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Articles 1 - 9 of 9

Full-Text Articles in Biochemistry, Biophysics, and Structural Biology

Enhancement Of Plant Performance And Biochemical Constituents In Field And Hairy Root Production Of Echinacea , Fredy Rolando Romero Orellana Jan 2006

Enhancement Of Plant Performance And Biochemical Constituents In Field And Hairy Root Production Of Echinacea , Fredy Rolando Romero Orellana

Retrospective Theses and Dissertations

Echinacea is a commercially important source of natural products and phytopharmaceuticals. Echinacea products currently constitute a significant portion of the rapidly growing, multi-billion dollar natural products market. This popularity has led to the expansion of commercial cultivation of Echinacea and the need to find alternative methods to meet the increasing demands of the phytopharmaceutical market. Two methods of producing biochemical constituents in commercial use include extraction from field-grown plants and in vitro hairy root production;Echinacea seeds in the wild typically show a high degree of dormancy. In order to enhance Echinacea seed germination for field production, alternative methods to ...


Molecular And Genetic Characterization Of A Biotin Biosynthetic Gene In Arabidopsis Encoding Both 7,8-Diaminopelargonic Acid Aminotransferase And Dethiobiotin Synthetase , Elve Chen Jan 2006

Molecular And Genetic Characterization Of A Biotin Biosynthetic Gene In Arabidopsis Encoding Both 7,8-Diaminopelargonic Acid Aminotransferase And Dethiobiotin Synthetase , Elve Chen

Retrospective Theses and Dissertations

Biotin is an essential enzyme cofactor required for different metabolic processes. Plants are a major source of biotin, however, the genes and the protein products of biotin biosynthetic pathway are not fully characterized. We have molecularly characterized the genetically defined Arabidopsis bio1 locus as encoding 7,8-diaminopelargonic acid (DAPA) aminotransferase. Molecular and genetic analysis revealed that the full length BIO1 cDNA is capable of producing a fusion protein that catalyzes not only DAPA aminotransferase, but also dethiobiotin synthetase (BIO3) which is another enzymatic step in the biotin biosynthetic pathway. We refer to this fusion-gene as BIO3/BIO1. This bifunctional enzyme ...


Release Of Human Brain Hexokinase From The Mitochondrial Membrane , David Andrew Skaff Jan 2006

Release Of Human Brain Hexokinase From The Mitochondrial Membrane , David Andrew Skaff

Retrospective Theses and Dissertations

Type I hexokinase (HKI) is the pacemaker of glycolysis in the brain and red blood cell. Recent work has tied hexokinase association with the mitochondrial membrane to the prevention of apoptosis. With increased hexokinase activity and expression in tumor cells, the importance in understanding the release of HKI from the membrane has become extremely important. Glucose 6-phosphate and nucleotides have been shown to effectively release HKI from the membrane; however, the mechanisms by which these molecules can induce release have never been studied;Expressed recombinant HKI protein was lacking the N-terminus that is required for binding to the mitochondrial membrane ...


Signaling Capabilities Of A Novel H-Ras Mutant From The Golgi Apparatus , Daniel R. Zamzow Jan 2006

Signaling Capabilities Of A Novel H-Ras Mutant From The Golgi Apparatus , Daniel R. Zamzow

Retrospective Theses and Dissertations

The paradigm that H-Ras needs to be attached to the plasma membrane to signal has been put into question in the last decade. New insights into H-Ras signaling point to a biological requirement for signaling from endomembranes.;This thesis will demonstrate the abilities of a unique H-Ras mutant that accumulates on the Golgi.


Synthesis Of Tetrasubstituted Olefins And Aryl Ketones Via Carbopalladation Of Alkynes And Nitriles , Chengxiang Zhou Jan 2006

Synthesis Of Tetrasubstituted Olefins And Aryl Ketones Via Carbopalladation Of Alkynes And Nitriles , Chengxiang Zhou

Retrospective Theses and Dissertations

Palladium-catalyzed reactions are versatile methods for carbon-carbon bond formation due to their generality and ability to tolerate a wide range of important organic functional groups. Developing novel Palladium-catalyzed reactions has therefore been of great interest to synthetic chemists for years;The regio- and stereoselective synthesis of tetrasubstituted olefins is a long-pursuing challenge for synthetic chemists. A multi-component reaction route is ideal to generate various tetrasubstituted olefins in a very concise manner and should be highly desirable for applications in combinatorial chemistry. A highly efficient, regio- and stereoselective route to tetrasubstituted olefins has been developed by the Pd-catalyzed three-component reaction of ...


Chemical Reagents In The Study Of Biomolecules , Laura-Mirela Dutcă Jan 2006

Chemical Reagents In The Study Of Biomolecules , Laura-Mirela Dutcă

Retrospective Theses and Dissertations

Chemical reagents are an important tool in the study of biological systems. In this thesis some applications of chemical reagents in the study of biomolecules are presented. Selective cleavage of proteins is a common procedure in many biochemical applications ranging from standard protein sequencing to novel methods in proteomics and bioengineering. Pt(II) complexes are synthetic proteases, with the same selectivity as cyanogen bromide, they cleave at the C-terminus of methionine residues. Pt(II) reagent has several advantages over cyanogen bromide. For example, cyanogen bromide irreversibly converts methionine residues to serine lactone in 70% formic acid, while Pt(II) reagents ...


An Examination Of Hexacoordinate Hemoglobins Using The Techniques Of Biochemistry, Biophysics And Molecular Biology , James Thomas Trent Iii Jan 2006

An Examination Of Hexacoordinate Hemoglobins Using The Techniques Of Biochemistry, Biophysics And Molecular Biology , James Thomas Trent Iii

Retrospective Theses and Dissertations

Hexacoordinate hemoglobins are found in a truly diverse array of organisms, ranging from cyanobacteria to humans. The prevalence of these proteins in nature coupled with very high sequence identity between species homologues suggests they have a role vital to life. The high sequence identity also implies that hxHb structural features, including the hexacoordination phenomenon, are critical aspects of the physiological function. A detailed understanding of the ligand binding behavior of these proteins will not only facilitate efforts towards discovering their physiological role(s), but will also help explain how hxHbs perform their function. This dissertation consists of four published papers ...


Development Of Aptamer Based Targeted Reversibly Attenuated Probes , Xiangyu Cong Jan 2006

Development Of Aptamer Based Targeted Reversibly Attenuated Probes , Xiangyu Cong

Retrospective Theses and Dissertations

The targeted reversely attenuated probe (TRAP) is an aptamer-based biosensor in which the aptamer activity can be regulated by a specific nucleic acid sequence such as an mRNA. The TRAP has the potential of being developed for imaging gene expression in vivo. The central portion of the TRAP, between the aptamer and the attenuator, is complementary to a target nucleic acid, such as an mRNA, which is referred to as a regulatory nucleic acid (regDNA);I developed 8att-cmRas20 and 9att-cmRas15 ATP DNA TRAPs with regDNA-dependent aptamer activity. The results suggested that, as well as inhibiting the aptamer, the attenuator also ...


Cloning, Expression, And Characterization Of A Recombinant Bifunctional Protein -- Porcine Air Carboxylase And Saicar Synthetase , Xin Gao Jan 2006

Cloning, Expression, And Characterization Of A Recombinant Bifunctional Protein -- Porcine Air Carboxylase And Saicar Synthetase , Xin Gao

Retrospective Theses and Dissertations

The conversion of aminoimidazole ribonucleotide (AIR) to carboxyaminoimidazole ribonucleotide (CAIR) by phosphoribosylaminoimidazole carboxylase (AIR carboxylase) and the conversion of conversion of ATP, L-aspartate and CAIR to 5-aminoimidazole-4-(N-succinylcarboxamide) ribonucleotide (SAICAR), ADP and phosphate by phosphoribosylaminoimidazolesuccinocarboxamide synthetase (SAICAR synthetase) represent the 7th and 8th steps respectively of de novo purine nucleotide biosynthesis. For the vertebrate enzyme system, AIR carboxylase and SAICAR synthetase are combined in a bifunctional protein encoded by a single gene. Here, a porcine gene encoding AIR carboxylase/SAICAR synthetase was cloned and expressed in Escherichia coli. The native molecular weight of the purified recombinant protein infers an octameric ...