Search
Active Site Architecture and Reaction Mechanism Determination of Cold Adapted beta-D-galactosidase from Arthrobacter sp. 32cB
Abstract
ArthbetaDG is a dimeric, cold-adapted beta-D-galactosidase that exhibits high hydrolytic and transglycosylation activity. A series of crystal structures of its wild form, as well as its ArthbetaDG_E441Q mutein complexes with ligands were obtained in order to describe the mode of its action. The ArthbetaDG_E441Q mutein is an inactive form of the enzyme designed to enable observation of enzyme interaction with its substrate. The resulting three-dimensional structures of complexes: ArthbetaDG_E441Q/LACs and ArthbetaDG/IPTG (ligand bound in shallow mode) and structures of complexes ArthbetaDG_E441Q/LACd, ArthbetaDG/ONPG (ligands bound in deep mode), and galactose ArthbetaDG/GAL and their analysis enabled structural characterization of the hydrolysis reaction mechanism. Furthermore, comparative analysis with mesophilic analogs revealed the most striking differences in catalysis mechanisms. The key role in substrate transfer from shallow to deep binding mode involves rotation of the F581 side chain. It is worth noting that the 10-aa loop restricting access to the active site in mesophilic GH2 betaDGs, in ArthbetaDG is moved outward. This facilitates access of substrate to active site. Such a permanent exposure of the entrance to the active site may be a key factor for improved turnover rate of the cold adapted enzyme and thus a structural feature related to its cold adaptation.
Citations
-
7
CrossRef
-
0
Web of Science
-
1 4
Scopus
Authors (5)
-
Maria Rutkiewicz dr inż.
-
Anna Bujacz
-
Anna Wierzbicka-Woś
Cite as
Full text
- Publication version
- Accepted or Published Version
- License
-
open in new tab
Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
no. 20,
pages 1 - 17,
ISSN: 1661-6596 - Language:
- English
- Publication year:
- 2019
- Bibliographic description:
- Rutkiewicz M., Bujacz A., Wanarska M., Wierzbicka-Woś A., Cieśliński H.: Active Site Architecture and Reaction Mechanism Determination of Cold Adapted beta-D-galactosidase from Arthrobacter sp. 32cB// INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES -Vol. 20,iss. 17 (2019), s.1-17
- DOI:
- Digital Object Identifier (open in new tab) 10.3390/ijms20174301
- Verified by:
- Gdańsk University of Technology
Referenced datasets
seen 165 times
Recommended for you
Mapping the Transglycosylation Relevant Sites of Cold-Adapted β-D-Galactosidase from Arthrobacter sp. 32cB
- M. Rutkiewicz,
- M. Wanarska,
- A. Bujacz
Structural studies of a cold-adapted dimeric Beta-D-galactosidase from Paracoccus sp. 32d
- M. Rutkiewicz-krotewicz,
- A. Pietrzyk-Brzezińska,
- B. Sekuła
- + 4 authors
Crystal structures of aminotransferases Aro8 and Aro9 from Candida albicans and structural insights into their properties
- A. Kiliszek,
- W. Rypniewski,
- K. Rząd
- + 2 authors
A novel cold-active beta-D-galactosidase from the Paracoccus sp. 32d - gene cloning, purification and characterization
- A. Wierzbicka-Woś,
- H. Cieśliński,
- M. Wanarska
- + 3 authors