Molecular Cloning and Expression of the Mouse N-Acetylneuraminic Acid 9-Phosphate Synthase Which Does Not Have Deaminoneuraminic Acid (KDN) 9-Phosphate Synthase Activity
“…The primers, based on the mouse adipo Q nucleotide sequence (GenBank TM accession number U49915) used were 5Ј-GTTGGATGGCAGGCATCC-3Ј (nucleotides 122-140) and 5Ј-CCTG-GAGCCAGACTTGGTC-3Ј (nucleotides 634 -652). 3Ј-and 5Ј-rapid amplification of cDNA ends were carried out as described previously (22). Nucleotide sequences of the cloned cDNAs were determined by the dideoxy chain termination method (23) on a DNA sequencer model 373 (Applied Biosystems).…”
Recently, we have shown that ␣2,8-linked disialic acid (diSia) residue occurs in glycoproteins more frequently than ever recognized (Sato, C., Fukuoka, H., Ohta, K., Matsuda, T., Koshino, R., Kobayashi K., Troy, F. A., II, and Kitajima, K.
“…The primers, based on the mouse adipo Q nucleotide sequence (GenBank TM accession number U49915) used were 5Ј-GTTGGATGGCAGGCATCC-3Ј (nucleotides 122-140) and 5Ј-CCTG-GAGCCAGACTTGGTC-3Ј (nucleotides 634 -652). 3Ј-and 5Ј-rapid amplification of cDNA ends were carried out as described previously (22). Nucleotide sequences of the cloned cDNAs were determined by the dideoxy chain termination method (23) on a DNA sequencer model 373 (Applied Biosystems).…”
Recently, we have shown that ␣2,8-linked disialic acid (diSia) residue occurs in glycoproteins more frequently than ever recognized (Sato, C., Fukuoka, H., Ohta, K., Matsuda, T., Koshino, R., Kobayashi K., Troy, F. A., II, and Kitajima, K.
“…cDNA Cloning of WGA16 -Preparation of total RNA and oligo(dT)-derived cDNA from pig male reproductive organs (testis, epididymis, seminal vesicles, prostate, and bulbourethral glands) and rapid amplification of cDNA ends (RACE) were performed as described previously (30). Based on a partial amino acid sequence that was identified as homologous to ZG16 homolog B from S. scrofa, the cDNA fragment for WGA16 was amplified by reverse transcription polymerase chain reaction (RT-PCR) from prostate and bulbourethral glands using the following primers: ZG16-F-P (5Ј-CAGATGT-TCGGGAACGGAAAAGGCTCC-3Ј) and ZG16-R-P (5Ј-TATAATGTGCTCGCCGGGNTGCAGGAT-3Ј).…”
Section: Sds-page/lectin Blotting and Westernmentioning
Background: Mechanisms of glycoprotein redistribution during sperm capacitation remain unclear. Results: Prostate-specific ZG16-like lectin WGA16 was discovered in sperm lipid rafts. Its primary and crystal structure and GalT-and heparin-binding properties were characterized. Conclusion: Attachment to sperm via surface GalT and capacitation-induced detachment involve unique N-glycans and the heparin-binding domain. Significance: This is the first demonstration of a glycan-mediated mechanism for transient existence of seminal plasma glycoprotein on the sperm surface.
“…This plasmid had a unique EcoRI site within the v-cath open reading frame, which was used to insert an in-frame E. coli LacZ fragment encoding a functional β-galactosidase protein and produce a new baculovirus transfer plasmid, pAcVcath-LacRI. In parallel, we excised a KpnI fragment encoding murine SAS (Nakata et al, 2000) and CMP-SAS (Munster et al, 1998) under the transcriptional control of dual AcMNPV ie1 promoters and the AcMNPV hr5 enhancer element from p64KDIE1TV1/SAS/CMP-SAS and then blunted the ends and subcloned it into the unique EcoRI site (blunted) of p64KTV1ΔK/NΔS/P to produce another baculovirus transfer plasmid, pAcSWT-7. Both of these new transfer plasmids were isolated from large-scale bacterial cultures by standard alkaline lysis and CsCl-ethidium bromide density gradient ultracentrifugation methods, as described previously (Sambrook et al, 1989), and their genetic structures were confirmed by restriction mapping.…”
Section: Construction Of Baculovirus Transfer Plasmidsmentioning
confidence: 99%
“…AcSWT-7B encodes two murine enzymes, SAS (Nakata et al, 2000) and CMP-SAS (Munster et al, 1998), which can convert N-acetylmannosamine through a sialic acid intermediate to the nucleotide sugar, CMP-sialic acid (Fig. 1).…”
Section: Isolation Of a Recombinant Baculovirus Encoding Murine Cmp-smentioning
The inability to sialylate recombinant glycoproteins is a critical limitation of the baculovirusinsect cell expression system. This limitation is due, at least in part, to the absence of detectable sialyltransferase activities and CMP-sialic acids in the insect cell lines routinely used as hosts in this system. SfSWT-1 is a transgenic insect cell line encoding five mammalian glycosyltransferases, including sialyltransferases, which can contribute to sialylation of recombinant glycoproteins expressed by baculovirus vectors. However, sialylation of recombinant glycoproteins requires culturing SfSWT-1 cells in the presence of fetal bovine serum or another exogenous source of sialic acid. To eliminate this requirement and extend the utility of SfSWT-1 cells, we have isolated a new baculovirus vector, AcSWT-7B, designed to express two mammalian enzymes that can convert N-acetylmannosamine to CMP-sialic acid during the early phase of infection. AcSWT-7B was also designed to express a model recombinant glycoprotein during the very late phase of infection. Characterization of this new baculovirus vector showed that it induced high levels of intracellular CMP-sialic acid and sialylation of the recombinant Nglycoprotein upon infection of SfSWT-1 cells cultured in serum-free medium supplemented with N-acetylmannosamine. In addition, co-infection of SfSWT-1 cells with AcSWT-7B plus a conventional baculovirus vector encoding human tissue plasminogen activator resulted in sialylation of this recombinant N-glycoprotein under the same culture conditions. These results demonstrate that AcSWT-7B can be used in two different ways to support recombinant Nglycoprotein sialylation by SfSWT-1 cells in serum-free medium. Thus, AcSWT-7B can be used to extend the utility of this previously described transgenic insect cell line for recombinant sialoglycoprotein production.
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