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Envelope-associated nucleoids have been isolated from Caulobacter crescentus by using a modification of the procedure of T. Kornberg et al. (Proc. Natl. Acad. Sci. U.S.A. 71:3189-3193, 1974). The development of a Ludox density gradient procedure has permitted preparation of large quantities of synchronous cells. The sedimentation coefficients of the(More)
Shape changes, extended processes, and other surface elaborations are associated with cellular differentiation, and the cell membranes involved with these developmental changes often are reshaped without a major alteration in biochemical composition. Caulobacter crescentus produces a hexagonally-packed periodic surface layer that covers the entire cell and(More)
Secreted aspartyl proteinases are putative virulence factors in Candida infections. Candida albicans possesses at least nine members of a SAP gene family, all of which have been sequenced. Although the expression of the SAP genes has been extensively characterized under laboratory growth conditions, no studies have analyzed in detail the in vivo expression(More)
First characterized in Trypanosoma brucei, the spliced leader-associated (SLA) RNA gene locus has now been isolated from the kinetoplastids Leishmania tarentolae and Trypanosoma cruzi. In addition to the T. brucei SLA RNA, both L. tarentolae and T. cruzi SLA RNA repeat units also yield RNAs of 75 or 76 nucleotides (nt), 92 or 94 nt, and approximately 450 or(More)
Molecular processes which promote the spatial localization of subcellular components are fundamental to cell development and differentiation. At various stages in development unequal segregation of molecular information must occur to result in the differentiated characteristics which distinguish cell progeny. Biological attributes of the dimorphic(More)
We have analyzed antigenic variants with a known lineage and show that there are several telomeres on which variant surface glycoprotein (VSG) genes can be expressed. These telomeres have similar restriction maps 5' to the barren region. In addition, the same VSG gene was expressed on different telomeres. Some antigenic switches in the lineage were(More)
Recent sequencing and assembly of the genome for the fungal pathogen Candida albicans used simple automated procedures for the identification of putative genes. We have reviewed the entire assembly, both by hand and with additional bioinformatic resources, to accurately map and describe 6,354 genes and to identify 246 genes whose original database entries(More)
We have examined the organization of genomic sequences homologous to the spliced leader of Trypanosoma brucei variant surface glycoprotein (VSG) mRNA, using a synthetic oligodeoxynucleotide probe. These sequences are highly reiterated in the trypanosome genome and most are located in 1.4 kb units arranged in a direct tandem repeat. However, some of the 1.4(More)
We present evidence that addition of the 35 nucleotide spliced leader (SL) to the 5' end of T. brucei mRNAs occurs via trans RNA splicing. A 100 nucleotide fragment of the 135 base SL RNA (100-mer) is revealed by S1 nuclease analysis of total and poly(A)+ RNA. This 100-mer is not detected by Northern hybridization analysis, indicating that it does not exist(More)