United States Patent 19 11 Patent Number: 5,780,253 Subramanian Et Al
III USOO5780253A United States Patent 19 11 Patent Number: 5,780,253 Subramanian et al. (45) Date of Patent: Jul. 14, 1998 54 SCREENING METHOD FOR DETECTION OF 4.433.999 2/1984 Hyzak ....................................... 71.03 HERBCDES 4.6–552 2/1987 Anoti et al. if O3. 4,802,912 2/1989 Baker ........................................ 7/103 Inventors: Wenkiteswaran Subramanian Danville: Anne G. Toschi. Burlingame. OTHERTHER PPUBLICATION CATIONS both of Calif. Heim et al. Pesticide Biochem & Physiol; vol. 53, pp. 138-145 (1995). 73) Assignee: Sandoz Ltd., Basel. Switzerland Hatch. MD.: Phytochem. vol. 6... pp. 115 to 119, (1967). Haworth et al. J. Agric. Food Chem, vol. 38, pp. 1271-1273. 21 Appl. No.:752.990 1990. Nishimura et al: Phytochem: vol. 34, pp. 613-615. (1993). 22 Filed: Nov. 21, 1996 Primary Examiner-Louise N. Leary Related U.S. Application Data Attorney, Agent, or Firm-Lynn Marcus-Wyner: Michael P. Morris 63 Continuation of Ser. No. 434.826, May 4, 1995, abandoned. 6 57 ABSTRACT 51 Int. Cl. ............................... C12Q 1/48: C12Q 1/32: C12Q 1/37; C12O 1/00 This invention relates to novel screening methods for iden 52 U.S. Cl. ................................. 435/15:435/18: 435/26: tifying compounds that specifically inhibit a biosynthetic 435/23: 435/4, 536/23.6:536/23.2:536/24.3 pathway in plants. Enzymes which are specifically affected 536/26.11:536/26.12:536/26.13 by the novel screening method include plant purine biosyn 58 Field of Search .................................. 435/15, 8, 26, thetic pathway enzymes and particularly the enzymes 435/23 4: 536/23.6, 23.2, 24.3, 26.1, involved in the conversion of inosine monophosphate to 26.12, 26.13 adenosine monophosphate and inosine monophosphate to guanosine monophosphate.
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