Characterization of testicular mouse glucosamine 6-phosphate deaminase (GNPDA).
Mammalian glucosamine 6-phosphate deaminase (GNPDA) was first detected in hamster spermatozoa. To further elucidate its role, we have cloned mouse GNPDA and produced a polyclonal rabbit anti-GNPDA antibody. This antibody recognized a 33 kDa protein in soluble extracts from mouse brain, liver, kidney, muscle, ovary, testis and sperm. Immunofluorescent analysis of the localization of GNPDA in male reproductive tissue revealed its presence in spermatids and in spermatozoa. In spermatids, GNPDA localized close to the developing acrosome vesicle and in spermatozoa close to the acrosomal region. Following the induction of the acrosome reaction, GNPDA fluorescence in spermatozoa was either reduced or GNPDA was absent. These data suggest that GNPDA might play a role in the acrosome reaction.
Montag
M
M
Department of Endocrinology and Reproductive Medicine, University of Bonn, Germany. m.montag@uni-bonn.de
van der Ven
K
K
Dörbecker
C
C
van der Ven
H
H
D000177:Acrosome / Q000201:enzymology / Q000502:physiology; D019747:Aldose-Ketose Isomerases / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D019084:Fluorescent Antibody Technique, Indirect; D007106:Immune Sera / Q000378:metabolism; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D009928:Organ Specificity / Q000235:genetics; D017421:Sequence Analysis; D013075:Sperm Capacitation; D013094:Spermatozoa / Q000201:enzymology / Q000502:physiology; D013737:Testis / Q000201:enzymology*
D007106:Immune Sera; C020582:glucosamine-6-phosphate isomerase; D019747:Aldose-Ketose Isomerases