National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM144130
米国
引用
ジャーナル: Nat Commun / 年: 2024 タイトル: Insights into phosphoethanolamine cellulose synthesis and secretion across the Gram-negative cell envelope. 著者: Preeti Verma / Ruoya Ho / Schuyler A Chambers / Lynette Cegelski / Jochen Zimmer / 要旨: Phosphoethanolamine (pEtN) cellulose is a naturally occurring modified cellulose produced by several Enterobacteriaceae. The minimal components of the E. coli cellulose synthase complex include the ...Phosphoethanolamine (pEtN) cellulose is a naturally occurring modified cellulose produced by several Enterobacteriaceae. The minimal components of the E. coli cellulose synthase complex include the catalytically active BcsA enzyme, a hexameric semicircle of the periplasmic BcsB protein, and the outer membrane (OM)-integrated BcsC subunit containing periplasmic tetratricopeptide repeats (TPR). Additional subunits include BcsG, a membrane-anchored periplasmic pEtN transferase associated with BcsA, and BcsZ, a periplasmic cellulase of unknown biological function. While cellulose synthesis and translocation by BcsA are well described, little is known about its pEtN modification and translocation across the cell envelope. We show that the N-terminal cytosolic domain of BcsA positions three BcsG copies near the nascent cellulose polymer. Further, the semicircle's terminal BcsB subunit tethers the N-terminus of a single BcsC protein in a trans-envelope secretion system. BcsC's TPR motifs bind a putative cello-oligosaccharide near the entrance to its OM pore. Additionally, we show that only the hydrolytic activity of BcsZ but not the subunit itself is necessary for cellulose secretion, suggesting a secretion mechanism based on enzymatic removal of translocation incompetent cellulose. Lastly, protein engineering introduces cellulose pEtN modification in orthogonal cellulose biosynthetic systems. These findings advance our understanding of pEtN cellulose modification and secretion.
タンパク質・ペプチド: Cellulose synthase BcsB-BcsC fusion protein
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超分子 #1: Cellulose synthase BcsB-BcsC fusion protein
超分子
名称: Cellulose synthase BcsB-BcsC fusion protein / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: Proteins: -Bacterial cellulose synthase subunit B (BcsB) -Bacterial cellulose synthase subunit C (BcsC) The BcsC is at the amino-terminus of the construct, so the order is BcsC-linker-BcsB.
由来(天然)
生物種: Escherichia coli (大腸菌)
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分子 #1: Cellulose synthase BcsB-BcsC fusion protein
分子
名称: Cellulose synthase BcsB-BcsC fusion protein / タイプ: protein_or_peptide / ID: 1 詳細: N-terminal domain of BcsC (including its first 4 TPRs) was fused to the N-terminus of BcsB via a Gly-Ser linker. The BcsC is at the amino-terminus of the construct, so the order is BcsC-linker-BcsB. コピー数: 1 / 光学異性体: LEVO