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A mycobacterial ABC transporter mediates the uptake of hydrophilic compounds

机译:分枝杆菌ABC转运蛋白介导亲水性化合物的吸收

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Mycobacterium tuberculosis (Mtb) is an obligate human pathogen and the causative agent of tuberculosis(1-3). Although Mtb can synthesize vitamin B-12 (cobalamin) de novo, uptake of cobalamin has been linked to pathogenesis of tuberculosis2. Mtb does not encode any characterized cobalamin transporter(4-6); however, the gene rv1819c was found to be essential for uptake of cobalamin(1). This result is difficult to reconcile with the original annotation of Rv1819c as a protein implicated in the transport of antimicrobial peptides such as bleomycin(7). In addition, uptake of cobalamin seems inconsistent with the amino acid sequence, which suggests that Rv1819c has a bacterial ATP-binding cassette (ABC)-exporter fold1. Here, we present structures of Rv1819c, which reveal that the protein indeed contains the ABC-exporter fold, as well as a large water-filled cavity of about 7,700 angstrom(3), which enables the protein to transport the unrelated hydrophilic compounds bleomycin and cobalamin. On the basis of these structures, we propose that Rv1819c is a multi-solute transporter for hydrophilic molecules, analogous to the multidrug exporters of the ABC transporter family, which pump out structurally diverse hydrophobic compounds from cells(8-11).
机译:结核分枝杆菌(Mtb)是人类的专性病原体,是结核的病原体(1-3)。尽管Mtb可以从头合成维生素B-12(钴胺素),但钴胺素的摄取与结核病的发病机理有关2。 Mtb不编码任何特征的钴胺素转运蛋白(4-6);然而,发现rv1819c基因对于摄取钴胺素至关重要(1)。这个结果很难与Rv1819c的最初注释相吻合,Rv1819c是一种与抗菌肽(如博来霉素)的运输有关的蛋白质(7)。此外,钴胺素的摄取似乎与氨基酸序列不一致,这表明Rv1819c具有细菌ATP结合盒(ABC)-出口子fold1。在这里,我们介绍了Rv1819c的结构,该结构揭示了该蛋白确实包含ABC出口折叠,以及约7700埃的充水大腔(3),使该蛋白能够运输无关的亲水性化合物博来霉素和钴胺素。基于这些结构,我们提出Rv1819c是亲水分子的多溶质转运蛋白,类似于ABC转运蛋白家族的多药出口蛋白,它从细胞中抽出结构多样的疏水化合物(8-11)。

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  • 来源
    《Nature》 |2020年第7803期|409-412|共4页
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    Univ Groningen Groningen Biomol Sci & Biotechnol Inst GBB Groningen Netherlands|Univ Basel Struct Biol & Biophys Biozentrum Basel Switzerland;

    SLAC Natl Accelerator Lab Menlo Pk CA USA|Stanford Univ Sch Med Dept Biol Struct Palo Alto CA 94304 USA;

    Univ Groningen Groningen Biomol Sci & Biotechnol Inst GBB Groningen Netherlands;

    Stockholm Univ Dept Biochem & Biophys Stockholm Sweden;

    Univ Groningen Groningen Biomol Sci & Biotechnol Inst GBB Groningen Netherlands|Moscow Inst Phys & Technol Dolgoprudny Moscow Russia;

    Univ Groningen Groningen Biomol Sci & Biotechnol Inst GBB Groningen Netherlands|Univ Groningen Zernike Inst Adv Mat Groningen Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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