The gene encoding lysostaphin of Staphylococcus staphylolyticus was cloned in Escherichia coli and its DNA sequence was determined. The complete coding region comprises 1440 base pairs corresponding to a precursor of 480 amino acids (molecular weight 51 669). It was shown by NH2-terminal amino acid sequence analysis of the purified extracellular lysostaphin from S. staphylolyticus that the mature lysostaphin consists of 246 amino acid residues (molecular weight 26926). Polyacrylamide gel electrophoresis revealed a similar molecular weight for the most active form. By computer analysis the secondary protein structure was predicted. It revealed three distinct regions in the precursor protein: a typical signal peptide (ca. 38 aa), a hydrophilic and highly ordered protein domain with 14 repetitive sequences (296 aa) and the hydrophobic mature lysostaphin. The lysostaphin precursor protein appears to be organized as a preprolysostaphin.
The complete amino-acid sequence of subunit a of the hemocyanin of the tarantula Eurypelma californicum was determined by manual sequencing. By limited chymotrypsinolysis, subunit a is split into two fragments of 25 kDa and 40 kDa, respectively, only one single peptide bond being attacked. The whole chain contains 15 methionine residues, after cyanogen bromide cleavage, 15 peptides were identified indicating that one residue (Met 85 ) was not split by the cyanogen bromide reaction. For subcleavages, trypsin, chymotrypsin, Staphylococcus aureus proteinase, and Astacus fluviatilis proteinase were employed. The total chain length comprises 627 aminoacid residues, carbohydrate side chains were not found. Hämocyanine aus Spinnen, XXIII. Vollständige Aminosäuresequenz der Untereinheit a des Hämocyanins aus der Vogelspinne Eurypelma californicum Zusammenfassung: Die vollständige Aminosäurese-quenz der Untereinheit a des Hämocyanins der Vogelspinne Eurypelma californicum wurde durch manuelle Mikrosequenzierung bestimmt. Durch limitierte Proteolyse mit Chymotrypsin wird Untereinheit a in zwei Bruchstücke von 25 kDa und 40 kDa gespalten, dabei wird nur eine Peptidbindung angegriffen. Die gesamte Kette enthält 15 Metionin-Reste, nach Bromcyanspaltung können nur 15 Peptide identifiziert werden; Met 85 wird durch Bromcyan nicht angegriffen. Zur Nachspaltung der Peptide wurden Trypsin, Chymotrypsin, Staphylococcus-aureus-Proteinase undAstacus-fluviatilis-Proteinase verwendet. Die gesamte Kettenlänge umfaßt 627 Aminosäurere-ste, Kohlenhydrat-Seitenketten wurden nicht gefunden.
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