Gegenstand der vorliegenden Erfindung sind eine Aspartatprotease, Nucleinsäuren kodierend für die Aspartatprotease sowie die damit in Verbindung stehenden Inhibitoren, Antikörper, Arznei- und Diagnostikmittel.The present invention relates to an aspartate protease, nucleic acidscoding for the aspartate protease and the relatedInhibitors, antibodies, medicines and diagnostic agents.
Die vorliegende Erfindung stellt eine Aspartatprotease mit zwei Asparatresten in einer katalytisch aktiven Struktur, wobei ein erster Asparatrest in einem Motiv X1GX2GD liegt und ein zweiter Aspartatrest in einem Motiv X3X4DX5 liegt, wobei X1, X2, X3 und X5 unabhängig voneinander ausgewählt werden aus Ala, ValLeu, Met und Ile und X4 eine aromatische Aminosäure ist, und die Motive X1GX2GD und X3X4DX5 in einer Transmembranregion liegen, zur Verfügung. Für die Motive wurde der Einbuchstabencode der Aminosäuren verwendet, d. h. D = Asp, G = Gly usw.The present invention provides an aspartate protease with two aspartate residues in a catalytically active structure, a first aspartate residue being in a motif X1 GX2 GD and a second aspartate residue being in a motif X3 X4 DX5 , where X1 , X2 , X3 and X5 are independently selected from Ala, ValLeu, Met and Ile and X4 is an aromatic amino acid, and the motifs X1 GX2 GD and X3 X4 DX5 are located in a transmembrane region. The single letter code of the amino acids was used for the motifs, ie D = Asp, G = Gly etc.
Solche Aspartatproteasen sind mit hoher Wahrscheinlichkeit an der Spaltung des Amyloid Precursor Proteins (APP) beteiligt. In einer Ausführungsform der Erfindung stellt die erfindungsgemäße Aspartatprotease die bisher nicht identifizierte γ-Secretase dar, die an der Prozessierung des APP zu den als Aß bezeichneten Amyloidpeptiden beteiligt ist.Such aspartate proteases are very likely to cleave theAmyloid precursor proteins (APP) involved. In one embodiment of the inventionrepresents the aspartate protease according to the invention the previously unidentified γ-secretaserepresents the processing of the APP to the amyloid peptides referred to as Aßis involved.
Ein Überblick über die Rolle der y-Secretasen bei der Entstehung der Alzheimerschen Erkrankung geben S. L. Ross et al. in J. of Biol. Chem. 273 (1998), 15309-15312.An overview of the role of y-secretases in the development of Alzheimer'sDisease give S. L. Ross et al. in J. of Biol. Chem. 273 (1998), 15309-15312.
Bevorzugte Aspartatproteasen der vorliegenden Erfindung weisen zusätzlich eine Sequenz PALX6YX7VP auf, wobei X6 und X7 die gleiche Bedeutung haben wie X1. Es wird jedoch bevorzugt, daß X6 und X7 Leucin oder Isoleucin sind.Preferred aspartate proteases of the present invention additionally have a sequence PALX6 YX7 VP, where X6 and X7 have the same meaning as X1. However, it is preferred that X6 and X7 are leucine or isoleucine.
Insbesondere handelt es sich bei den Aspartatproteasen um Aspartatproteasen von Säugetieren, insbesondere von Menschen.In particular, the aspartate proteases are aspartate proteases fromMammals, especially humans.
Die erfindungsgemäßen Aspartatproteasen weisen die katalytisch aktiven Aspartatreste in einer Region auf, die innerhalb eines Transmembranbereichs liegt. Transmembranbereiche lassen sich bei Kenntnis der Sequenz eines Proteins aufgrund verschiedener Modelle vorhersagen. Sie sind dadurch gekennzeichnet, daß in einem Bereich überwiegend hydrophobe Aminosäuren liegen, die von Bereichen flankiert werden, in denen eher hydrophile Aminosäuren liegen.The aspartate proteases according to the invention have the catalytically active aspartateremains in a region that lies within a transmembrane region.Transmembrane regions can be based on knowledge of the sequence of a proteinpredict different models. They are characterized in that in oneThe range is predominantly hydrophobic amino acids flanked by areaswhich contain more hydrophilic amino acids.
Besonders bevorzugte Aspartatproteasen der vorliegenden Erfindung werden als psnlike 1 bis 4 bezeichnet. Die humanen und murinen Aminosäuresequenzen sind in derFig. 1 gezeigt.Particularly preferred aspartate proteases of the present invention are referred to as psnlike 1 to 4. The human and murine amino acid sequences are shown inFIG. 1.
Weiterhin sind Varianten der erfindungsgemäßen Aspartatproteasen Gegenstand der Erfindung. Varianten sind Proteine, die durch einen oder mehrere Mutationen, Insertionen und Deletionen, insbesondere durch konservative Austausche, von den erfindungsgemäßen Aspartatproteasen abgeleitet sind. Auch Nucleinsäuren, die für die erfindungsgemäßen Aspartatproteasen kodieren, sind Gegenstand der Erfindung. Bevorzugte erfindungsgemäße Nucleinsäuren sind solche, die in derFig. 2 gezeigt sind. Auch komplementäre Nucleinsäuren sind Bestandteil der Erfindung.The invention furthermore relates to variants of the aspartate proteases according to the invention. Variants are proteins which are derived from the aspartate proteases according to the invention by one or more mutations, insertions and deletions, in particular by conservative exchanges. The invention also relates to nucleic acids which code for the aspartate proteases according to the invention. Preferred nucleic acids according to the invention are those shown inFIG. 2. Complementary nucleic acids are also part of the invention.
Die erfindungsgemäßen Aspartatproteasen sind an der Spaltung des APP zum Aβ beteiligt und sind damit indirekt an der Entstehung beispielsweise der Alzheimerschen Erkrankung beteiligt. Daher sind auch Inhibitoren, die die Expression oder die Aktivität der Aspartatproteasen hemmen, Gegenstand der Erfindung. Solche Inhibitoren können in einfachen Verfahren identifiziert werden. Entsprechende Inhibitoren können beispielsweise durch Messung der Expression oder der Aktivität der Aspartatproteasen in Gegenwart von potentiellen Inhibitoren identifiziert werden. Insbesondere zur Messung der Expression eignen sich gegen die Aspartatprotesasen gerichtete Antikörper, die somit ebenfalls Bestandteil der Erfindung sind.The aspartate proteases according to the invention are at the cleavage of the APP to Aβand are indirectly involved in the development of Alzheimer's, for example Disease involved. Therefore are also inhibitors that the expression or theInhibit the activity of aspartate proteases, object of the invention. SuchInhibitors can be identified in simple procedures. AppropriateInhibitors can be, for example, by measuring expression or activityof the aspartate proteases can be identified in the presence of potential inhibitors.The aspartate protesases are particularly suitable for measuring expressiondirected antibodies, which are therefore also part of the invention.
Die erfindungsgemäßen Aspartatproteasen, Nucleinsäuren, Inhibitoren und Antikörper können in Arznei- und Diagnostikmitteln enthalten sein. Sie eignen sich insbesondere zur Behandlung oder Diagnose von Erkrankungen, die mit der Spaltung des Amyloid IPrecursor Proteins ursächlich verbunden sind, insbesondere der Alzheimerschen Erkrankung.The aspartate proteases, nucleic acids, inhibitors and antibodies according to the inventioncan be contained in medicinal and diagnostic agents. They are particularly suitablefor the treatment or diagnosis of diseases associated with the cleavage of the amyloidIPrecursor proteins are causally linked, especially to Alzheimer'sIllness.
| Application Number | Priority Date | Filing Date | Title | 
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| DE19902550ADE19902550A1 (en) | 1999-01-22 | 1999-01-22 | A novel aspartate protease, coding sequence, inhibitors and antibodies, useful for treatment and diagnosis of Alzheimer's disease | 
| EP00903587AEP1144603A3 (en) | 1999-01-22 | 2000-01-19 | Protease | 
| CA002360585ACA2360585A1 (en) | 1999-01-22 | 2000-01-19 | Protease | 
| AU25421/00AAU2542100A (en) | 1999-01-22 | 2000-01-19 | Protease | 
| PCT/EP2000/000390WO2000043505A2 (en) | 1999-01-22 | 2000-01-19 | Protease with two aspartate radicals in the catalytically active structure | 
| Application Number | Priority Date | Filing Date | Title | 
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| DE19902550ADE19902550A1 (en) | 1999-01-22 | 1999-01-22 | A novel aspartate protease, coding sequence, inhibitors and antibodies, useful for treatment and diagnosis of Alzheimer's disease | 
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