... s )1 ; Q116H, 0.0068 s )1 and Q116N 0.011 s )1 .In the cases of the di-zinc species (i.e. the wild-type and Q116H), these rather similar apparent kivaluesmight correspond to the loss of the ... correspond to the mass of the N-termi-nal peptide (1299 kDa) plus 298 Da, a value that in turncorresponds to the mass of the last three amino acids of the signal peptide, LNA. Another of the unidentifiedpeptides, ... ne-Poulenc(Paris, France). Chloramphenicol, cefoxitin (De260= )6 600 m )1 Æcm )1 ), cephalothin (De273= )6 300 m )1 Æcm )1 ) and EDTA were purchased from Sigma (St Louis, MO,USA) and nitrocefin (De482=...