A proximity-dependent biotinylation map of a human cell

Area of Science:

• Cell Biology
• Proteomics
• Molecular Biology

Background:

• Eukaryotic cells utilize compartmentalization to segregate biochemical processes.
• Traditional methods like microscopy and mass spectrometry have limitations in defining all intracellular compartments.
• Proximity-dependent biotinylation techniques offer an alternative for mapping cellular compartments in living cells.

Purpose of the Study:

• To create a comprehensive BioID-based map of a human cell.
• To define the intracellular locations of a large number of unique proteins.
• To discover proteins involved in mitochondrial homeostasis at the mitochondrial-endoplasmic reticulum interface.

Main Methods:

• Utilized proximity-dependent biotinylation (BioID) technique.
• Integrated 192 subcellular markers to map protein localization.
• Analyzed protein data in HEK293 cells.

Main Results:

• Successfully mapped the intracellular locations of 4,145 unique proteins.
• Achieved high specificity in protein localization predictions.
• Discovered novel proteins at the mitochondrial outer membrane-endoplasmic reticulum interface critical for mitochondrial homeostasis.

Conclusions:

• The developed BioID-based map provides unprecedented resolution of human cell proteomes.
• The findings reveal key proteins regulating mitochondrial homeostasis.
• Launched humancellmap.org as a community resource for BioID data analysis and interpretation.