guanidine/עששת

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V67L Mutation Fills an Internal Cavity To Stabilize RecA Mtu Intein.

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התחבר הרשם

Inteins mediate protein splicing, which has found extensive applications in protein science and biotechnology. In the Mycobacterium tuberculosis RecA mini-mini intein (ΔΔIhh), a single valine to leucine substitution at position 67 (V67L) dramatically increases intein stability and activity. However,

Polymethylene-co-guanidine based capsules: a mechanistic study of the formation using alginate and cellulose sulphate.

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התחבר הרשם

Capsules have been prepared based on a polyanion blend of sodium alginate and sodium cellulose sulphate, gelled in the presence of calcium chloride and sodium chloride. In a second step a membrane was formed via the addition of polymethylene-co-guanidine (PMCG), an oligocation. A mechanistic study

The Guanidine Pseudoalkaloids 10-Methoxy-Leonurine and Leonurine Act as Competitive Inhibitors of Tyrosinase.

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התחבר הרשם

: Tyrosinase plays a key role in the production of melanin. A variety of industrial fields have shown interest in the development of tyrosinase inhibitors from plants. In this study, compounds 1-5 derived from Leonurusjaponicas were evaluated to determine their

Unusual oxidative chemistry of N(omega)-hydroxyarginine and N-hydroxyguanidine catalyzed at an engineered cavity in a heme peroxidase.

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התחבר הרשם

Heme enzymes are capable of catalyzing a range of oxidative chemistry with high specificity, depending on the surrounding protein environment. We describe here a reaction catalyzed by a mutant of cytochrome c peroxidase, which is similar but distinct from those catalyzed by nitric-oxide synthase. In

Effect of guanidine hydrochloride and urea on the interaction of 6-thioguanine with human serum albumin: a spectroscopic and molecular dynamics based study.

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התחבר הרשם

6-thioguanine (6-TG) is an antineoplastic, nucleobase guanine, purine analog drug belongs to thiopurine drug-family of antimetabolites. In the present study, we report an experimental approach towards interaction mechanism of 6-TG with human serum albumin (HSA) and examine the chemical stability of

Detection of norepinephrine distribution in rats with adrenal medulla autotransplants using 125I-meta-iodobenzyl guanidine.

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התחבר הרשם

The viability of autologous adrenal medullary transplants was evaluated using 125I-meta-iodobenzyl guanidine (MIBG), an adrenal medullary scanning agent. Bilateral cavities in the caudate nuclei were made stereotaxically in Wistar rats. One week later, the left adrenal medulla was resected by

N-Substituted N'-(2-alkylthio-4-chloro-5-methylbenzenesulfonyl)guanidines--Antibacterial, Cytotoxic Activities and Some Structure-Activity Relationships.

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התחבר הרשם

A series of N-substituted N'-(2-alkylthio-4-chloro-5-methylbenzenesulfonyl)guanidine derivatives bearing sulfonamide moiety have been screened in vitro for antibacterial activity against isolates from patients with infections of oral cavity, respiratory tract and intestinal tract. The majority of

Dynamics of ligand rebinding to unfolded MbCO by guanidine HCl.

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התחבר הרשם

Femtosecond vibrational spectroscopy was used to probe a functionally important dynamics and residual structure of myoglobin unfolded by 4 M guanidine HCl. The spectra of the dissociated CO indicated that the residual structure of unfolded myoglobin (Mb) forms a few hydrophobic cavities that could

Artificial metalloenzymes based on protein cavities: exploring the effect of altering the metal ligand attachment position by site directed mutagenesis.

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התחבר הרשם

In an effort to construct catalysts with enzyme-like properties, we are employing a small, cavity-containing protein as a scaffold for the attachment of catalytic groups. In earlier work we demonstrated that a phenanthroline ligand could be introduced into the cavity of the protein ALBP and used to

Design of functional ferritin-like proteins with hydrophobic cavities.

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התחבר הרשם

Ferritin four-helix bundle subunits self-assemble to create a stable multimer with a large central hydrophilic cavity where metal ions bind. To explore the versatility of this reaction vessel, computational design was used to generate cavities with increasingly apolar surface areas inside a

Effects of local immunization with glucosyltransferase fractions from Streptococcus mutans on dental caries in hamsters caused by homologous and heterologous serotypes of Streptococcus mutans.

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התחבר הרשם

Seven serotypes of Streptococcus mutans have been identified. The biochemical, genetic, and serological characteristics of these serotypes have indicated that certain serotypes are quite similar, whereas others are quite distinct. The effect of local immunization with glucosyltransferase (GTF)

Guanidine derivatives restore activity to carboxypeptidase lacking arginine-127.

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התחבר הרשם

Arg-127 stabilizes the oxyanion of the tetrahedral intermediate formed during Zn2+ carboxypeptidase A-catalyzed hydrolysis. Mutant carboxypeptidases lacking Arg-127 exhibit substantially reduced rates of hydrolysis with the change manifest almost entirely in kcat (kcat/Km is decreased by 10(4) for

Channel directed rutin nano-encapsulation in phytoferritin induced by guanidine hydrochloride.

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התחבר הרשם

Phytoferritin cage has a nano-sized cavity to encapsulate bioactive molecules. In this work, a novel approach is presented that guanidine hydrochloride (GuHCl) (2mM) can expand the channel of apo-soybean seed ferritin (apoSSF) and promote the encapsulation of rutin molecules in apoSSF at pH 7.0

Structure of the herpes simplex virus capsid: effects of extraction with guanidine hydrochloride and partial reconstitution of extracted capsids.

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התחבר הרשם

Viral B capsids were purified from cells infected with herpes simplex virus type 1 and extracted in vitro with 2.0 M guanidine hydrochloride (GuHCl). Sodium dodecyl sulfate-polyacrylamide gel analyses demonstrated that extraction resulted in the removal of greater than 95% of capsid proteins VP22a

The role of salivary peptides in dental caries.

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התחבר הרשם

Dental caries is a complex disease, characterized by demineralization of tooth structure. With a protective role, several salivary phosphopeptides appear to be involved in remineralization processes, delaying the loss of tooth structure. In this work we have correlated peptide saliva composition

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Herbal & Natural Medicine

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