1ERD

THE NMR SOLUTION STRUCTURE OF THE PHEROMONE ER-2 FROM THE CILIATED PROTOZOAN EUPLOTES RAIKOVI

Summary for 1ERD

• Entry DOI: 10.2210/pdb1erd/pdb
• Descriptor: PHEROMONE ER-2 (1 entity in total)
• Functional Keywords: pheromone
• Biological source: Euplotes raikovi
• Total number of polymer chains: 1
• Total formula weight: 4303.97

Authors

Ottiger, M.,Szyperski, T.,Luginbuhl, P.,Ortenzi, C.,Luporini, P.,Bradshaw, R.A.,Wuthrich, K. (deposition date: 1994-02-14, release date: 1994-10-15, Last modification date: 2024-10-09)

Primary citation

Ottiger, M.,Szyperski, T.,Luginbuhl, P.,Ortenzi, C.,Luporini, P.,Bradshaw, R.A.,Wuthrich, K.
The NMR solution structure of the pheromone Er-2 from the ciliated protozoan Euplotes raikovi.
Protein Sci., 3:1515-1526, 1994

PubMed Abstract: The NMR structure of the pheromone Er-2 from the ciliated protozoan Euplotes raikovi has been determined in aqueous solution. The structure of this 40-residue protein was calculated with the distance geometry program DIANA from 621 distance constraints and 89 dihedral angle constraints; the program OPAL was employed for the energy minimization. For a group of 20 conformers used to characterize the solution structure, the average pairwise RMS deviation from the mean structure calculated for the backbone heavy atoms N, C alpha, and C' of residues 3-37 was 0.31 A. The molecular architecture is dominated by an up-down-up bundle of 3 short helices of residues 5-11, 14-20, and 23-33, which is similar to the structures of the homologous pheromones Er-1 and Er-10. Novel structural features include a well-defined N-cap on the first helix, a 1-residue deletion in the second helix resulting in the formation of a 3(10)-helix rather than an alpha-helix as found in Er-1 and Er-10, and the simultaneous presence of 2 different conformations for the C-terminal tetrapeptide segment, i.e., a major conformation with the Leu 39-Pro 40 peptide bond in the trans form and a minor conformation with this peptide bond in the cis form.

PubMed: 7833811

Experimental method

SOLUTION NMR