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A homologous family of UDP- N -acetylgalactosamine: polypeptide N -
acetylgalactosaminyltransferases (GalNAc-transferases) initiate O-
glycosylation. These transferases share overall amino acid sequence
similarities of approximately 45-50%, but segments with higher similarities
of approximately 80% are found in the putative catalytic domain. Here we
have characterized the genomic organization of the coding regions of three
GalNAc-transferase genes and determined their chromosomal localization. The
coding regions of GALNT1 , -T2 , and -T3 were found to span 11, 16, and 10
exons, respectively. Several intron/exon boundaries were conserved within
the three genes. One conserved boundary was shared in a homologous C.
elegans GalNAc- transferase gene. Fluorescence in situ hybridization showed
that GALNT1 , -T2 , and -T3 are localized at chromosomes 18q12-q21,
1q41-q42, and 2q24-q31, respectively. These results suggest that the
members of the polypeptide GalNAc-transferase family diverged early in
evolution from a common ancestral gene through gene duplication.
相似文献
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Pilar del Hoyo Alberto García-Redondo Fernando de Bustos José Antonio Molina Youssef Sayed Hortensia Alonso-Navarro Luis Caballero Joaquín Arenas José AG Agúndez Félix Javier Jiménez-Jiménez 《BMC neurology》2010,10(1):95
Background
In the substantia nigra of Parkinson's disease (PD) patients, increased lipid peroxidation, decreased activities of the mitochondrial complex I of the respiratory chain, catalase and glutathione-peroxidase, and decreased levels of reduced glutathione have been reported. These observations suggest that oxidative stress and mitochondrial dysfunction play a role in the neurodegeneration in PD. We assessed enzymatic activities of respiratory chain and other enzymes involved in oxidative processes in skin fibroblasts cultures of patients with PD. 相似文献25.
HIV-particles in spermatozoa of patients with AIDS and their transfer into the oocyte 总被引:11,自引:1,他引:10 下载免费PDF全文
B Baccetti A Benedetto AG Burrini G Collodel EC Ceccarini N Crisa A Di Caro M Estenoz AR Garbuglia A Massacesi P Piomboni T Renieri D Solazzo 《The Journal of cell biology》1994,127(4):903-914
By immunocytochemistry and in situ hybridization at the electron microscopy level, and by the PCR technique, we have shown that HIV-1 binds and enters normal sperm; that viral particles, their antigens, and nucleic acid are present in sperm from HIV-1 infected men; and that such sperm can transfer HIV-1 like particles to normal human oocytes. We also present evidence that a galactosylceramide-like compound is present on the sperm membrane and could function as an alternative receptor for HIV. 相似文献
26.
Prospects for estimating nucleotide divergence with RAPDs 总被引:11,自引:0,他引:11
The technique of random amplification of polymorphic DNA (RAPD), which is
simply polymerase chain reaction (PCR) amplification of genomic DNA by a
single short oligonucleotide primer, produces complex patterns of anonymous
polymorphic DNA fragments. The information provided by these banding
patterns has proved to be of great utility for mapping and for verification
of identity of bacterial strains. Here we consider whether the degree of
similarity of the banding patterns can be used to estimate nucleotide
diversity and nucleotide divergence. With haploid data, fragments generated
by RAPD-PCR can be treated in a fashion very similar to that for
restriction-fragment data. Amplification of diploid samples, on the other
hand, requires consideration of the fact that presence of a band is
dominant to absence of the band. After describing a method for estimating
nucleotide divergence on the basis of diploid samples, we summarize the
restrictions and criteria that must be met when RAPD data are used for
estimating population genetic parameters.
相似文献
27.
Single-stranded DNA-binding proteins (SSB-proteins) isolated from Ehrlich ascites tumour (EAT) cells were incubated for 30 min at 5 mM NaCl with salmon sperm DNA or [3H]DNA from EAT at the SSB-protein/DNA ratio (w/w) of 0 to 4.5. After addition of sodium dodecyl sulfate up to a 0.05% concentration, the proteins were applied to columns with benzoylated naphthoylated DEAE-cellulose. Double-stranded DNA was eluted by 1 M NaCl; the DNA containing single-stranded regions was eluted by 50% dimethylformamide. There was a progressive lowering of the DNA content in the first eluate and a rise in the second eluate, as could be evidenced from the increase in the SSB-protein/DNA w/w ratio. This effect was more pronounced in the case of homologous DNA and was not coupled with the nuclease activity of SSB proteins. It was concluded that EAT SSB-proteins are "DNA-unwinding" proteins. 相似文献
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Frederique M Moret Cornelis E Hack Kim MG van der Wurff-Jacobs Wilco de Jager Timothy RDJ Radstake Floris PJG Lafeber Joel AG van Roon 《Arthritis research & therapy》2013,15(5):R155