Evidence map›Paper›PMID 40140412›Full record

ArticleNature communications2025

Cryo-EM structure of the BLOC-3 complex provides insights into the pathogenesis of Hermansky-Pudlak syndrome.

Xin Yong, Guowen Jia, Qin Yang, Chunzhuang Zhou, Sitao Zhang, Huaqing Deng, Daniel D Billadeau, Zhaoming Su, Da Jia

Abstract read
In one paragraph

Article in Nature communications, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.

0numbers the graph read from it
0cells of the map it votes in
6citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

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Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

6 citing papers in PubMed.

  1. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Xin Yong *Key Laboratory of Birth Defects and Related Diseases of Women and Children, Department of Paediatrics, West China Second University Hospital, State Key Laboratory of Biotherapy and Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China.
Guowen Jia *State Key Laboratory of Biotherapy, Department of Geriatrics and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China.ORCID http://orcid.org/0000-0002-6507-6204
Qin Yang *Key Laboratory of Birth Defects and Related Diseases of Women and Children, Department of Paediatrics, West China Second University Hospital, State Key Laboratory of Biotherapy and Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China.
Chunzhuang Zhou *Key Laboratory of Birth Defects and Related Diseases of Women and Children, Department of Paediatrics, West China Second University Hospital, State Key Laboratory of Biotherapy and Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China.
Sitao ZhangKey Laboratory of Birth Defects and Related Diseases of Women and Children, Department of Paediatrics, West China Second University Hospital, State Key Laboratory of Biotherapy and Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China.
Huaqing DengKey Laboratory of Birth Defects and Related Diseases of Women and Children, Department of Paediatrics, West China Second University Hospital, State Key Laboratory of Biotherapy and Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China.
Daniel D BilladeauDivision of Oncology Research and Schulze Center for Novel Therapeutics, Mayo Clinic, Rochester, USA.ORCID http://orcid.org/0000-0002-2296-9547
Zhaoming SuState Key Laboratory of Biotherapy, Department of Geriatrics and National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu, China. zsulab2019@gmail.com.
Da JiaKey Laboratory of Birth Defects and Related Diseases of Women and Children, Department of Paediatrics, West China Second University Hospital, State Key Laboratory of Biotherapy and Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China. JiaDa@scu.edu.cn.ORCID http://orcid.org/0000-0002-2205-1998

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Biogenesis of lysosome-related organelle complex-3 (BLOC-3) is pivotal in vesicle trafficking and has been linked to Hermansky-Pudlak syndrome (HPS). Despite its importance, the structure and molecular function of BLOC-3 remains elusive. Here, we report the Cryo-EM structure of human BLOC-3 at 3.2 Å resolution. The BLOC-3 complex consists of one copy of HPS1 and HPS4, which tightly associate with each other via their longin domains (LD1 and LD3). The unique four-helical bundle (4HB) domain of HPS1 is involved in stabilizing its LD1 and LD2 domains. Moreover, we identify interactions between BLOC-3 and the small GTPases RAB32/38 and RAB9A, which are essential for lysosome-related organelle biogenesis. Functional assays using zebrafish models confirm the significance of BLOC-3 assembly and its interaction with RAB9A during melanosome biogenesis. Most importantly, our structural information provides an accurate prediction for clinical variants associated with HPS. In summary, our study provides a comprehensive understanding of the molecular architecture and functional roles of BLOC-3, shedding light on HPS pathogenesis.

Indexed as

Carrier ProteinsHermanski-Pudlak SyndromeAnimalsCryoelectron MicroscopyGuanine Nucleotide Exchange FactorsHumansMelanosomesMembrane ProteinsModels, MolecularProtein BindingProtein Domainsrab GTP-Binding ProteinsZebrafishBLOC1S3 protein, humanCarrier ProteinsGuanine Nucleotide Exchange FactorsHPS1 protein, humanHPS4 protein, humanMembrane ProteinsRAB38 protein, humanrab GTP-Binding Proteins

Identifiers

PMID40140412
PMCPMC11947305

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.