Nanobodies against Pfs230 block Plasmodium falciparum transmission

被引：15

作者：

Dietrich, Melanie H. ^{[1
,2
]}

Gabriela, Mikha ^{[1
,2
]}

Reaksudsan, Kitsanapong ^{[1
,2
]}

Dixon, Matthew W. A. ^{[1
,3
]}

Chan, Li-Jin ^{[1
,2
]}

Adair, Amy ^{[1
]}

Trickey, Stephanie ^{[1
]}

'Neill, Matthew T. O. ^{[1
]}

Tan, Li Lynn ^{[1
]}

Lopaticki, Sash ^{[1
,3
]}

Healer, Julie ^{[1
]}

Keremane, Sravya ^{[1
]}

Cowman, Alan F. ^{[1
,2
]}

Tham, Wai-Hong ^{[1
,2
]}

机构：

[1] Walter & Eliza Hall Inst Med Res, Infect Dis & Immune Def Div, Parkville, Vic 3052, Australia

[2] Univ Melbourne, Dept Med Biol, Melbourne, Vic 3010, Australia

[3] Univ Melbourne, Peter Doherty Inst Infect & Immun, Dept Infect Dis, Melbourne, Australia

来源：

BIOCHEMICAL JOURNAL | 2022年 / 479卷 / 24期

基金：

英国医学研究理事会;

关键词：

PROTEIN; GAMETOCYTES; GENERATION; PFS48/45; ANTIGENS; SYSTEM;

D O I：

10.1042/BCJ20220554

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

070307 [化学生物学]; 071010 [生物化学与分子生物学];

摘要：

Transmission blocking interventions can stop malaria parasite transmission from mos-quito to human by inhibiting parasite infection in mosquitos. One of the most advanced candidates for a malaria transmission blocking vaccine is Pfs230. Pfs230 is the largest member of the 6-cysteine protein family with 14 consecutive 6-cysteine domains and is expressed on the surface of gametocytes and gametes. Here, we present the crystal structure of the first two 6-cysteine domains of Pfs230. We identified high affinity Pfs230-specific nanobodies that recognized gametocytes and bind to distinct sites on Pfs230, which were isolated from immunized alpacas. Using two non-overlapping Pfs230 nano -bodies, we show that these nanobodies significantly blocked P. falciparum transmission and reduced the formation of exflagellation centers. Crystal structures of the transmission blocking nanobodies with the first 6-cysteine domain of Pfs230 confirm that they bind to different epitopes. In addition, these nanobodies bind to Pfs230 in the absence of the prodomain, in contrast with the binding of known Pfs230 transmission blocking anti-bodies. These results provide additional structural insight into Pfs230 domains and eluci-date a mechanism of action of transmission blocking Pfs230 nanobodies.

引用

页码：2529 / 2546

页数：18

共 44 条

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