Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine
Protein engineering and cofactor replacement have been employed as tools to introduce/modulate peroxidase activity in sperm whale Mb (myoglobin). Based on the rationale that haem peroxidase active sites are characterized by specific charged residues, the Mb haem crevice has been modified to host a h...
Published in: | Biochemical Journal |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Portland Press Ltd.
2004
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1042/bj20030863 https://portlandpress.com/biochemj/article-pdf/377/3/717/712876/bj3770717.pdf |
id |
crportlandpress:10.1042/bj20030863 |
---|---|
record_format |
openpolar |
spelling |
crportlandpress:10.1042/bj20030863 2024-06-23T07:56:59+00:00 Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine RONCONE, Raffaella MONZANI, Enrico MURTAS, Monica BATTAINI, Giuseppe PENNATI, Andrea SANANGELANTONI, Anna Maria ZUCCOTTI, Simone BOLOGNESI, Martino CASELLA, Luigi 2004 http://dx.doi.org/10.1042/bj20030863 https://portlandpress.com/biochemj/article-pdf/377/3/717/712876/bj3770717.pdf en eng Portland Press Ltd. Biochemical Journal volume 377, issue 3, page 717-724 ISSN 0264-6021 1470-8728 journal-article 2004 crportlandpress https://doi.org/10.1042/bj20030863 2024-06-06T04:18:27Z Protein engineering and cofactor replacement have been employed as tools to introduce/modulate peroxidase activity in sperm whale Mb (myoglobin). Based on the rationale that haem peroxidase active sites are characterized by specific charged residues, the Mb haem crevice has been modified to host a haem-distalpropionate Arg residue and a proximal Asp, yielding the T67R/S92D Mb mutant. To code extra conformational mobility around the haem, and to increase the peroxidase catalytic efficiency, the T67R/S92D Mb mutant has been subsequently reconstituted with protohaem-l-histidine methyl ester, yielding a stable derivative, T67R/S92D Mb-H. The crystal structure of T67R/S92D cyano-metMb (1.4 Å resolution; R factor, 0.12) highlights a regular haem-cyanide binding mode, and the role for the mutated residues in affecting the haem propionates as well as the neighbouring water structure. The conformational disorder of the haem propionate-7 is evidenced by the NMR spectrum of the mutant. Ligand-binding studies show that the iron(III) centres of T67R/S92D Mb, and especially of T67R/S92D Mb-H, exhibit higher affinity for azide and imidazole than wild-type Mb. In addition, both protein derivatives react faster than wild-type Mb with hydrogen peroxide, showing higher peroxidase-like activity towards phenolic substrates. The catalytic efficiency of T67R/S92D Mb-H in these reactions is the highest so far reported for Mb derivatives. A model for the protein–substrate interaction is deduced based on the crystal structure and on the NMR spectra of protein–phenol complexes. Article in Journal/Newspaper Sperm whale Portland Press Biochemical Journal 377 3 717 724 |
institution |
Open Polar |
collection |
Portland Press |
op_collection_id |
crportlandpress |
language |
English |
description |
Protein engineering and cofactor replacement have been employed as tools to introduce/modulate peroxidase activity in sperm whale Mb (myoglobin). Based on the rationale that haem peroxidase active sites are characterized by specific charged residues, the Mb haem crevice has been modified to host a haem-distalpropionate Arg residue and a proximal Asp, yielding the T67R/S92D Mb mutant. To code extra conformational mobility around the haem, and to increase the peroxidase catalytic efficiency, the T67R/S92D Mb mutant has been subsequently reconstituted with protohaem-l-histidine methyl ester, yielding a stable derivative, T67R/S92D Mb-H. The crystal structure of T67R/S92D cyano-metMb (1.4 Å resolution; R factor, 0.12) highlights a regular haem-cyanide binding mode, and the role for the mutated residues in affecting the haem propionates as well as the neighbouring water structure. The conformational disorder of the haem propionate-7 is evidenced by the NMR spectrum of the mutant. Ligand-binding studies show that the iron(III) centres of T67R/S92D Mb, and especially of T67R/S92D Mb-H, exhibit higher affinity for azide and imidazole than wild-type Mb. In addition, both protein derivatives react faster than wild-type Mb with hydrogen peroxide, showing higher peroxidase-like activity towards phenolic substrates. The catalytic efficiency of T67R/S92D Mb-H in these reactions is the highest so far reported for Mb derivatives. A model for the protein–substrate interaction is deduced based on the crystal structure and on the NMR spectra of protein–phenol complexes. |
format |
Article in Journal/Newspaper |
author |
RONCONE, Raffaella MONZANI, Enrico MURTAS, Monica BATTAINI, Giuseppe PENNATI, Andrea SANANGELANTONI, Anna Maria ZUCCOTTI, Simone BOLOGNESI, Martino CASELLA, Luigi |
spellingShingle |
RONCONE, Raffaella MONZANI, Enrico MURTAS, Monica BATTAINI, Giuseppe PENNATI, Andrea SANANGELANTONI, Anna Maria ZUCCOTTI, Simone BOLOGNESI, Martino CASELLA, Luigi Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine |
author_facet |
RONCONE, Raffaella MONZANI, Enrico MURTAS, Monica BATTAINI, Giuseppe PENNATI, Andrea SANANGELANTONI, Anna Maria ZUCCOTTI, Simone BOLOGNESI, Martino CASELLA, Luigi |
author_sort |
RONCONE, Raffaella |
title |
Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine |
title_short |
Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine |
title_full |
Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine |
title_fullStr |
Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine |
title_full_unstemmed |
Engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the T67R/S92D mutant and its derivative reconstituted with protohaemin-l-histidine |
title_sort |
engineering peroxidase activity in myoglobin: the haem cavity structure and peroxide activation in the t67r/s92d mutant and its derivative reconstituted with protohaemin-l-histidine |
publisher |
Portland Press Ltd. |
publishDate |
2004 |
url |
http://dx.doi.org/10.1042/bj20030863 https://portlandpress.com/biochemj/article-pdf/377/3/717/712876/bj3770717.pdf |
genre |
Sperm whale |
genre_facet |
Sperm whale |
op_source |
Biochemical Journal volume 377, issue 3, page 717-724 ISSN 0264-6021 1470-8728 |
op_doi |
https://doi.org/10.1042/bj20030863 |
container_title |
Biochemical Journal |
container_volume |
377 |
container_issue |
3 |
container_start_page |
717 |
op_container_end_page |
724 |
_version_ |
1802650397757669376 |