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Crystal structure and enzymatic characterization of the putative adenylyl cyclase HpAC1 from Hippeastrum reveal dominant triphosphatase activity

Title data

Kleinboelting, Silke ; Miehling, Jonas ; Steegborn, Clemens:
Crystal structure and enzymatic characterization of the putative adenylyl cyclase HpAC1 from Hippeastrum reveal dominant triphosphatase activity.
In: Journal of Structural Biology. Vol. 212 (December 2020) Issue 3 . - No. 107649.
ISSN 1047-8477
DOI: https://doi.org/10.1016/j.jsb.2020.107649

Abstract in another language

HpAC1, a protein from Hippeastrum hybrid cultivars, was previously suggested to be a plant adenylyl cyclase. We describe a structural and enzymatic characterization of HpAC1. A crystal structure of HpAC1 in complex with a non-hydrolyzable GTP analog confirms a generic CYTH architecture, comprising a β-barrel with an internal substrate site. The structure reveals significant active site differences to AC proteins with CYTH fold, however, and we find that HpAC1 lacks measurable AC activity. Instead, HpAC1 has substantial triphosphatase activity, indicating this protective activity or a related activity as the protein's physiological function.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: GTP analog; PPPase; Plant; Substrate complex; Substrate specificity
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Biochemistry > Chair Biochemistry - Univ.-Prof. Dr. Clemens Steegborn
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
500 Science > 570 Life sciences, biology
Date Deposited: 25 Jan 2021 12:44
Last Modified: 25 Jan 2021 12:44
URI: https://eref.uni-bayreuth.de/id/eprint/62333