A gene bank of Peptostreptococcus magnus DNA was established using an
E. coli host-vector system. Western blot analysis identified a clone e
xpressing protein L which bound to the light chain of human immunoglob
ulins. DNA sequence determination and analysis revealed an open readin
g frame of 992 amino acids, giving a theoretical secreted protein of 1
06 kD with a pl of 4.67.