Expression and Purification of Soluble, Active Heterodimeric Guanylyl Cyclase from Baculovirus

Authors: Gupta G.; Kim J.; Yang L.; Sturley S.L.; Danziger R.S.

Source: Protein Expression and Purification, Volume 10, Number 3, August 1997 , pp. 325-330(6)

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Abstract:

A method for expression and purification of active cytosolic heterodimeric histidine (His)-tagged guanylyl cyclase of the alpha1/beta1 isoform has been developed using recombinant baculovirus-transfected insect cells. Confirmation of expression of active cyclase was obtained by both Western analysis and enzymatic activity. A His tag on the COOH-terminus of the alpha1 and beta1 subunits allowed rapid purification of the heterodimeric form of guanylyl cyclase in a single affinity step using a nickel column. A second gel-filtration step was applied to reconstitute into the complex heme, a required cofactor. This was confirmed spectroscopically by absorbance in the Soret region. Like enzyme purified from tissue, the activity of recombinant guanylyl cyclase was increased by protoporphyrin IX and inhibited by both Zn- and Sn-protoporphyrin. The method described here should provide a general approach for the expression and purification of alternate forms of cytosolic guanylyl cyclase and facilitate mechanistic and structural studies of this important family of enzymes. Furthermore, the procedure demonstrates the utility of the His-tag system to purify multimeric proteins.

Language: English

Document Type: Research article

Affiliations: College of Physicians & Surgeons, Columbia University, 630 West 168th Street, New York, New York, 10032

Publication date: 1997-08-01