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Nature, Feb 20 2025, | https://doi.org/10.1038/s41586-025-08782-w
Structural dynamics of human fatty acid synthase in the condensing cycle
Wooyoung Choi 1 †, Chengmin Li 1 †, Yifei Chen 2 3, Yongqiang Wang 2, Yifan Cheng 4 5 *
1Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, CA, USA.
2Howard Hughes Medical Institute, University of California San Francisco, San Francisco, CA, USA.
3Biophysics Graduate Program, University of California San Francisco, San Francisco, CA, USA.
4Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, CA, USA.
5Howard Hughes Medical Institute, University of California San Francisco, San Francisco, CA, USA.
2Howard Hughes Medical Institute, University of California San Francisco, San Francisco, CA, USA.
3Biophysics Graduate Program, University of California San Francisco, San Francisco, CA, USA.
4Department of Biochemistry and Biophysics, University of California San Francisco, San Francisco, CA, USA.
5Howard Hughes Medical Institute, University of California San Francisco, San Francisco, CA, USA.
†These authors contributed equally
*Corresponding author: correspondence to Yifan Cheng
*Corresponding author: correspondence to Yifan Cheng
Abstract
Long chain fatty acids are the building blocks of fat in human bodies. In mammals, fatty acid synthase (FASN) contains multiple enzymatic domains to catalyze all chemical reactions needed for de novo fatty acid synthesis1. While the chemical reactions carried out by these enzymatic domains are well defined, how the dimeric FASN with an open architecture continuously catalyzes such reactions to synthesize a complete fatty acid remains elusive. Here, using a strategy of tagging and purifying endogenous FASN in HEK293 for single particle cryogenic electron microscopy studies, we characterized the structural dynamics of endogenous human FASN. We captured the conformational snapshots of various functional substates in the condensing cycle and developed a procedure to analyze particle distribution landscape of FASN with different orientations between its condensing and modifying wings. Together, we reveal that FASN function does not require large rotational motion between its two major functional domains during the condensing cycle, and that the catalytic reactions in condensing cycle carried out by two monomers are unsynchronized. Our data thus provide a new composite view of FASN dynamics during the fatty acid synthesis condensing cycle.
논문정보
- Research article
- 2025년 02월 (BRIC 등록일 2025-02-24)
- 국외 연구진
- 생명과학 > 구조생물 및 생물물리학
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