- EMDB-45363: Cryo-EM structure of the C1q A, B-crt, C peptide assembly narrow ... -
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データベース: EMDB / ID: EMD-45363
タイトル
Cryo-EM structure of the C1q A, B-crt, C peptide assembly narrow region
マップデータ
This is the primary map that should be view for interpretation of our atomic modeling results. Achieved after filtering, masking out the uninterpretable density and then sharpening with EM ready.
試料
複合体: Narrow region structure of the octadecameric C1q A, B-crt, C peptide assembly
タンパク質・ペプチド: Peptide from Complement C1q subcomponent subunit B
タンパク質・ペプチド: Peptide from Complement C1q subcomponent subunit A
タンパク質・ペプチド: Peptide from Complement C1q subcomponent subunit C
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM122510
米国
National Science Foundation (NSF, United States)
CHE 2203937
米国
引用
ジャーナル: ACS Cent Sci / 年: 2025 タイトル: A Collagen Triple Helix without the Superhelical Twist. 著者: Mark A B Kreutzberger / Le Tracy Yu / Thi H Bui / Maria C Hancu / Michael D Purdy / Tomasz Osinski / Peter M Kasson / Edward H Egelman / Jeffrey D Hartgerink / 要旨: Collagens are ubiquitous in biology: functioning as the backbone of the extracellular matrix, forming the primary structural components of key immune system complexes, and fulfilling numerous other ...Collagens are ubiquitous in biology: functioning as the backbone of the extracellular matrix, forming the primary structural components of key immune system complexes, and fulfilling numerous other structural roles in a variety of systems. Despite this, there is limited understanding of how triple helices, the basic collagen structural units, pack into collagenous assemblies. Here we use a peptide self-assembly system to design collagenous assemblies based on the C1q collagen-like region. Using cryo-EM we solved a structure of one assembly to 3.5 Å resolution and built an atomic model. From this, we identify a triple helix conformation with no superhelical twist, starkly in contrast to the canonical right-handed triple helix. This nontwisting region allows for unique hydroxyproline stacking between adjacent triple helices and also results in the formation of an exposed cavity with rings of hydrophobic amino acids packed symmetrically. We find no precedent for such an arrangement of collagen triple helices and designed assemblies with substituted amino acids in various locations to probe key stabilizing amino acid interactions in the complex. The stability of these altered complexes behaves as predicted by our atomic model. Our findings, combined with the extremely limited experimental structural data on triple helix packing in the literature, suggest that collagen and collagen-like assemblies may adopt a far more varied conformational landscape than previously appreciated. We hypothesize that this is particularly likely in packed assemblies of triple helices, adjacent to the termini of these helices and at discontinuities in the required Xaa-Yaa-Gly repeating primary sequence, a discontinuity found in the majority of this class of proteins and in many collagen-associated diseases.
ダウンロード / ファイル: emd_45363.map.gz / 形式: CCP4 / 大きさ: 92.1 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
This is the primary map that should be view for interpretation of our atomic modeling results. Achieved after filtering, masking out the uninterpretable density and then sharpening with EM ready.
This is the map prior to sharpening by EMReady. Achieved by low pass filtering the initial map and then cutting out the density with a mask generated from preliminary model.