Abstract: The present invention describes a method for isolating a target compound from a plant, the method comprising obtaining a plant extract, passing such plant extract through a ceramic filter to obtain a permeate, and purifying the target compound from such permeate. This method, among other things, allows ultrafiltration of crude plant extracts, such as green juice homogenates.

Abstract: The present invention relates to plant produced native aprotinin and aprotinin variants having enzyme-inhibitory, immunological and pharmacokinetic properties and their preparation. In a preferred method a recombinant RNA plant virus is used to express native aprotinin+variants thereof in Nicotiana plants.

Abstract: The invention relates to ?-galactosidase truncated at the carboxy terminus and the production of enzymatically active recombinant human and animal lysosomal enzymes involving construction and expression of recombinant expression constructs comprising coding sequences of human or animal lysosomal enzymes in a plant expression system. The plant expression system provides for post-translational modification and processing to produce a recombinant gene product exhibiting enzymatic activity. The invention is demonstrated by working examples in which transgenic tobacco plants express recombinant expression constructs comprising human glucocerebrosidase nucleotide sequences. The invention is also demonstrated by working examples in which transfected tobacco plants express recombinant viral expression constructs comprising human ? galactosidase nucleotide sequences.

Abstract: A method for extracting proteins from the intercellular space of plants is provided. The method is applicable to the large scale isolation of many active proteins of interest synthesized by plant cells. The method may be used commercially to recover recombinantly produced proteins from plant hosts thereby making the large scale use of plants as sources for recombinant protein production feasible.