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Full-Text Articles in Molecular Biology

Circular Dichroism And Molecular Modeling Yield A Structure For The Complex Of Human Immunodeficiency Virus Type 1 Trans-Activation Response Rna And The Binding Region Of Tat, The Trans-Acting Transcriptional Activator, Erwann P. Loret, Philippe T. Georgel, W. Curtis Johnson Jr., Pui Shing Ho Oct 1992

Circular Dichroism And Molecular Modeling Yield A Structure For The Complex Of Human Immunodeficiency Virus Type 1 Trans-Activation Response Rna And The Binding Region Of Tat, The Trans-Acting Transcriptional Activator, Erwann P. Loret, Philippe T. Georgel, W. Curtis Johnson Jr., Pui Shing Ho

Biological Sciences Faculty Research

Transcription in the human immunodeficiency virus type 1 (HIV-1) retrovirus is regulated by binding the viral Tat protein (trans-acting transcriptional activator) to the trans-activation response (TAR) RNA sequence. Here, vacuum UV circular dichroism (VUV-CD) is used to study the structure of TAR and its complex with two peptide fragments that are important for Tat binding to TAR. The VUV-CD spectrum of TAR is typical of A-form RNA and is minimally perturbed when bound to either the short or the long Tat peptide. The CD spectra ofthe complexes indicate an extended structure in the argnine-rich region of Tat from amino acid ...


Saccharomyces Cerevisiae Sec59 Cells Are Deficient In Dolichol Kinase Activity, Loree Heller, Peter Orlean, W. Lee Adair Jr. Aug 1992

Saccharomyces Cerevisiae Sec59 Cells Are Deficient In Dolichol Kinase Activity, Loree Heller, Peter Orlean, W. Lee Adair Jr.

Bioelectrics Publications

The temperature-sensitive Saccharomyces cerevisiae mutant sec59 accumulates inactive and incompletely glycosylated protein precursors in its endoplasmic reticulum at the restrictive temperature. O-mannosylation and glycosyl phosphatidylinositol membrane anchoring of protein are also abolished, consistent with a deficiency in dolichyl phosphate mannose. Membranes prepared from sec59 cells that had been shifted to the restrictive temperature, however, made normal amounts of dolichyl phosphate mannose when exogenous dolichyl phosphate was supplied, but dolichyl phosphate mannose synthesis was severely depressed in the absence of exogenous dolichyl phosphate. Quantitative measurements of dolichyl phosphate in sec59 cells showed that the levels were decreased to 48% of wild ...


Isolation And Characterization Of The Triiodothyronine Regulatory Region Of The Fatty Acid Synthase Gene In Avian Species, Delfina Rivera Valencia Aug 1992

Isolation And Characterization Of The Triiodothyronine Regulatory Region Of The Fatty Acid Synthase Gene In Avian Species, Delfina Rivera Valencia

Master's Theses

Fatty acids are utilized for energy storage in the form of triglycerides or neutral fats. One way to regulate fatty acid biosynthesis is to regulate the activity of fatty acid synthase (FAS), the enzyme that catalyzes the reaction. Previous studies have shown that regulation of FAS activity and synthesis is regulated by the hormone triiodothyronine, T3, at the level of transcription. Thus, isolation and characterization of the promoter region o f the FAS gene will enable the identification of the thyroid hormone response elements (TREs). This study could shed light on the mechanisms on how this gene can be ...


Protein Translocation Across The Er Requires A Functional Gtp Binding Site In The Alpha Subunit Of The Signal Recognition Particle Receptor, Peter J. Rapiejko, Reid Gilmore May 1992

Protein Translocation Across The Er Requires A Functional Gtp Binding Site In The Alpha Subunit Of The Signal Recognition Particle Receptor, Peter J. Rapiejko, Reid Gilmore

Open Access Articles

The signal recognition particle (SRP)-mediated translocation of proteins across the RER is a GTP dependent process. Analysis of the primary amino acid sequence of one protein subunit of SRP (SRP54), as well as the alpha subunit of the SRP receptor (SR alpha), has indicated that these proteins contain predicted GTP binding sites. Several point mutations confined to the GTP binding consensus elements of SR alpha were constructed by site specific mutagenesis to define a role for the GTP binding site in SR alpha during protein translocation. The SR alpha mutants were analyzed using an in vitro system wherein SR ...


Enzyme Cytochemical Localization Of Na,K-Atpase And Immunohistochemical Localization Of Vinculin In Frog And Mouse Liver Tissue, Douglas Mcinnis Apr 1992

Enzyme Cytochemical Localization Of Na,K-Atpase And Immunohistochemical Localization Of Vinculin In Frog And Mouse Liver Tissue, Douglas Mcinnis

Life and Environmental Sciences Undergraduate Theses

Means of localizing molecules are essential in contemporary biological research attempting to unlock the mysteries of how cells function, interact, and go wrong. Enzyme cytochemistry and immunohistochemistry are two methods which utilize different characteristics of given molecules to localize them in tissue. The objective of this study was to localize two proteins, Na,K-ATPase and vinculin, in frog and mouse liver sections using these methods. Na,KATPase activity contributes to overall p-nitrophenylphosphatase (jpNPPase) activity, and sites of p-NPPase activity were determined using an enzyme cytochemical method. Sites of p-NPPase activity were thus extrapolated to indicate regions of probable Na,K-ATPase ...


Cloning And Characterization Of Mink Plasminogen Activator Inhibitor Type 1 (Pai-1) Cdna And The Regulation Of Mink Pai-1 Expression At Mrna Level , Tsung-Hsien Chuang Jan 1992

Cloning And Characterization Of Mink Plasminogen Activator Inhibitor Type 1 (Pai-1) Cdna And The Regulation Of Mink Pai-1 Expression At Mrna Level , Tsung-Hsien Chuang

Retrospective Theses and Dissertations

Mink plasminogen activator inhibitor type 1 (PAI-1) is a glycoprotein with molecular weight about 50 kD and is highly regulated in cultured cells. In mink lung CCL64 epithelial cells, epidermal growth factor (EGF), transforming growth factor-[beta] (TGF-[beta]), and 12-O-tetradecanoyl phorbol-13-acetate (TPA) increase the synthesis of PAI-1. Epidermal growth factor and TGF-[beta] synergistically stimulate the synthesis of PAI-1. The synergistic effect and factors which govern the PAI-1 expression in mink lung CCL64 cells were studied by using a mink PAI-1 cDNA as a probe to detect PAI-1 mRNA;The mink PAI-1 cDNA was cloned from a cDNA library ...


Studies On The Role Of Expression Of Phosphoenolpyruvate Carboxykinase Gene In The Development Of Bovine Lactation Ketosis , Sowmya Moorthi Jan 1992

Studies On The Role Of Expression Of Phosphoenolpyruvate Carboxykinase Gene In The Development Of Bovine Lactation Ketosis , Sowmya Moorthi

Retrospective Theses and Dissertations

Changes in expression of the phosphoenolpyruvate carboxykinase (PEPCK) gene, which codes for a key regulatory enzyme of gluconeogenesis, were studied in bovine liver tissue. Induction of ketosis was attempted in cows by a protocol of restricting feed intake (FR) and supplementing with 1,3-butanediol (BD), a ketogenic precursor, beginning at 15 d postpartum (FRBD protocol). Twenty Holstein cows were distributed in equal numbers among four treatments: normal control, obese control, normal cows given FRBD, and obese cows given FRBD. Liver biopsies were obtained at nine different times during early lactation: 10 d prepartum, 5 and 14 d postpartum (just before ...


Genetic And Biochemical Characterization Of The P21[Superscript Ras]-Related Protein Rho1p In The Yeast Saccharomyces Cerevisiae , Joni Marie Seeling Johnson Jan 1992

Genetic And Biochemical Characterization Of The P21[Superscript Ras]-Related Protein Rho1p In The Yeast Saccharomyces Cerevisiae , Joni Marie Seeling Johnson

Retrospective Theses and Dissertations

Rho1p is a guanine nucleotide binding protein coded for by the Saccharomyces cerevisiae gene RHO1, which is homologous to p21[superscript] ras and other members of the ras superfamily of small molecular weight GTP binding proteins. This protein family is highly conserved in evolution and in some instances is known to be involved in control of cell proliferation. The precise physiological functions of most p21[superscript] ras-related proteins, however, are not known. In order to gain further insight into the physiological function of rho proteins, this research addressed the genetic and biochemical characterization of Rho1p, as well as the subcellular ...


Fluorescence Studies And Consequences Of Amino Acid Substitutions With Escherichia Coli Adenylosuccinate Synthetase , Chandrasen Soans Jan 1992

Fluorescence Studies And Consequences Of Amino Acid Substitutions With Escherichia Coli Adenylosuccinate Synthetase , Chandrasen Soans

Retrospective Theses and Dissertations

Probes were introduced into the active site of adenylosuccinate synthetase from Escherichia coli for fluorescence energy transfer measurements and to measure enzyme conformational changes attending ligand binding. The distances from fluorescent reporter groups covalently bound to a highly reactive cysteinyl residue (Cys[superscript]291) of adenylosuccinate synthetase, to active site binding ligands were determined. Energy transfer from formycin 5[superscript]'-monophosphate, a competitive inhibitor of IMP, to Cys[superscript]291, modified with the fluorescent chromophore N-(iodoacetylaminoethyl)-5-naphthylamine-1-sulfonate, indicated that the chromophores are 17 A apart in the presence or absence of GTP. Analogous experiments using tetramethylrhodamine maleimide to modify ...


Deletion Analysis Of The Starch Binding Domain From Aspergillus Glucoamylase , Luojing Chen Jan 1992

Deletion Analysis Of The Starch Binding Domain From Aspergillus Glucoamylase , Luojing Chen

Retrospective Theses and Dissertations

Glucoamylase (GA) from Aspergillus (EC 3.2.1.3) exists in two forms: GAI (amino acids 1-616) and GAII (amino acids 1-512). GAII is identical to GAI but lacks the C-terminal region (amino acids 513-616). While both forms of glucoamylase are able to digest soluble starch, only GAI has the ability to bind to and therefore hydrolyze native starch granules. To further examine the location of the starch binding domain at the C-terminus of GAI and to determine how many amino acid residues of GAI are required for starch binding, six [beta]-galactosidase fusion proteins were constructed. Affinity purified fusion ...


Glossary For Chemists Of Terms Used In Biotechnology, B. Nagel, H. Dellweg, Lila Gierasch Dec 1991

Glossary For Chemists Of Terms Used In Biotechnology, B. Nagel, H. Dellweg, Lila Gierasch

Lila Gierasch

The glossary contains definitions and explanatory notes, if needed, of over 230 terms frequently used in publications in the multidisciplinary field of biotechnology. The glossary was developed as a step to help facilitate communication between chemists, chemical engineers, biologists and bioengineers and to make biotechnology and its methodologies more accessible to the chemical profession. The interrelation between chemistry, chemical engineering and the burgeoning areas of molecular biology will be especially important as chemical industrial processes begin to incorporate recombinant DNA techniques, for example. The range of terms includes microbiology, genetic engineering, biochemistry, molecular biology, biochemical engineering, bioprocessing and general concepts ...