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Syncollin is an antibacterial polypeptide
Cellular Microbiology ( IF 2.6 ) Pub Date : 2021-06-21 , DOI: 10.1111/cmi.13372
Rosie A Waters 1 , James Robinson 2 , J Michael Edwardson 1
Affiliation  

Syncollin is a 16-kDa protein found predominantly in the zymogen granules of pancreatic acinar cells, with expression at lower levels in intestinal epithelial cells and neutrophils. Here, we used Strep-tagged syncollin isolated from the supernatant of transiently transfected mammalian cells to test the hypothesis that syncollin has antibacterial properties, which might enable it to play a role in host defence in the gut and possibly elsewhere. We show that syncollin is an exceptionally thermostable protein with a circular dichroism spectrum consistent with a predominantly beta-sheet structure. Syncollin binds to bacterial peptidoglycan and restricts the growth of representative Gram-positive (Lactococcus lactis) and Gram-negative (Escherichia coli) bacteria. Syncollin induces propidium iodide uptake into E. coli (but not L. lactis), indicating permeabilisation of the bacterial membrane. It also causes surface structural damage in both L. lactis and E. coli, as visualised by scanning electron microscopy. We propose that syncollin is a previously unidentified member of a large group of antimicrobial polypeptides that control the gut microbiome.

中文翻译:

Syncollin是一种抗菌多肽

Syncollin 是一种 16 kDa 的蛋白质,主要存在于胰腺腺泡细胞的酶原颗粒中,在肠上皮细胞和中性粒细胞中表达水平较低。在这里,我们使用从瞬时转染的哺乳动物细胞上清液中分离出来的带有 Strep 标记的 syncollin 来检验 syncollin 具有抗菌特性的假设,这可能使其能够在肠道和其他地方的宿主防御中发挥作用。我们表明 syncollin 是一种非常耐热的蛋白质,具有圆二色光谱,与主要的 β 折叠结构一致。Syncollin 与细菌肽聚糖结合并限制代表性革兰氏阳性(乳酸乳球菌)和革兰氏阴性(大肠杆菌)的生长) 细菌。Syncollin 诱导碘化丙啶被大肠杆菌(但不是乳酸乳球菌)吸收,表明细菌膜的透化作用。如扫描电子显微镜所见,它还会导致乳酸乳球菌大肠杆菌的表面结构损伤。我们提出 syncollin 是控制肠道微生物组的一大群抗菌多肽中的一个先前未知的成员。
更新日期:2021-06-21
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