Identification of the amino acid residues that change the substrate specificity of PHA synthase 1 from Pseudomonas putida GPo1
碩士 === 國立臺灣大學 === 農業化學研究所 === 92 === In our previously study, the substrate specificity of polyhydroxyalkanoate (PHA) synthase 1 (class II) from Pseudomonas putida GPo1 was successfully altered by localized semi-random mutagenesis. The evolved enzyme PS-E1, in which 14 amino acids had been changed e...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Others |
Language: | zh-TW |
Published: |
2004
|
Online Access: | http://ndltd.ncl.edu.tw/handle/05311529025531561421 |
id |
ndltd-TW-092NTU05406003 |
---|---|
record_format |
oai_dc |
spelling |
ndltd-TW-092NTU054060032016-06-10T04:15:56Z http://ndltd.ncl.edu.tw/handle/05311529025531561421 Identification of the amino acid residues that change the substrate specificity of PHA synthase 1 from Pseudomonas putida GPo1 PseudomonasputidaGPo1聚羥基烷酸酯合成酶中可改變基質專一性的胺基酸位置之研究 Pei-Chien Tsai 蔡佩倩 碩士 國立臺灣大學 農業化學研究所 92 In our previously study, the substrate specificity of polyhydroxyalkanoate (PHA) synthase 1 (class II) from Pseudomonas putida GPo1 was successfully altered by localized semi-random mutagenesis. The evolved enzyme PS-E1, in which 14 amino acids had been changed exhibited broad substrate specificity. The promising amino acid positions which change the substrate specificity of PhaC1Pp were investigated by site directed mutagenesis. Mutations at L484V or S325C were remarkably enhanced the short-chain-length monomer composition up to 40 mol% in PHA accumulation experiment. Simultaneously mutated at S325C and Q481M of PhaC1Pp lead to scl monomer composition further enhanced up to 50 mol%. Furthermore, mutations at S482G, Q481M and A547V would increase PHA yields from 10 mol﹪(wild type ) to 20%, 35%, and 37%, respectively. Saturation mutagenesis experiment will be applied to further acquiring more information about the substrate specificity on PHA synthase 1. Chia-Yin Lee 李佳音 2004 學位論文 ; thesis 64 zh-TW |
collection |
NDLTD |
language |
zh-TW |
format |
Others
|
sources |
NDLTD |
description |
碩士 === 國立臺灣大學 === 農業化學研究所 === 92 === In our previously study, the substrate specificity of polyhydroxyalkanoate (PHA) synthase 1 (class II) from Pseudomonas putida GPo1 was successfully altered by localized semi-random mutagenesis. The evolved enzyme PS-E1, in which 14 amino acids had been changed exhibited broad substrate specificity. The promising amino acid positions which change the substrate specificity of PhaC1Pp were investigated by site directed mutagenesis. Mutations at L484V or S325C were remarkably enhanced the short-chain-length monomer composition up to 40 mol% in PHA accumulation experiment. Simultaneously mutated at S325C and Q481M of PhaC1Pp lead to scl monomer composition further enhanced up to 50 mol%. Furthermore, mutations at S482G, Q481M and A547V would increase PHA yields from 10 mol﹪(wild type ) to 20%, 35%, and 37%, respectively. Saturation mutagenesis experiment will be applied to further acquiring more information about the substrate specificity on PHA synthase 1.
|
author2 |
Chia-Yin Lee |
author_facet |
Chia-Yin Lee Pei-Chien Tsai 蔡佩倩 |
author |
Pei-Chien Tsai 蔡佩倩 |
spellingShingle |
Pei-Chien Tsai 蔡佩倩 Identification of the amino acid residues that change the substrate specificity of PHA synthase 1 from Pseudomonas putida GPo1 |
author_sort |
Pei-Chien Tsai |
title |
Identification of the amino acid residues that change the substrate specificity of PHA synthase 1 from Pseudomonas putida GPo1 |
title_short |
Identification of the amino acid residues that change the substrate specificity of PHA synthase 1 from Pseudomonas putida GPo1 |
title_full |
Identification of the amino acid residues that change the substrate specificity of PHA synthase 1 from Pseudomonas putida GPo1 |
title_fullStr |
Identification of the amino acid residues that change the substrate specificity of PHA synthase 1 from Pseudomonas putida GPo1 |
title_full_unstemmed |
Identification of the amino acid residues that change the substrate specificity of PHA synthase 1 from Pseudomonas putida GPo1 |
title_sort |
identification of the amino acid residues that change the substrate specificity of pha synthase 1 from pseudomonas putida gpo1 |
publishDate |
2004 |
url |
http://ndltd.ncl.edu.tw/handle/05311529025531561421 |
work_keys_str_mv |
AT peichientsai identificationoftheaminoacidresiduesthatchangethesubstratespecificityofphasynthase1frompseudomonasputidagpo1 AT càipèiqiàn identificationoftheaminoacidresiduesthatchangethesubstratespecificityofphasynthase1frompseudomonasputidagpo1 AT peichientsai pseudomonasputidagpo1jùqiǎngjīwánsuānzhǐhéchéngméizhōngkěgǎibiànjīzhìzhuānyīxìngdeànjīsuānwèizhìzhīyánjiū AT càipèiqiàn pseudomonasputidagpo1jùqiǎngjīwánsuānzhǐhéchéngméizhōngkěgǎibiànjīzhìzhuānyīxìngdeànjīsuānwèizhìzhīyánjiū |
_version_ |
1718300781727186944 |