Disclosed are various forms of an active, isolated .beta.-secretase enzyme in purified and recombinant form. This enzyme is implicated in the production of amyloid plaque components which accumulate in the brains of individuals afflicted with Alzheimer's disease. Recombinant cells that produce this enzyme either alone or in combination with some of its natural substrates (.beta.-APPwt and .beta.-APPsw) are also disclosed, as are antibodies directed to such proteins. These compositions are useful for use in methods of selecting compounds that modulate .beta.-secretase. Inhibitors of .beta.-secretase are implicated as therapeutics in the treatment of neurodegenerative diseases, such as Alzheimer's disease.

Se divulgan las varias formas de una enzima activa, aislada del beta.-secretase en forma purificada y recombinant. Esta enzima está implicada en la producción de los componentes amiloideos de la placa que acumulan en los cerebros de los individuos afligidos con la enfermedad de Alzheimer. Células recombinant que producen esta enzima o solamente o conjuntamente con algunos de sus substratos naturales (beta.-APPwt y beta.-APPsw) también se divulgan, al igual que anticuerpos dirigidos a tales proteínas. Estas composiciones son útiles para el uso en métodos de seleccionar los compuestos que modulan el beta.-secretase. Los inhibidores del beta.-secretase están implicados como terapéutica en el tratamiento de enfermedades neurodegenerative, tales como enfermedad de Alzheimer.

 
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