National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01AI118932
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
F32 AI150027-01
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
2T32DK007673
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
S10OD020011
米国
引用
ジャーナル: Elife / 年: 2021 タイトル: Cryo-EM reveals new species-specific proteins and symmetry elements in the Dot/Icm T4SS. 著者: Michael J Sheedlo / Clarissa L Durie / Jeong Min Chung / Louise Chang / Jacquelyn Roberts / Michele Swanson / Dana Borden Lacy / Melanie D Ohi / 要旨: is an opportunistic pathogen that causes the potentially fatal pneumonia known as Legionnaires' disease. The pathology associated with infection depends on bacterial delivery of effector proteins ... is an opportunistic pathogen that causes the potentially fatal pneumonia known as Legionnaires' disease. The pathology associated with infection depends on bacterial delivery of effector proteins into the host via the membrane spanning Dot/Icm type IV secretion system (T4SS). We have determined sub-3.0 Å resolution maps of the Dot/Icm T4SS core complex by single particle cryo-EM. The high-resolution structural analysis has allowed us to identify proteins encoded outside the Dot/Icm genetic locus that contribute to the core T4SS structure. We can also now define two distinct areas of symmetry mismatch, one that connects the C18 periplasmic ring (PR) and the C13 outer membrane cap (OMC) and one that connects the C13 OMC with a 16-fold symmetric dome. Unexpectedly, the connection between the PR and OMC is DotH, with five copies sandwiched between the OMC and PR to accommodate the symmetry mismatch. Finally, we observe multiple conformations in the reconstructions that indicate flexibility within the structure.
AF: DotF XH: Type IV secretion protein IcmK BF: DotF YH: Type IV secretion protein IcmK ZH: Type IV secretion protein IcmK AX: Unknown protein fragment BX: Unknown protein fragment CX: Unknown protein fragment DX: Unknown protein fragment EX: Unknown protein fragment FX: Unknown protein fragment GX: Unknown protein fragment HX: Unknown protein fragment IX: Unknown protein fragment JX: Unknown protein fragment KX: Unknown protein fragment LX: Unknown protein fragment MX: Unknown protein fragment VX: Unknown protein fragment WX: Unknown protein fragment XX: Unknown protein fragment YX: Unknown protein fragment ZX: Unknown protein fragment CF: DotF DF: DotF EF: DotF FF: DotF IG: IcmE protein GF: DotF HF: DotF IF: DotF JF: DotF KF: DotF LF: DotF MF: DotF VF: DotF WF: DotF XF: DotF YF: DotF ZF: DotF AG: IcmE protein BG: IcmE protein CG: IcmE protein DG: IcmE protein EG: IcmE protein FG: IcmE protein GG: IcmE protein HG: IcmE protein JG: IcmE protein KG: IcmE protein LG: IcmE protein MG: IcmE protein VG: IcmE protein WG: IcmE protein XG: IcmE protein YG: IcmE protein ZG: IcmE protein AH: Type IV secretion protein IcmK BH: Type IV secretion protein IcmK CH: Type IV secretion protein IcmK DH: Type IV secretion protein IcmK EH: Type IV secretion protein IcmK FH: Type IV secretion protein IcmK GH: Type IV secretion protein IcmK HH: Type IV secretion protein IcmK IH: Type IV secretion protein IcmK JH: Type IV secretion protein IcmK KH: Type IV secretion protein IcmK LH: Type IV secretion protein IcmK MH: Type IV secretion protein IcmK VH: Type IV secretion protein IcmK WH: Type IV secretion protein IcmK
The protein fragment sequence could not be directly identified as the sample was purified from a ...The protein fragment sequence could not be directly identified as the sample was purified from a native source.