Conformational change of spermidine upon interaction with adenosine triphosphate in aqueous solution.
Endogenous polyamines, represented by putrescine, spermidine, and spermine, are known to exert their physiological functions by interacting with polyanionic biomolecules such as DNA, RNA, adenosine triphosphate (ATP), and phospholipids. Very few examples of conformation analysis have been reported for these highly flexible polymethylene compounds, mainly due to the lack of appropriate methodologies. To understand the molecular basis of the weak interaction between polyamines and polyanions that underlies their physiological functions, we aimed to elucidate the solution conformation of spermidine by using diastereospecifically deuterated and (13)C-labeled derivatives (1-7), which were designed to diagnose the orientation of seven conformationally relevant bonds in spermidine. (1)H-(1)H and (13)C-(1)H NMR coupling constants ((3)J(H,H) and (3)J(C,H)) were successfully determined for a spermidine-ATP complex. The relevant coupling constants markedly decreased upon complexation. The results reveal that spermidine, when interacting with ATP, undergoes changes that make the conformation more bent and forms the complex with the triphosphate part of ATP in an orientation-sensitive manner.
Maruyoshi
Keisuke
K
Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
Nonaka
Kaori
K
Sagane
Takeshi
T
Demura
Tetsuo
T
Yamaguchi
Toshiyuki
T
Matsumori
Nobuaki
N
Oishi
Tohru
T
Murata
Michio
M
D000255:Adenosine Triphosphate / Q000737:chemistry* / Q000378:metabolism*; D002247:Carbon Isotopes / Q000737:chemistry; D003903:Deuterium / Q000737:chemistry; D003959:Diamines / Q000737:chemistry / Q000378:metabolism; D006860:Hydrogen Bonding; D007536:Isomerism; D007553:Isotope Labeling; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D011122:Polyphosphates / Q000737:chemistry / Q000378:metabolism; D011700:Putrescine / Q000737:chemistry / Q000378:metabolism; D013095:Spermidine / Q000031:analogs & derivatives / Q000737:chemistry* / Q000378:metabolism*; D014867:Water / Q000737:chemistry
D002247:Carbon Isotopes; D003959:Diamines; D011122:Polyphosphates; D014867:Water; C070006:1,2-diaminopropane; D000255:Adenosine Triphosphate; D003903:Deuterium; C005692:triphosphoric acid; D013095:Spermidine; D011700:Putrescine