National Institutes of Health/National Institute of Mental Health (NIH/NIMH)
R01 MH114817
米国
引用
ジャーナル: Nature / 年: 2019 タイトル: Visualization of clustered protocadherin neuronal self-recognition complexes. 著者: Julia Brasch / Kerry M Goodman / Alex J Noble / Micah Rapp / Seetha Mannepalli / Fabiana Bahna / Venkata P Dandey / Tristan Bepler / Bonnie Berger / Tom Maniatis / Clinton S Potter / Bridget ...著者: Julia Brasch / Kerry M Goodman / Alex J Noble / Micah Rapp / Seetha Mannepalli / Fabiana Bahna / Venkata P Dandey / Tristan Bepler / Bonnie Berger / Tom Maniatis / Clinton S Potter / Bridget Carragher / Barry Honig / Lawrence Shapiro / 要旨: Neurite self-recognition and avoidance are fundamental properties of all nervous systems. These processes facilitate dendritic arborization, prevent formation of autapses and allow free interaction ...Neurite self-recognition and avoidance are fundamental properties of all nervous systems. These processes facilitate dendritic arborization, prevent formation of autapses and allow free interaction among non-self neurons. Avoidance among self neurites is mediated by stochastic cell-surface expression of combinations of about 60 isoforms of α-, β- and γ-clustered protocadherin that provide mammalian neurons with single-cell identities. Avoidance is observed between neurons that express identical protocadherin repertoires, and single-isoform differences are sufficient to prevent self-recognition. Protocadherins form isoform-promiscuous cis dimers and isoform-specific homophilic trans dimers. Although these interactions have previously been characterized in isolation, structures of full-length protocadherin ectodomains have not been determined, and how these two interfaces engage in self-recognition between neuronal surfaces remains unknown. Here we determine the molecular arrangement of full-length clustered protocadherin ectodomains in single-isoform self-recognition complexes, using X-ray crystallography and cryo-electron tomography. We determine the crystal structure of the clustered protocadherin γB4 ectodomain, which reveals a zipper-like lattice that is formed by alternating cis and trans interactions. Using cryo-electron tomography, we show that clustered protocadherin γB6 ectodomains tethered to liposomes spontaneously assemble into linear arrays at membrane contact sites, in a configuration that is consistent with the assembly observed in the crystal structure. These linear assemblies pack against each other as parallel arrays to form larger two-dimensional structures between membranes. Our results suggest that the formation of ordered linear assemblies by clustered protocadherins represents the initial self-recognition step in neuronal avoidance, and thus provide support for the isoform-mismatch chain-termination model of protocadherin-mediated self-recognition, which depends on these linear chains.
根拠: microscopy, Sedimentation equilibrium analytical ultracentrifugation experiments show that PcdhgB4 EC1-6 is a dimer-of-dimers in solution. However in both the crystal structure and cryo- ...根拠: microscopy, Sedimentation equilibrium analytical ultracentrifugation experiments show that PcdhgB4 EC1-6 is a dimer-of-dimers in solution. However in both the crystal structure and cryo-electron tomography of PcdhgB4 on membrane reveals a one-dimensional lattice of alternating C-terminal (cis) and N-terminal (trans) interactions, the same as those used to form the dimer-of-dimers observed in solution but generating a polymer rather than a discrete dimer-of-dimers.
タイプ
名称
対称操作
数
identity operation
1_555
x,y,z
1
Buried area
6270 Å2
ΔGint
-86 kcal/mol
Surface area
72640 Å2
手法
PISA
単位格子
Length a, b, c (Å)
127.730, 87.580, 149.330
Angle α, β, γ (deg.)
90.000, 109.940, 90.000
Int Tables number
4
Space group name H-M
P1211
Space group name Hall
P2yb
非結晶学的対称性 (NCS)
NCSドメイン:
ID
Ens-ID
1
1
2
1
NCSドメイン領域:
Ens-ID: 1 / Beg auth comp-ID: GLN / Beg label comp-ID: GLN
Dom-ID
Component-ID
End auth comp-ID
End label comp-ID
Selection details
Auth asym-ID
Label asym-ID
Auth seq-ID
Label seq-ID
1
1
SER
SER
(chain 'A' and (resid2through5or (resid6...
A
A
2 - 252
2 - 252
1
2
PHE
PHE
(chain 'A' and (resid2through5or (resid6...
A
A
259 - 632
259 - 632
2
1
SER
SER
(chain 'B' and (resid2through10or (resid11...
B
B
2 - 252
2 - 252
2
2
PHE
PHE
(chain 'B' and (resid2through10or (resid11...
B
B
259 - 632
259 - 632
詳細
Sedimentation equilibrium analytical ultracentrifugation experiments show that PcdhgB4 EC1-6 is a dimer-of-dimers in solution. However in both the crystal structure and cryo-electron tomography of PcdhgB4 on membrane reveals a one-dimensional lattice of alternating C-terminal (cis) and N-terminal (trans) interactions, the same as those used to form the dimer-of-dimers observed in solution but generating a polymer rather than a discrete dimer-of-dimers.
-
要素
-
タンパク質 / 非ポリマー , 2種, 32分子 AB
#1: タンパク質
ProtocadheringammaB4 / Protocadherin gamma subfamily B / 4
解像度: 4.52→38.29 Å / SU ML: 0.7857 / 交差検証法: FREE R-VALUE / σ(F): 1.35 / 位相誤差: 34.4867 詳細: Due to the severe anisotropy of the data ellipsoidal resolution limits of 6.8, 6.0, and 4.5 angstroms were applied along the three principal axes. The completeness with respect to a sphere at ...詳細: Due to the severe anisotropy of the data ellipsoidal resolution limits of 6.8, 6.0, and 4.5 angstroms were applied along the three principal axes. The completeness with respect to a sphere at 4.5 angstroms is therefore very low (46.9%), however the completeness within the ellipsoidal limits is 93.4%.