Naslov
Structures of Three Biologically Active Conjugates of omega-Amino Acids and Plant Growth Hormone (Auxin)

Autori
Nigović, Biljana ; Kojić-Prodić, Biserka ; Puntarec, Vitomir

Izvornik
Acta crystallographica. Section B, Structural science (0108-7681) 48 (1992), 3; 297-302

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
crystal structure ; plant growth hormone ; auxin

Sažetak
The crystal structures of biologically active conjugates of the plant growth hormone, indole-3-acetic acid (IAA=auxin) with the non-natural omega-amino acids beta-alanine (1), gama-aminobutyric acid (2) and epsilon-aminohexanoic acid (3) have been determined. The indole ring system and C atom of the adjacent nethylene group are coplanar. The CH2-carbonyl bond is approximately perpendicular to this plane. In the structures (1) and (3) the peptide O atom points away from the indole ring whereas in (2) the torsion angle is 45.1. The orientations of the amino-acid chains with respect to the aromatic rings are also different. However, the conformation of the indole moiety and the two adjacent C atom is identical for the structures described. Thus the indole NH group is not sterically blocked and remains available for interaction with proteins of specific enzymes.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Biologija

POVEZANOST RADA