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首页> 外文期刊>Infection and immunity >Chelating agents inhibit activity and prevent expression of streptococcal glucan-binding lectins.
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Chelating agents inhibit activity and prevent expression of streptococcal glucan-binding lectins.

机译:螯合剂抑制活性并阻止链球菌葡聚糖结合凝集素的表达。

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Several of the cariogenic mutans streptococci produce cell wall-associated glucan-binding lectins (GBLs). The lectins bind alpha-1,6-linked glucans and have no affinity for other polysaccharides or anomeric linkages. When citrate or lactate was included in the growth medium, expression of the activities of the GBLs of Streptococcus cricetus and S. sobrinus was prevented. Furthermore, chelating agents, including citrate, lactate, EDTA, and acetylacetone, were able to reversibly inhibit glucan-induced aggregation of GBL+ streptococci. In addition, the chelating agents prevented sucrose-dependent streptococcal adhesion to glass surfaces and dispersed preformed adherent masses of the streptococci. Neither citrate nor other chelating agents modified the activities of glucosyltransferases. Expression of the lectin could only be achieved by the addition of manganous ion to the growth medium. Chloramphenicol and other metabolic inhibitors prevented synthesis of GBL in cells obtained from manganese-deficient medium and shifted to manganous ion-sufficient medium. The GBL may be a manganoprotein, the manganese of which may be perturbed, but not removed, by chelating agents. During synthesis of the GBL, manganous ion may be required in order for the protein to achieve an active conformation. Citrate or other chelating agents may have promise as anticaries agents.
机译:几种致龋性变形链球菌可产生细胞壁相关的葡聚糖结合凝集素(GBL)。凝集素结合α-1,6-连接的葡聚糖,对其他多糖或异头键没有亲和力。当柠檬酸盐或乳酸盐包括在生长培养基中时,可防止表达链球菌和链球菌链球菌的GBL活性。此外,螯合剂,包括柠檬酸盐,乳酸盐,EDTA和乙酰丙酮,能够可逆地抑制葡聚糖诱导的GBL +链球菌聚集。另外,螯合剂防止了蔗糖依赖性链球菌粘附于玻璃表面,并阻止了链球菌的预先形成的粘附团块分散。柠檬酸盐或其他螯合剂均未改变葡糖基转移酶的活性。凝集素的表达只能通过向生长培养基中添加锰离子来实现。氯霉素和其他代谢抑制剂阻止了从缺锰培养基获得的细胞中GBL的合成,并转移到了含锰离子充足的培养基中。 GBL可以是甘露糖蛋白,其锰可被螯合剂干扰但不能被除去。在GBL的合成过程中,可能需要锰离子以使蛋白质获得活性构象。柠檬酸盐或其他螯合剂有望作为防龋剂。

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