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- Ben Nasr, Abdelhakim (author)
Streptokinase activates plasminogen bound to human group C and group G streptococci through M-like proteins
- Article/chapterEnglish1994
Publisher, publication year, extent ...
- 1994
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- LIBRIS-ID:oai:lup.lub.lu.se:98dd8cd9-724d-4011-88c3-190f2295781b
- https://lup.lub.lu.se/record/31097URI
- https://lup.lub.lu.se/record/1216606URI
Supplementary language notes
- Language:English
- Summary in:English
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Notes
- An ability to interact with plasminogen or plasmin could provide micro-organisms with a mechanism for invasion. Thus, group A, C and G streptococci secrete streptokinase which binds and activates plasminogen. Some streptococci also express surface structures which bind plasminogen without causing its activation. Plasminogen-binding surface proteins were extracted from one group C and one group G streptococcal isolate. Both proteins were found to bind plasmin, fibrinogen and serum albumin in addition to plasminogen. Gene fragments encoding the streptococcal proteins were amplified by PCR and were subsequently cloned and expressed in Escherichia coli. DNA sequence determination revealed for both genes open reading frames encoding proteins which contained repetitive domains and a carboxyl-terminal unrepeated region that were typical of M and M-like proteins. Though the amino-terminal regions of the group C and G streptococcal proteins demonstrated a rather high overall similarity between themselves, they were not similar to the variable regions of other M-like proteins with one exception: there was a 46% identity between the first 22 amino acids of the group G streptococcal protein and the corresponding sequence of PAM, the plasminogen-binding M-like protein of type M53 group A streptococci. Like the proteins extracted from the streptococci, the recombinant proteins bound plasminogen, fibrinogen and albumin. The three plasma proteins bound to separate sites on the streptococcal M-like proteins. Plasminogen bound by the group C and G streptococcal proteins was readily activated by streptokinase, providing evidence for a functional link between the secreted plasminogen-activator and proteins exposed on the bacterial surface.
Subject headings and genre
- MEDICIN OCH HÄLSOVETENSKAP Medicinska och farmaceutiska grundvetenskaper Immunologi inom det medicinska området hsv//swe
- MEDICAL AND HEALTH SCIENCES Basic Medicine Immunology in the medical area hsv//eng
- MEDICIN OCH HÄLSOVETENSKAP Medicinska och farmaceutiska grundvetenskaper Mikrobiologi inom det medicinska området hsv//swe
- MEDICAL AND HEALTH SCIENCES Basic Medicine Microbiology in the medical area hsv//eng
Added entries (persons, corporate bodies, meetings, titles ...)
- Wistedt, Annika (author)
- Ringdahl, UlrikaLund University,Lunds universitet,Institutionen för immunteknologi,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Immunotechnology,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)mmb-uri (author)
- Sjöbring, UlfLund University,Lunds universitet,Avdelningen för mikrobiologi, immunologi och glykobiologi - MIG,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Microbiology, Immunology and Glycobiology - MIG,Department of Laboratory Medicine,Faculty of Medicine(Swepub:lu)mmb-usj (author)
- Institutionen för immunteknologiInstitutioner vid LTH (creator_code:org_t)
Related titles
- In:European Journal of Biochemistry222:2, s. 76-2670014-2956
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