Use of Protein Trans-splicing to Produce Active and Segmentally (2)H, (15)N Labeled Mannuronan C5-epimerase AlgE4

Overview

Journal Protein Sci

Specialty Biochemistry

Date 2010 Jun 17

PMID 20552686

Citations 7

Authors

Edith Buchinger

Finn L Aachmann

A Sesilja Aranko

Svein Valla

Gudmund Skjak-Braek

Hideo Iwai

Reinhard Wimmer

Affiliations

Soon will be listed here.

Abstract

Alginate epimerases are large multidomain proteins capable of epimerising C5 on beta-D-mannuronic acid (M) turning it into alpha-L-guluronic acid (G) in a polymeric alginate. Azotobacter vinelandii secretes a family of seven epimerases, each of which is capable of producing alginates with characteristic G distribution patterns. All seven epimerases consist of two types of modules, denoted A and R, in varying numbers. Attempts to study these enzymes with solution-state NMR are hampered by their size-the smallest epimerase, AlgE4, consisting of one A- and one R-module, is 58 kDa, resulting in heavy signal overlap impairing the interpretation of NMR spectra. Thus we obtained segmentally (2)H, (15)N labeled AlgE4 isotopomeres (A-[(2)H, (15)N]-R and [(2)H, (15)N]-A-R) by protein trans-splicing using the naturally split intein of Nostoc punctiforme. The NMR spectra of native AlgE4 and the ligated versions coincide well proving the conservation of protein structure. The activity of the ligated AlgE4 was verified by two different enzyme activity assays, demonstrating that ligated AlgE4 displays the same catalytic activity as wild-type AlgE4.

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