Comparative sequence analysis of spa gene of Staphylococcus aureus isolated from bovine mastitis: characterization of an unusual spa gene variant.
The protein A encoding gene spa of four Staphylococcus aureus strains isolated from bovine clinical mastitis was amplified by PCR and sequenced. The four strains were selected after an initial screening of spa gene of 41 strains isolated from mastitic cows and were subjected to detailed investigations. According to the sequencing results the spa gene of three strains (M1, M2, M3) appeared with gene segments encoding five (E, D, A, B and C) and four (E, A, B and C) IgG binding domains for two (M1, M3) and one (M2) strain, respectively and with gene segments encoding four, two and two repeats of the octapeptide Xr-repeats for the strains M1, M2 and M3, respectively. For the remaining Staph. aureus strain (M4) gene segments encoding IgG binding domains E, D and A and a new domain BC with a size of 219 bp could be observed. The BC domain appears, with a deletion of a 123 bp segment from the border region between both domains, as fused domain of both previously characterized domains. The Xr-region of this strain had 11 octapeptide repeats.
Institut für Pharmakologie und Toxikologie, Justus-Liebig-Universität Giessen, Frankfurter Str. 107, 35392 Giessen, Germany.
Amr
A
El-Sayed
Jörg
J
Alber
Christoph
C
Lämmler
Amir
A
Abdulmawjood
Michael
M
Zschöck
V
V
Hugo Castañeda
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D004269:DNA, Bacterial / Q000032:analysis*; D005260:Female; D005784:Gene Amplification; D008414:Mastitis, Bovine / Q000382:microbiology*; D008969:Molecular Sequence Data; D008970:Molecular Weight; D016133:Polymerase Chain Reaction / Q000379:methods / Q000662:veterinary; D013203:Staphylococcal Infections / Q000382:microbiology / Q000662:veterinary; D013205:Staphylococcal Protein A / Q000737:chemistry / Q000235:genetics; D013211:Staphylococcus aureus / Q000235:genetics*
D004269:DNA, Bacterial; D013205:Staphylococcal Protein A