K. Shimanaka et al., NOVEL ANTIBIOTICS, AMYTHIAMICINS .3. STRUCTURE ELUCIDATIONS OF AMYTHIAMICIN-A, AMYTHIAMICIN-B AND AMYTHIMICIN-C, Journal of antibiotics, 47(10), 1994, pp. 1153-1159
The structures of novel antimicrobial antibiotics, amythiamicins A, B
and C, were elucidated by chemical degradations and NMR spectral analy
ses. The main frame from C-1 to C-41 of these antibiotics was the same
as that of amythiamicin D. Amino acid autoanalyses of amythiamicins A
, B and C showed that these have another one mole of serine and prolin
e in comparison with amythiamicin D. Stereochemistries of both amino a
cids were determined to be L by chiral HPLC. These seryl-prolyl residu
es in amythiamicins A, B and C are attached at G41 through an oxazolin
e ring, amide and ester bond, respectively.