRIPTIONAL REGULATORY PROTEIN PHOB (2 entities in total)
• Functional Keywords: transcriptional activator, helix-winged-helix, sensory transduction, phosphorylation, dna binding, activator, two-component signal transduction
• Biological source: ESCHERICHIA COLI
• Cellular location: Cytoplasm: P0AFJ5
• Total number of polymer chains: 1
• Total formula weight: 12358.09

Authors

Blanco, A.G.,Sola, M.,Gomis-Ruth, F.X.,Coll, M. (deposition date: 2002-04-08, release date: 2002-04-29, Last modification date: 2023-12-13)

Primary citation

Blanco, A.G.,Sola, M.,Gomis-Ruth, F.X.,Coll, M.
Tandem DNA Recognition by Two-Component Signal Transduction Transcriptional Activator Phob
Structure, 10:701-, 2002

PubMed Abstract: PhoB is a signal transduction response regulator that activates nearly 40 genes in phosphate depletion conditions in E. coli and closely related bacteria. The structure of the PhoB effector domain in complex with its target DNA sequence, or pho box, reveals a novel tandem arrangement in which several monomers bind head to tail to successive 11-base pair direct-repeat sequences, coating one face of a smoothly bent double helix. The protein has a winged helix fold in which the DNA recognition elements comprise helix alpha 3, penetrating the major groove, and a beta hairpin wing interacting with a compressed minor groove via Arg219, tightly sandwiched between the DNA sugar backbones. The transactivation loops protrude laterally in an appropriate orientation to interact with the RNA polymerase sigma(70) subunit, which triggers transcription initiation.

PubMed: 12015152
DOI: 10.1016/S0969-2126(02)00761-X

Experimental method

X-RAY DIFFRACTION (2 Å)