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1.
Phenylnaphthalene compounds from the subterranean part of Vitex rotundifolia and their antibacterial activity against methicillin-resistant Staphylococcus aureus.
Kawazoe, K; Yutani, A; Tamemoto, K; Yuasa, S; Shibata, H; Higuti, T; Takaishi, Y.
J Nat Prod ; 64(5): 588-91, 2001 May.
Article in English | MEDLINE | ID: mdl-11374949

ABSTRACT

A careful investigation of the subterranean part of Vitex rotundifolia has shown that this plant contains five novel lignans having a 1-phenylnaphthalene-type skeleton together with four known lignans. These structures were elucidated on the basis of spectroscopic data. Furthermore, some of the isolated compounds showed antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA).


Subject(s)
Anti-Bacterial Agents/isolation & purification , Methicillin Resistance , Naphthalenes/isolation & purification , Naphthalenes/pharmacology , Plants, Medicinal/chemistry , Staphylococcus aureus/drug effects , Anti-Bacterial Agents/pharmacology , Asia , Mass Spectrometry , Microbial Sensitivity Tests , Plant Roots/chemistry , Spectrophotometry, Infrared , Spectrophotometry, Ultraviolet
2.
The study of renaturation process of reduced taka-amylase A: dependence of rate of renaturation on protein concentration.
Yutani, K; Yutani, A; Isemura, T.
J Biochem ; 66(6): 823-9, 1969 Dec.
Article in English | MEDLINE | ID: mdl-5366995

Subject(s)
Amylases/metabolism , Protein Denaturation , Proteins/metabolism , Calcium/pharmacology , Cystine/pharmacology , Enzyme Activation , Hydrogen-Ion Concentration , Kinetics , Oxidation-Reduction , Spectrophotometry , Spectrum Analysis , Time Factors , Ultraviolet Rays
3.
Stability of the conformation of saccharifying bacterial alpha-amylase.
Yutani, A; Yutani, K; Isemura, T.
J Biochem ; 65(2): 201-8, 1969 Feb.
Article in English | MEDLINE | ID: mdl-5771951

Subject(s)
Amylases , Amylases/analysis , Calcium/pharmacology , Chemical Phenomena , Chemistry, Physical , Light , Molecular Weight , Optical Rotatory Dispersion , Spectrophotometry , Tryptophan/analysis , Tyrosine/analysis , Ultracentrifugation , Ultraviolet Rays , Viscosity
4.
The mechanism of refording of the reduced random coil form of lysozyme.
Yutani, K; Yutani, A; Imanishi, A; Isemura, T.
J Biochem ; 64(4): 449-55, 1968 Oct.
Article in English | MEDLINE | ID: mdl-5707833

Subject(s)
Muramidase/metabolism , Chemical Phenomena , Chemistry, Physical , Egg White , Optical Rotatory Dispersion , Oxidation-Reduction , Spectrophotometry , Sulfhydryl Compounds
5.
The reoxidation of reduced ribonuclease to the native conformation as determined by circular dichroism.
Isemura, T; Yutani, K; Yutani, A; Imanishi, A.
J Biochem ; 64(3): 411-3, 1968 Sep.
Article in English | MEDLINE | ID: mdl-5707828

Subject(s)
Oxidation-Reduction , Ribonucleases , Chemical Phenomena , Chemistry, Physical , Mercaptoethanol
6.
Accelerating effect of proteins on the renaturation of denatured bacterial alpha-amylase.
Yutani, K; Yutani, A; Isemura, T.
J Biochem ; 62(5): 576-83, 1967 Nov.
Article in English | MEDLINE | ID: mdl-4172381

Subject(s)
Amylases , Bacteria/enzymology , Proteins , Urea , Amino Acids , Calcium , Caseins , Chemical Phenomena , Chemistry , Hydrogen-Ion Concentration , Muramidase , Serum Albumin, Bovine , Spectrum Analysis , Temperature , Ultraviolet Rays , gamma-Globulins
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