Laboratory of Enzyme Chemistry
(Prof. Asano's Laboratory)

Biotechnology Research Center, Toyama Prefectural University, Japan

Sep 1, 1998 OPENED
Jul 1, 2022 UPDATED!
Member Name E-mail
Professor Yasuhisa ASANO asano@
Associate Professor Makoto HIBI hibi@
Assistant Professor Takuya YAMAGUCHI t-yamaguchi@
Post Doctoral Fellow Suguru SHINODA shinoda@
Post Doctoral Fellow Kunwadee PALASIN palasin@
Post Doctoral Fellow Genji IWASAKI iwasaki@
Post Doctoral Fellow Joy CHAKRABORTY joy@
Post Doctoral Fellow Yukio WATANABE y-watanabe@
Post Doctoral Fellow Wiyada KHANGKHACHIT wiyada@
Researcher Koichi WADA z16056@
Assistant Kaori YAMAGUCHI k-yamaguchi@
Assistant Shuang WANG wang@
Assistant Tomomi KUBOTA tomomi1126@
Assistant Ai KUCHIKI kuchiki@
Research office work Miyako MORIKAWA m-morikawa@
Doctor Course 3rd year Student
Sununta PANYASANG u076002@st.
Doctor Course 2nd year Student
Wu JINGFEI u178001@st.
Master Course 1st year student Sora IKEDA u256002@st.@st.
Master Course 1st year student Rina UKAWA u256007@st.
Exchange student Jariya RUANGWICHA z16077@st.
Exchange student Naruepon LIEWTRAKUL z16076@st.
4th year student Takumi NISHIWAKI t716028@st.
4th year student Ami UOTANI t816007@st.
4th year student Yu IZAWA t816001@st.
4th year student Syunpei IWAO t916005@st.
4th year student Erina SAWA t916018@st.
4th year student Seiya SHIRAI t916022@st.
4th year student Ryo TAMAKI t916025@st.
4th year student Takuya NOMURA t916029@st.

E-mail address: place "" after @, or @st.

He has been Editors of:

Journal of Molecular Catalysis B: Enzymatic (Elsevier),
Bioscience, Biotechnology and Biochemistry (Tokyo),
Journal of Bioscience and Bioengineering (Osaka),
Frontiers of Chemical Engineering in China (Springer),
ChemCatChem (Wiley), and
Industrial Biotechnology (Mary Ann Liebert, Inc.).

He has been awarded:

The Progress Award in Synthetic Organic Chemistry (1990)
The Japan Bioscience, Biotechnology and Agrochemistry Society Award for the Encouragement of Young Scientists (1991)
Toyama Award (1993)
The Chemical Society of Japan Award for Technical Development for 2004 (2005)
The Japan Bioscience, Biotechnology and Agrochemistry Society Award (The Best Award of Japan Society of Bioscience, Biotechnology, and Agrochemistry) (2008)
The Japan Bioindustry Association Award (2008)
A Medal with Purple Ribbon (2011)
ERATO Asano Active Enzyme Molecule Project (2012)
The Toyama Newspaper "Culture Award" (2013)
Enzyme Engineering Award (2013)
Biocat Award – Science 2014(2014)

Research interests of Prof. Asano

Prof. Asano's group in the Biotechnology Research Center of Toyama Prefectural University carries out an extensive screening for novel enzymes catalyzing new reactions, with their deep knowledge in microbiology, biochemistry, enzymology, synthetic organic chemistry, and molecular genetics, etc. They have been pioneers in the exploitation of novel enzymes, as can be seen in Prof. Asano's discovery of nitrile hydratase, which is now utilized in the industrial production of acrylamide, nicotinamide and 5-cyanovaleramide in multi-tons scale, and in the first crystallization and characterization of phenylalanine dehydrogenase followed by its successful use in the mass-screening of phenylketonuria in Japan. Not only the exploring studies, but also intensive basic studies are carried out to understand the enzymological characteristics by the use of synthetic chemicals. The structure of the enzymes are analyzed by the techniques in molecular cloning, nucleotide and protein sequencing. Site-directed mutagenesis of the genes are routinely carried out by random and designed manners.

Highlights of current work include; discovery of novel Phenylalanine dehydrogenases (PheDH) from nature, use of PheDHs in the enantioselective synthesis of natural and unnatural L amino acids; microdetermination of L-Phe in blood samples of neonates utilizing PheDH (1/3 of Japanese babies are tested with the enzyme); characterization, gene cloning, structure elucidation, and X-ray structure determination of a new enzyme opine dehydrogenase as one of the first examples of D-stereospecific amino acid dehydrogenase; discovery of 3-methylaspartate ammonia lyase from facultative anaerobes for chiral synthesis and X-ray structure determination; discovery, characterization, structure determination of D-stereospecific peptidases and D-amidases and uses in the syntheses of D-amino acids and D-amino acid containing peptides; discovery and characterization of transphosphorylase producing inosine 5'-phosphate, evolutionary mutagenesis of the enzyme for industrial application (3000 or more tons/year by Ajinomoto Co. from 2003) and X-ray structure determination, and occurrence of aldoxime dehydratase in nitrile degraders, etc.

An amino acid amide racemase activity was discovered in a-amino-e-caprolactam racemase and the dynamic kinetic resolution of amino acid amide with an amino acid amidase was realized. >From 2003, a new project on protein chips using PheDH was started. Since 2003, A “multi enzyme chip” is being developed for enzyme assay system for diagnosis of phenylketonuria (PKU), galactosemia (GAL), maple syrup urine disease (MSUD) and homocystinuria (HCU), in the Toyama Medical Bio-Cluster Project.

They have been collaborating with Prof. Cooper's group of Biochemistry Department at the Weill Medical College of Cornell University, USA. on the use of PheDH. They are also cooperating with Profs. Engel's and Mayhew's groups of Univ. College Dublin, Ireland, to explore roles of some amino acid residues in PheDH and opine dehydrogenase by the site-directed mutagenesis, and the structural analyses by X-ray crystallography with Prof. Rice's group of Univ. of Sheffield, U.K. On Aug 1, 2006, a scientific exchange agreement was made in between The Faculty of Agro-Industry, Prince of Songkla University, Thailand, and the Graduate School of Engineering, Toyama Prefectural University. They and Drs. H-Kittikun and Hongpattarakere’s groups in Thai side are promoting activities in collaborative research on the development of resources of useful microorganisms and plants, and exchange of scientists and students.

Their laboratory is the first one opened in the Center in 1992. Three laboratories were opened later in 1995, and the expansion of the Center was completed in 1996, when they started enrolling graduate students. Although they have 15 years of history in the Center, some of the projects were started in the Sagami Chemical Research Center, Kanagawa, Japan in 1984. Their laboratory currently consists of 1 Professor, 1 Lecturer, 1 Assistant Professor, 1 postdoctoral fellow, 1 postmaster fellow, 1 special researcher from a company, 4 technicians, 4 postgraduate research students, and 1 undergraduate student. Financial supports have been provided by the Government of Toyama Prefecture, the Ministry of Education of Japan, Japan Society for the Promotion of Sciences, and various private scientific foundations in Japan.



1.1 A new enzymatic method of selective phosphorylation of nucleosides, optimization of the enzymatic reaction by directed evolution, and its industrial use

1.2 Development of chip technology to determine blood L-phenylalanine and other amino acids

1.3 Screening for new hydroxynitrile lyases of plant origin and thier application to stereoselective cyanohydrin synthesis, and thier gene expression in heterologous hosts

1.4 Discovery of amino acid amide racemase and its use in the dynamic kinetic resolution of amino acid amides


2.1 Phenylalanine dehydrogenase (EC from Sporosarcina ureae, Bacillus sphaericus, Bacillus badius, Micrococcus sp.
L-Phenylalanine determination in the blood of neonates
Synthesis L-amino acids from their keto analogs.

2.2 Opine dehydrogenase from Arthrobacter sp.
Synthesis of secondary amine dicaroboxylic acids
X-ray crystallography and reaction mechanism (with Prof. D. Rice)


3.1 D-Malate hydro-lyase
Synthesis of D-malate from maleate
Synthesis of citramalate from itaconate

3.2 3-Methylaspartate ammonia-lyase
Discovery in Enterobacteria
Synthesis of aspartate analogs from fumarate
X-ray crystallography (with Prof. D. Rice)


4.1 D-Aminopeptidase (EC from Ochrobactrum anthropi
Synthesis of D-alanine N-Alkylamides and D-Ala oligomers
Similarity of the primary structure with b-lactamases and PBP
4.2 Alkaline D-peptidase (a new enzyme)

Synthesis of D-Phe oligomers
Similarity of the primary structure with b-lactamases and PBP

4.3 D-Amino acid amidase

4.4 Microbial degradation of (D-Glu)8 and (D-Asp)8


Nitrile hydratase (a lyase)
Aldoxime dehydratase (a new lyase)



Stereospecific cis-1,2-indandiol oxidation to yield (R)-2-hydroxy-1-indanone
New epoxide hydrolases

Professor Yasuhisa Asano
Biotechnology Research Center and Department of Biotechnology; JST, ERATO
Toyama Prefectural University
5180 Kurokawa, Imizu,
Toyama 939-0398 JAPAN
Tel: +81-766-56-7500 ext 530; Fax: +81-766-56-2498
Mail to: asano@

E-mail address: place "" after @