1PIQ

CRYSTAL STRUCTURE OF GCN4-PIQ, A TRIMERIC COILED COIL WITH BURIED POLAR RESIDUES

Summary for 1PIQ

• Entry DOI: 10.2210/pdb1piq/pdb
• Descriptor: PROTEIN (GENERAL CONTROL PROTEIN GCN4-PIQ), CHLORIDE ION (3 entities in total)
• Functional Keywords: ion binding, buried polar residue, dna binding protein
• Cellular location: Nucleus: P03069
• Total number of polymer chains: 1
• Total formula weight: 3836.95

Authors

Eckert, D.M.,Malashkevich, V.N.,Kim, P.S. (deposition date: 1998-09-25, release date: 1998-09-30, Last modification date: 2024-10-30)

Primary citation

Eckert, D.M.,Malashkevich, V.N.,Kim, P.S.
Crystal structure of GCN4-pIQI, a trimeric coiled coil with buried polar residues.
J.Mol.Biol., 284:859-865, 1998

PubMed Abstract: Coiled coils consist of two or more alpha-helices wrapped around each other with a superhelical twist. The interfaces between helices of a coiled coil are formed by hydrophobic amino acid residues packed in a "knobs-into-holes" arrangement. Most naturally occurring coiled coils, however, also contain buried polar residues, as do the cores of the majority of naturally occurring globular proteins. Two common buried polar residues in both dimeric and trimeric coiled coils are asparagine and glutamine. In dimeric coiled coils, buried asparagine, but not glutamine, residues have been shown to confer specificity of oligomerization. We have placed a glutamine residue in the otherwise hydrophobic interior of a stable trimeric coiled coil, GCN4-pII, to study the effect of this buried polar residue in a trimeric coiled-coil environment. The resulting peptide, GCN4-pIQI, is a discrete, trimeric coiled coil with a lower stability than GCN4-pII. The crystal structure determined to 1.8 A shows that GCN4-pIQI is a trimeric coiled coil with a chloride ion coordinated by one buried glutamine residue from each monomer.

PubMed: 9837709
DOI: 10.1006/jmbi.1998.2214

Experimental method

X-RAY DIFFRACTION (1.8 Å)