TY - JOUR
T1 - Interaction of antibiotic lasalocid A (X537A) with praseodymium(III) in methanol
AU - Chen, Shuenn tzong
AU - Springer, Charles S.
PY - 1978
Y1 - 1978
N2 - The binding of lasalocid A (X537A) to Pr(III) in methanol has been studied by lasalocid fluorescence, circular dichtoism, and 1H and 13C NMR spectroscopy. It is clear that in addition to a mono complex, bis and tris complexes are also formed. Values of the binding constants and spectral properties of the various complexes have been determined by computer fitting of the binding isotherms. The Pr(III) ion binds only at the salicylic "head" of the lasalocid A, in stark contrast with other known structures. The lasalocid A appears to have an "open" conformation in these complexes. The relevance of these results to the structure and conformation of the Ca(II) complex is discussed. The first order rate constant for the dissociation of the tris complex has also been determined.
AB - The binding of lasalocid A (X537A) to Pr(III) in methanol has been studied by lasalocid fluorescence, circular dichtoism, and 1H and 13C NMR spectroscopy. It is clear that in addition to a mono complex, bis and tris complexes are also formed. Values of the binding constants and spectral properties of the various complexes have been determined by computer fitting of the binding isotherms. The Pr(III) ion binds only at the salicylic "head" of the lasalocid A, in stark contrast with other known structures. The lasalocid A appears to have an "open" conformation in these complexes. The relevance of these results to the structure and conformation of the Ca(II) complex is discussed. The first order rate constant for the dissociation of the tris complex has also been determined.
UR - http://www.scopus.com/inward/record.url?scp=0018120447&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0018120447&partnerID=8YFLogxK
U2 - 10.1016/S0006-3061(00)80284-7
DO - 10.1016/S0006-3061(00)80284-7
M3 - Article
C2 - 698278
AN - SCOPUS:0018120447
SN - 0006-3061
VL - 9
SP - 101
EP - 122
JO - Bioinorganic Chemistry
JF - Bioinorganic Chemistry
IS - 2
ER -