Abbott Laboratories Corporation

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Donald D Johnson

Thomas P Leary

Shelley R Holets-McCormack

Elaine Marie Brate

Rajarathnam E Reddy

Thomas G Spring

Yon-Yih Chen

Ramani S Wonderling

John F Uher

The present invention relates to a new method of producing functionally active recombinant porcine Intrinsic Factor as well as the protein (i.e., porcine Intrinsic Factor) produced thereby. In particular, the vector comprising the DNA encoding the protein is introduced into a Chinese Hamster Ovary (CHO) host cell under conditions sufficient for optimal expression of functional protein. The expressed protein may then be subjected to three methods ultimately resulting in a protein having at least 97% purity.

Cloning, expression and purification of recombinant porcine intrinsic factor for use in diagnostic assay

Methods and kits for measurement of concentration of FK778 in a biological sample by means of an immunoassay, preferably a competitive immunoassay. In one aspect, the method and kit involve the use of (a) an antibody to FK778 conjugated to a label, e.g., an acridinium label, (b) an antibody to FK778 not conjugated to a label, (c) a solid phase containing an antibody to a first hapten, e.g., a fluorescein hapten, and (d) a bihapten comprising a first hapten and FK778 or an analogue of FK778, e.g., a bihapten comprising a fluorescein hapten and a FK778 hapten. In another aspect, the method and kit involve the use of (a) antibody to FK778, (b) a bihapten comprising FK778 or an analogue of FK778 and a first hapten, e.g., a bihapten comprising the fluorescein hapten and the hapten of FK778 or an analogue of FK778, and (c) a pretreatment reagent.

Determination of concentration of FK778 by competitive immunoassay

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Libertyville, IL, United States of America

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