Abstract: There are provided methods for the expression of a recombinant protein of interest, said methods comprising, in additional to various additional steps: a) culturing a host cell which expresses: i) one or more genes encoding the recombinant protein(s) of interest; ii) at least two genes encoding proteins selected from the group consisting of the chaperone proteins GroEL, GRoES, Dnak, DnaJ, GRpe, ClpB and their homologs (for example, Hsp104, Ydj1 and Ssa1 in yeast); under conditions suitable for protein expression; and separating said recombinant protein of interest from the host cell culture. Also provided are methods for increasing the degree of refolding of a recombinant protein of interest by ading a composition containing a chaperone protein to a preparation of the recombinant protein of interest in vitro.

Abstract: Process for the enantioselective conversion of an enantiomer mixture of 2R.sub.1,2R.sub.2 -1,3-dioxolane-4-methanol including the following steps: combining the enantioselective enzyme, PQQ-dependent alcohol dehydrogenase with an enantiomer mixture of 2R.sub.1, 2R.sub.2 -1,3-dioxolane-4-methanol of the formula: ##STR1## where R.sub.1 and R.sub.2 independently are selected from the group consisting of hydrogen, an optionally branched alkyl group, an aryl, and R.sub.1 and R.sub.2 with the carbon atom to which they are attached being an optionally substituted carbocyclic ring, the combination of ingredients producing 2R.sub.1,2R.sub.2 -3-dioxolane-4-methanol enriched in the S-enantiomer i.e. S-2R.sub.1,2R.sub.2 -1,3-dioxolane-4-methanol.