ジャーナル: Cell Res / 年: 2025 タイトル: Activation of the SPARDA defense system by filament assembly using a beta-relay signaling mechanism widespread in prokaryotic Argonautes. 著者: Edvinas Jurgelaitis / Evelina Zagorskaitė / Aurimas Kopūstas / Simonas Asmontas / Elena Manakova / Indrė Dalgėdienė / Ugnė Tylenytė / Arunas Silanskas / Paulius Toliusis / Algirdas ...著者: Edvinas Jurgelaitis / Evelina Zagorskaitė / Aurimas Kopūstas / Simonas Asmontas / Elena Manakova / Indrė Dalgėdienė / Ugnė Tylenytė / Arunas Silanskas / Paulius Toliusis / Algirdas Grybauskas / Marijonas Tutkus / Česlovas Venclovas / Mindaugas Zaremba 要旨: Present in all three domains of life, Argonaute proteins use short oligonucleotides as guides to recognize complementary nucleic acid targets. In eukaryotes, Argonautes are involved in RNA silencing, ...Present in all three domains of life, Argonaute proteins use short oligonucleotides as guides to recognize complementary nucleic acid targets. In eukaryotes, Argonautes are involved in RNA silencing, whereas in prokaryotes, they function in host defense against invading DNA. Here, we show that SPARDA (short prokaryotic Argonaute, DNase associated) systems from Xanthobacter autotrophicus (Xau) and Enhydrobacter aerosaccus (Eae) function in anti-plasmid defense. Upon activation, SPARDA nonspecifically degrades both invader and genomic DNA, causing host death, thereby preventing further spread of the invader in the population. X-ray structures of the apo Xau and EaeSPARDA complexes show that they are dimers, unlike other apo short pAgo systems, which are monomers. We show that dimerization in the apo state is essential for inhibition of XauSPARDA activity. We demonstrate by cryo-EM that activated XauSPARDA forms a filament. Upon activation, the recognition signal of the bound guide/target duplex is relayed to other functional XauSPARDA sites through a structural region that we termed the "beta-relay". Owing to dramatic conformational changes associated with guide/target binding, XauSPARDA undergoes a "dimer-monomer-filament" transition as the apo dimer dissociates into the guide/target-loaded monomers that subsequently assemble into the filament. Within the activated filament, the DREN nuclease domains form tetramers that are poised to cleave dsDNA. We show that other SPARDAs also form filaments during activation. Furthermore, we identify the presence of the beta-relay in pAgo from all clades, providing new insights into the structural mechanisms of pAgo proteins. Taken together, these findings reveal the detailed structural mechanism of SPARDA and highlight the importance of the beta-relay mechanism in signal transduction in Argonautes.
履歴
登録
2025年3月4日
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#89 - 2007年5月 アコニターゼと鉄調節タンパク質1 (Aconitase and Iron Regulatory Protein 1) 類似性 (1)
#241 - 2020年1月 20年の分子を振り返って (Twenty Years of Molecules) 類似性 (2)
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集合体
登録構造単位
A: DUF4365 domain-containing protein B: Protein argonaute C: DNA (5'-D(*AP*TP*TP*CP*GP*GP*CP*CP*GP*TP*GP*TP*AP*CP*AP*AP*T)-3') D: RNA (5'-R(P*AP*UP*UP*GP*UP*AP*CP*AP*CP*GP*GP*CP*CP*GP*AP*AP*U)-3') E: DUF4365 domain-containing protein F: Protein argonaute G: DNA (5'-D(*AP*TP*TP*CP*GP*GP*CP*CP*GP*TP*GP*TP*AP*CP*AP*AP*T)-3') H: RNA (5'-R(P*AP*UP*UP*GP*UP*AP*CP*AP*CP*GP*GP*CP*CP*GP*AP*AP*U)-3') I: DUF4365 domain-containing protein J: Protein argonaute K: DNA (5'-D(*AP*TP*TP*CP*GP*GP*CP*CP*GP*TP*GP*TP*AP*CP*AP*AP*T)-3') L: RNA (5'-R(P*AP*UP*UP*GP*UP*AP*CP*AP*CP*GP*GP*CP*CP*GP*AP*AP*U)-3') M: DUF4365 domain-containing protein N: Protein argonaute O: DNA (5'-D(*AP*TP*TP*CP*GP*GP*CP*CP*GP*TP*GP*TP*AP*CP*AP*AP*T)-3') P: RNA (5'-R(P*AP*UP*UP*GP*UP*AP*CP*AP*CP*GP*GP*CP*CP*GP*AP*AP*U)-3') Q: DUF4365 domain-containing protein R: Protein argonaute 1: DNA (5'-D(*AP*TP*TP*CP*GP*GP*CP*CP*GP*TP*GP*TP*AP*CP*AP*AP*T)-3') 2: RNA (5'-R(P*AP*UP*UP*GP*UP*AP*CP*AP*CP*GP*GP*CP*CP*GP*AP*AP*U)-3') U: DUF4365 domain-containing protein V: Protein argonaute 3: DNA (5'-D(*AP*TP*TP*CP*GP*GP*CP*CP*GP*TP*GP*TP*AP*CP*AP*AP*T)-3') 4: RNA (5'-R(P*AP*UP*UP*GP*UP*AP*CP*AP*CP*GP*GP*CP*CP*GP*AP*AP*U)-3') X: Protein argonaute W: DUF4365 domain-containing protein 5: DNA (5'-D(*AP*TP*TP*CP*GP*GP*CP*CP*GP*TP*GP*TP*AP*CP*AP*AP*T)-3') 6: RNA (5'-R(P*AP*UP*UP*GP*UP*AP*CP*AP*CP*GP*GP*CP*CP*GP*AP*AP*U)-3') Y: DUF4365 domain-containing protein Z: Protein argonaute 7: DNA (5'-D(*AP*TP*TP*CP*GP*GP*CP*CP*GP*TP*GP*TP*AP*CP*AP*AP*T)-3') 8: RNA (5'-R(P*AP*UP*UP*GP*UP*AP*CP*AP*CP*GP*GP*CP*CP*GP*AP*AP*U)-3') S: dsDNA substrate, first strand T: dsDNA substrate, second strand ヘテロ分子
SPARDA binary monomers are activated upon binding of guide 5'p-RNA and complementary DNA target (component 1). Activated monomers oligomerise into filament-like structure, that supports the tetrameric assembly of DREN-domains (component 2) which unspecifically binds dsDNA substrate
#1-#6
0
RECOMBINANT
2
Activated XauSPARDA binary monomer containing bound 5'p-RNA guide and complementary DNA target
COMPLEX
XauSPARDA binary monomer binds 5'p-RNA guide and complementary DNA target strand in the presence of calcium ion
#1-#4
1
RECOMBINANT
3
DREN-domains tetramer with bound dsDNA substrate
COMPLEX
DREN-domains tetramer assembled upon oligomerization of activated binary monomers in the presence of dsDNA and calcium
#1, #5-#6
1
RECOMBINANT
分子量
ID
Entity assembly-ID
値 (°)
実験値
1
1
1.028MDa
NO
2
1
0.127MDa
NO
3
1
0.22MDa
NO
4
1
NO
由来(天然)
ID
Entity assembly-ID
生物種
Ncbi tax-ID
2
1
Xanthobacter autotrophicus Py2 (バクテリア)
78245
3
2
Xanthobacter autotrophicus Py2 (バクテリア)
78245
4
3
Xanthobacter autotrophicus Py2 (バクテリア)
78245
由来(組換発現)
ID
Entity assembly-ID
生物種
Ncbi tax-ID
株
プラスミド
2
1
Escherichia coli (大腸菌)
562
BL21
pBAD
3
2
Escherichia coli (大腸菌)
562
BL21
pBAD
4
3
Escherichia coli (大腸菌)
562
BL21
pBAD
緩衝液
pH: 8
緩衝液成分
ID
濃度
名称
Buffer-ID
1
20mM
trisHCl
1
2
100mM
NaCl
1
3
2mM
CACl2
1
試料
濃度: 1.96 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Solution containing activated XauSPARDA monomers was mixed with solution containing dsDNA substrate and centrifugated before applying on the grid.