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2 edition of Protein phosphorylation in Rhodobacter sphaeroides found in the catalog.

Protein phosphorylation in Rhodobacter sphaeroides

Graeme Arthur Macdonald

Protein phosphorylation in Rhodobacter sphaeroides

by Graeme Arthur Macdonald

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Published by typescript in [s.l.] .
Written in English


Edition Notes

Thesis (M.Sc.) - University of Warwick, 1990.

Statementby Graeme Arthur Macdonald.
ID Numbers
Open LibraryOL20153647M

In Rhodobacter, puc promoter controls the expression of the puc operon, which encodes for LHII complex and gets activated by low light intensity as well as reduced oxygen tension. Wild type strain, R. sphaeroides ATCC , was used as a template to PCR amplify the RsAqpZ gene. The soil bacterium Rhizobium meliloti responds to chemotactic stimuli by modulating the rotary speed of its flagella. Unlike in Escherichia coli, the signal transduction chain of R. meliloti contains two different response regulators, CheY1 and CheY2, but no CheZ phosphatase. Phosphorylation of CheY1 and CheY2 by the central ATP-dependent autokinase, CheA, is .

rhodobacter sphaeroides - metabolism () Filter by: Remove filter: rhodobacter sphaeroides () Filter by: Remove filter: kinetics () Filter by: Remove filter: biophysics () Filter by: Remove filter: bacteria () Filter by: Remove filter. most intensively in Rhodobacter sphaeroides and R. capsulatus, in which RegBA is a globally acting, redox-responsive system,7 and in nitrogen-fixing Bradyrhizobium japonicum, in which it is involved in oxygen-responsive regulation of nitrogen fix-ation genes.4 In Rhodobacter, RegB is the mem-brane-located histidine protein kinase (HPK).

Anoxygenic photosynthetic growth of Rhodobacter sphaeroides, a member of the α subclass of the class Proteobacteria, requires the response regulator PrrA. PrrA and the sensor kinase PrrB are part of a two-component signaling pathway that influences a wide range of processes under oxygen-limited conditions. In this work we characterized the pathway of transcription activation . Rhodobacter sphaeroides is a kind of purple bacterium; a group of bacteria that can obtain energy through best growth conditions are anaerobic phototrophy (photoheterotrophic and photoautotrophic) and aerobic chemoheterotrophy in the absence of light. R. sphaeroides is also able to fix nitrogen. It is remarkably metabolically diverse, as it is able .


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Protein phosphorylation in Rhodobacter sphaeroides by Graeme Arthur Macdonald Download PDF EPUB FB2

Two new loci, prrB and prrC, involved in the positive regulation of photosynthesis gene expression in response to anaerobiosis, have been identified in Rhodobacter sphaeroides. prrB encodes a sensor histidine kinase that is responsive to the removal of oxygen and functions through the response regulator by: Sharon Mendel, Colin Robinson, in The Enzymes, 1 Trimethylamine-N-Oxide Reductase, a kDa Molybdoprotein Encoded by the TorA Gene [20]Based on sequence homologies, TorA belongs to the dimethyl sulfoxide (DMSO)/TMAO reductase family which includes the DMSO/TMAO reductases from Rhodobacter capsulatus and Rhodobacter sphaeroides and.

Rhodobacter sphaeroides is able to assemble two different flagella, the subpolar flagellum (Fla1) and the polar flagella (Fla2). In this work, we report the swimming behavior of R. sphaeroides Fla2 + cells lacking each of the proteins encoded by chemotactic operon 1.

A model proposing how these proteins control Fla2 rotation is by: 8. Rhodobacter sphaeroides is a Gram-negative, facultative photosynthetic bacterium.

In addition to photosynthesis, R. sphaeroides shows a wide range of metabolic capabilities that include lithotrophy, aerobic and anaerobic respiration, nitrogen-fixation, and synthesis of tetrapyrroles, chlorophylls, heme, and vitamin B Each cell possesses one. In contrast to the situation in enteric bacteria, chemotaxis in Rhodobacter sphaeroides requires transport and partial metabolism of chemoattractants.

A chemotaxis operon has been identified containing homologues of the enteric cheA, cheW, cheR genes and two homologues of the cheY gene. However, mutations in these genes have only minor effects on Cited by: Both Rhodobacter sphaeroides (formerly Rhodopseudomonas sphaeroides) and Rhodobacter capsulatus have been studied since the s, but herein we focus on R.

sphaeroides. sphaeroides is a member of the α-proteobacteria, and descended from bacteria that eventually became mitochondria in eukaryotic cells (Yang et al., ). Expression of fdp, encoding a fasciclin I domain protein important for adherence in the hydrogen-producing bacterium Rhodobacter sphaeroides, was investigated under a range of conditions to gain insights into optimization of adherence for immobilization strategies suitable for H 2 production.

The fdp promoter was linked to a lacZ reporter and expressed in wild type and in. Explore the latest full-text research PDFs, articles, conference papers, preprints and more on CELLULAR MICROBIOLOGY.

Find methods information, sources, references or conduct a literature review. The LH1–RC core complex of Rhodobacter sphaeroides: interaction between components, time-dependent assembly, and topology of the PufX protein.

Biochimica et Biophysica Acta (BBA) - Bioenergetics(3), The fusion protein localized mainly to one pole of aerobically grown R.

sphaeroides cells, with a lower level of fluorescence being seen at the second pole of cells that were obviously dividing. This pattern of fluorescence (termed ‘one pole’) was measured in 94% of fluorescing wild‐type cells (Fig.

3 and Table 1). Diphenylamine (DPA), a known inhibitor of polyene and isoprene biosynthesis, is shown to inhibit flash-activatable electron transfer in photosynthetic membranes of Rhodobacter capsulatus.

DPA is specific to the QO site of ubihydroquinone:cytochrome c oxidoreductase, where it inhibits not only reduction of the [2Fe-2S]2+ cluster in the FeS subunit and subsequent cytochrome c.

Protein Conformational Gate Controlling Binding Site Preference and Migration for Ubiquinone-B in the Photosynthetic Reaction Center of Rhodobacter sphaeroides.

The Journal of Physical Chemistry B(11), Rhodobacter sphaeroides has a complex chemosensory system, with several loci encoding multiple homologues of the components required for chemosensing in Escherichia coli.

The operons cheOp2 and cheOp3 each encode complete pathways, and both are essential for components of cheOp2 are predominantly localized to the cell pole. The Rhodobacter sphaeroides response regulator PrrA directly activates transcription of genes necessary for energy conservation at low O 2 tensions and under anaerobic conditions.

It is proposed that PrrA homologues contain a C-terminal DNA-binding domain (PrrA-CTD) that lacks significant amino acid sequence similarity to those found in other response regulators. in order to elucidate the chemosensory pathways of Rhodobacter sphaeroides.

We begin by identifying the main weaknesses of previous modelling efforts before using simplified models to further understand key system features. This leads to the proposal of a new mathematical model. Previously we introduced peptidiscs as an alternative to detergents to stabilize membrane proteins in solution (Carlson et al., ).

Here, we present ‘on-gradient’ reconstitution, a new gentle approach for the reconstitution of labile membrane-protein complexes, and used it to reconstitute Rhodobacter sphaeroides reaction center complexes.

Three separate proteins, BchD, BchH, and BchI, together with ATP, insert magnesium into protoporphyrin IX. An analysis of ATP utilization by the subunits revealed the following: BchH catalyzed ATP hydrolysis at the rate of nmol per min per mg of protein.

BchI and BchD, tested individually, had no ATPase activity but, when combined, hydrolyzed ATP at the rate of. Here, using model oxidized proteins and peptides, enzymatic and mass spectrometry approaches, we showed that the Rhodobacter sphaeroides periplasmic DorA-type DMSO reductase reduces protein bound MetO as efficiently as the free amino acid L-MetO and with catalytic values in the range of those described for the canonical Msrs.

The identification. Phosphorylation-based signaling pathways employ dephosphorylation mechanisms for signal termination. Histidine to aspartate phosphosignaling in the two-component system that controls bacterial chemotaxis has been studied extensively. Rhodobacter sphaeroides has a complex chemosensory pathway with multiple homologues of the.

Title: A Novel Rhodobacter sphaeroides Expression System for Real-Time Evaluation of Heterologous Protein Expression Levels VOLUME: 18 ISSUE: 6 Author(s):Zhiping Zhao, Zongli Hu, Xin Nie, Lijing Cheng, Guolin Ding, Min Luo, Yu Pan, Yan Liang and Guoping Chen Affiliation:Bioengineering College, Chongqing University, Campus A, Shapingba Main.

The six copies of the response regulator CheY from Rhodobacter sphaeroides bind to the switch protein FliM. Phosphorylation by acetyl phosphate (AcP) was detected by tryptophan fluorescence quenching in three of the four CheYs that contain this residue.

Autophosphorylation with Ac32P was observed in five CheY proteins. We also show that all of the cheY genes are .Rhodobacter sphaeroides has two chemotaxis clusters, an Escherichia coli-like cluster with membrane-spanning chemoreceptors and a less-understood cytoplasmic cytoplasmic CheA is split into CheA 4, a kinase, and CheA 3, a His-domain phosphorylated by CheA 4 and a phosphatase domain, which together phosphorylate and dephosphorylate motor-stopping .in the photosynthetic alpha-proteobacterium R.

sphaeroides. Results The Irr Protein of R. sphaeroides does not Influence Growth Under Iron Limitation but Resistance to Oxidative Stress Exponential phase cultures of the R.

sphaeroides wild type and the Dirr deletion strain were subjected to iron limitation as described previously [12].