INSIBIO   05451
INSTITUTO SUPERIOR DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
HOMOLOGY OF A GLYCOPROTEIN OF B. arenarumEGG VITELLINE ENVELOPE COMPONENTS WITH ZONA PELLUCIDA
Autor/es:
BARRERA D.; LLANOS R.; GARCÍA V.; MICELI D.
Lugar:
´Rosario Santa Fé, Argentina
Reunión:
Congreso; XLIIReunión Anual de SAIB; 2006
Institución organizadora:
SAIB
Resumen:
HOMOLOGY OF A GLYCOPROTEIN OF B. arenarum
EGG VITELLINE ENVELOPE WITH ZONA PELLUCIDA
COMPONENTS.
Barrera, Daniel; Llanos, Ricardo J.; García, Vanesa; Miceli,
Dora C..
Inst Sup. de Invests. Biológs. INSIBIO (CONICET-UNT),
Chacabuco 461, 4000, Tucumán, Argentina. E-mail:
abarrera@fbqf.unt.edu.ar.r.
In previous work, the morphological and biochemical changes in
B. arenarum eggs envelopes following passage through the oviduct
were reported. The transformation of coelomic envelope (CE) into
vitelline envelopes (VE) leads to the acquisition of fertilizability
and involves the cleavage of glycoprotein components. The
differences between electrophoretic patterns of CE and VE
indicated that an oviducal protease (oviductin) digests CE
glycoproteins gp84 and gp55 decreasing the relative concentrations
of gp48 and gp42 with a noticeable increase in gp39. The aims of
this work were to know gp39 identity and evaluate its expression
pattern in the oocytes during oogenesis. In order to localize gp39 in
the egg we performed immunohistochemical studies with
polyclonal antibody (AB) obtained in rabbit using purified gp39 as
antigen. The specificity of AB determined by Western Blot showed
that AB specifically reacts with gp39 of the envelopes obtained
from eggs after their passage along the oviduct. However AB
recognized also gp55, 48 and 42 on envelopes obtained from eggs
previous their transit through the oviduct. On the other hand three
peptides from trypsin digestion of gp39 were obtained by
preparative HPLC and sequenced. Bioinformatic analyses showed
that these peptides have 100% identity with a deduced sequence of
ZPC homologue cDNA extracted from B.arenarum ovary.B.arenarum ovary.