Methods and compositions for assaying analytes

C - Chemistry – Metallurgy – 12 – N

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C12N 15/62 (2006.01) C07K 19/00 (2006.01) C12N 9/24 (2006.01) C12N 15/56 (2006.01) C12Q 1/25 (2006.01) C12Q 1/34 (2006.01) G01N 33/573 (2006.01) G01N 33/84 (2006.01)

Patent

CA 2377665

Compositions and methods for assaying analytes, preferably, small molecule analytes are provided. Assay methods employ, in place of antibodies or molecules that bind to target analytes or substrates, modified enzymes, called substrate trapping enzymes. These modified enzymes retain binding affinity or have enhanced binding affinity for a target substrate or analyte, but have attenuated catalytic activity with respect to that substrate or analyte. The modified enzymes are provided. In particular, mutant S-adenosylhomocysteine (SAH) hydrolases, substantially retaining binding affinity or having enhanced binding affinity for homocysteine or S-adenosylhomocysteine but having attenuated catalytic activity, are provided. Conjugates of the modified enzymes and a facilitating agent, such as agents that aid in purification or linkage to a solid support are also provided.

L'invention concerne des compositions et des méthodes permettant d'analyser des analytes, de préférence, des analytes à petites molécules. Ces méthodes d'analyse utilisent, au lieu d'anticorps ou de molécules qui se lient aux analytes ou aux substrats cibles, des enzymes modifiées, appelées enzymes de piégeage par substrat. Ces enzymes modifiées retiennent une affinité de liaison ou présentent une affinité de liaison améliorée pour un substrat ou un analyte cible, mais elles présentent une activité catalytique atténuée par rapport au substrat ou à l'analyte. L'invention concerne également ces enzymes modifiées, et notamment, des S-adénosylhomocystéine (SAH) hydrolases mutantes, retenant sensiblement une affinité de liaison ou présentant une affinité de liaison améliorée pour l'homocystéine ou la S-adénosylhomocystéine, mais présentant une activité catalytique atténuée. L'invention concerne en outre des conjugués des enzymes modifiées et une substance auxiliaire, tel que des agents assistant à la purification ou à la liaison sur un support solide.

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