Author
Alexander N. Glazer
Other affiliations: Pasteur Institute, University of California, Los Angeles, Lawrence Berkeley National Laboratory ...read more
Bio: Alexander N. Glazer is an academic researcher from University of California, Berkeley. The author has contributed to research in topics: Phycobilisome & Phycocyanin. The author has an hindex of 71, co-authored 208 publications receiving 21068 citations. Previous affiliations of Alexander N. Glazer include Pasteur Institute & University of California, Los Angeles.
Papers published on a yearly basis
Papers
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TL;DR: The behavior of preformed double-stranded DNA-dye complexes on agarose slab gel electrophoresis in 40 mM Taps-NPe+4, 1 mM H2EDTA, pH 8.2 is reported, where there is little dye transfer between labeled and unlabeled DNA molecules.
14 citations
TL;DR: Ten sexually reproducing strains of Callithamnion have been used in a comparison of phycoerythrin, interfertility and morphology and all cultures showed very similar mobilities in SDS gels.
Abstract: Ten sexually reproducing strains of Callithamnion have been used in a comparison of phycoerythrin, interfertility and morphology. Four isolates of C. byssoides Harvey from North America (Massachusetts, New York, North Carolina and Georgia) are all interfertile and they also hybridize with C. halliae Collins (UTEX LB1411) from Texas. Norwegian C. byssoides and C. roseum (Roth) Lyngbye (sensu Harvey) isolates are not interfertile with any North American strain. Phycoerythrins were compared by absorption spectroscopy, SDS gel electrophoresis and Ouchterlony double diffusion techniques. The absorption spectrum of phycoerythrin from the Massachusetts C. roseum is different from that of the R-phycoerythrin typical of all other strains. The subunits of phycoerythrin from all cultures showed very similar mobilities in SDS gels. Phycoerythrin from all C. byssoides and C. halliae reacted identically in Ouchterlony plates. Antigenic identity with C. byssoides was also seen with one strain (an unidentified species fr...
13 citations
TL;DR: The data presented here strongly support the suggestion made by some earlier investigators that the nitrogenase family had already evolved in the last common ancestor of the Archaea and Bacteria.
Abstract: Author(s): Glazer, Alexander N; Kechris, Katerina J | Abstract: This study examines the structural features and phylogeny of the α subunits of 69 full-length NifD (MoFe subunit), VnfD (VFe subunit), and AnfD (FeFe subunit) sequences. Methodology/Principal Findings: The analyses of this set of sequences included BLAST scores, multiple sequence alignment, examination of patterns of covariant residues, phylogenetic analysis and comparison of the sequences flanking the conserved Cys and His residues that attach the FeMo cofactor to NifD and that are also conserved in the alternative nitrogenases. The results show that NifD nitrogenases fall into two distinct groups. Group I includes NifD sequences from many genera within Bacteria, including all nitrogen-fixing aerobes examined, as well as strict anaerobes and some facultative anaerobes, but no archaeal sequences. In contrast, Group II NifD sequences were limited to a small number of archaeal and bacterial sequences from strict anaerobes. The VnfD and AnfD sequences fall into two separate groups, more closely related to Group II NifD than to Group I NifD. The pattern of perfectly conserved residues, distributed along the full length of the Group I and II NifD, VnfD, and AnfD, confirms unambiguously that these polypeptides are derived from a common ancestral sequence.Conclusions/Significance:There is no indication of a relationship between the patterns of covariant residues specific to each of the four groups discussed above that would give indications of an evolutionary pathway leading from one type of nitrogenase to another. Rather the totality of the data, along with the phylogenetic analysis, is consistent with a radiation of Group I and II NifDs, VnfD and AnfD from a common ancestral sequence. All the data presented here strongly support the suggestion made by some earlier investigators that the nitrogenase family had already evolved in the last common ancestor of the Archaea and Bacteria.
13 citations
TL;DR: Putative bilin-contacting residues differing between the two phycocrythrins were identified which may determine bilin specificity, and are compared to class II phycoerythrin from Synechococcus sp.
Abstract: Genes encoding the α and β subunits of class II phycoerythrin from Synechococcus sp. strain WH8103 were cloned and sequenced. The deduced amino acid sequences were compared to class II phycoerythrin from Synechococcus sp. strain WH8020 and found to share 92% identity, yet the proteins differ in the bilin isomer (phycoerythrobilin versus phycourobilin) bound to two of the six chromophore attachment sites. Amino acid residues which might contact the bilin at each of the two variable sites were inferred by sequence alignment with phycocyanins. Putative bilin-contacting residues differing between the two phycocrythrins were identified which may determine bilin specificity.
12 citations
TL;DR: Th Thin fibers, which appeared to originate from only one end of the flagellar filament, were formed upon trypsin digestion, and the amino acid composition of the purified fibers was very different from that of intact Salmonella flageLLin, andThe fibers did not cross-react with antiflagellin or antif ladellar antiserum.
Abstract: Sheared flagella of Salmonella typhimurium strains SL 870 (Nml(+)Fla(+)) and SL 871 (Nml(-)Fla(+)) were found to be susceptible to proteolytic digestion by trypsin, chymotrypsin, and Pronase. The rate of tryptic digestion was similar for the epsilon-N-methyllysine-containing and the nonmethylated flagella. Thin fibers, which appeared to originate from only one end of the flagellar filament, were formed upon trypsin digestion. The fibers were not dissociated at extremes of pH or upon heating. The amino acid composition of the purified fibers was very different from that of intact Salmonella flagellin, and the fibers did not cross-react with antiflagellin or antiflagellar antiserum. The possible significance of these findings is discussed in relation to the flagellar structure.
10 citations
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TL;DR: The results of an international collaboration to produce and make freely available a draft sequence of the human genome are reported and an initial analysis is presented, describing some of the insights that can be gleaned from the sequence.
Abstract: The human genome holds an extraordinary trove of information about human development, physiology, medicine and evolution. Here we report the results of an international collaboration to produce and make freely available a draft sequence of the human genome. We also present an initial analysis of the data, describing some of the insights that can be gleaned from the sequence.
22,269 citations
28 Jul 2005
TL;DR: PfPMP1）与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作�ly.
Abstract: 抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。
18,940 citations
01 Jan 1969
10,262 citations
TL;DR: Semiconductor nanocrystals prepared for use as fluorescent probes in biological staining and diagnostics have a narrow, tunable, symmetric emission spectrum and are photochemically stable.
Abstract: Semiconductor nanocrystals were prepared for use as fluorescent probes in biological staining and diagnostics. Compared with conventional fluorophores, the nanocrystals have a narrow, tunable, symmetric emission spectrum and are photochemically stable. The advantages of the broad, continuous excitation spectrum were demonstrated in a dual-emission, single-excitation labeling experiment on mouse fibroblasts. These nanocrystal probes are thus complementary and in some cases may be superior to existing fluorophores.
8,542 citations
TL;DR: Highly luminescent semiconductor quantum dots (zinc sulfide-capped cadmium selenide) have been covalently coupled to biomolecules for use in ultrasensitive biological detection and these nanometer-sized conjugates are water-soluble and biocompatible.
Abstract: Highly luminescent semiconductor quantum dots (zinc sulfide-capped cadmium selenide) have been covalently coupled to biomolecules for use in ultrasensitive biological detection. In comparison with organic dyes such as rhodamine, this class of luminescent labels is 20 times as bright, 100 times as stable against photobleaching, and one-third as wide in spectral linewidth. These nanometer-sized conjugates are water-soluble and biocompatible. Quantum dots that were labeled with the protein transferrin underwent receptor-mediated endocytosis in cultured HeLa cells, and those dots that were labeled with immunomolecules recognized specific antibodies or antigens.
7,393 citations