DETAILED DESCRIPTION OF THE INVENTION The enzyme or enzyme preparation of the invention is obtainable from or endogeneous to a strain belonging to the genus Saccharothrix, preferably from the species selected from the group consisting of Saccharothrix australiensis, Saccharothrix texasensis, Saccharothrix waywayandensis, Saccharothrix cryophilis, Saccharothrix flava, Saccharothrix coeruleofusca, Saccharothrix longispora, Saccharothrix mutabilis ssp.
capreolus, Saccharothrix aerocolonigenes, Saccharothrix mutabilis ssp.
mutabilis, Saccharothrix syringae, Saccharothrix sp.
Examples of useful strains are Saccharothrix australiensis, IFO 14444, Saccharothrix texasensis, NRRL B-16134, Saccharothrix waywayandensis, NRRL B-16159, Saccharothrix cryophilis, NRRL B-16238, Saccharothrix sp.
, IFO 13785, Saccharothrix flava, ATCC 29533, Saccharothrix coeruleofusca (Actinomadura coeruleofusca), ATCC 35108 or DSM 43679, Saccharothrix longispora (Actinomadura longispora), ATCC 31109 or DSM 43749, Saccharothrix mutabilis ssp.
mutabilis, ATCC 31520, Saccharothrix aerocolonigenes, ATCC 23870, Saccharothrix mutabilis ssp.
capreolus, ATCC 23892, Saccharothrix mutabilis, DSM 40225 or DSM 43853, Saccharothrix syringae, DSM 43886.
The enzyme and the enzyme preparation of the invention is active over a broad pH range, preferably active at a pH between about 4 and about 11, preferably between about 5.
5 and about 10.
In a preferred embodiment, the enzyme or the enzyme preparation of the invention belongs to family 6 of glycosyl hydrolases (Henrissat et al.
, op.
cit.
).
In the present context the term "expression vector" denotes a DNA molecule, linear or circular, that comprises a segment encoding a polypeptide of interest operably linked to additional segments that provide for its transcription.
Such additional segments may include promoter and terminator sequences, and may optionally include one or more origins of replication, one or more selectable markers, an enhancer, a polyadenylation signal, and the like.
Expression vectors are generally derived from plasmid or viral DNA, or may contain elements of both
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Molecular Biology 
