PMID- 28594323
OWN - NLM
STAT- In-Process
LR  - 20170611
IS  - 2050-084X (Electronic)
IS  - 2050-084X (Linking)
VI  - 6
DP  - 2017 Jun 8
TI  - Epistatic mutations in PUMA BH3 drive an alternate binding mode to potently and
      selectively inhibit anti-apoptotic Bfl-1.
LID - 10.7554/eLife.25541 [doi]
LID - e25541 [pii]
AB  - Overexpression of anti-apoptotic Bcl-2 family proteins contributes to cancer
      progression and confers resistance to chemotherapy. Small molecules that target
      Bcl-2 are used in the clinic to treat leukemia, but tight and selective
      inhibitors are not available for Bcl-2 paralog Bfl-1. Guided by computational
      analysis, we designed variants of the native BH3 motif PUMA that are > 150-fold
      selective for Bfl-1 binding. The designed peptides potently trigger disruption of
      the mitochondrial outer membrane in cells dependent on Bfl-1, but not in cells
      dependent on other anti-apoptotic homologs. High-resolution crystal structures
      show that designed peptide FS2 binds Bfl-1 in a shifted geometry, relative to
      PUMA and other binding partners, due to a set of epistatic mutations. FS2
      modified with an electrophile reacts with a cysteine near the peptide-binding
      groove to augment specificity. Designed Bfl-1 binders provide reagents for
      cellular profiling and leads for developing enhanced and cell-permeable peptide
      or small-molecule inhibitors.
FAU - Jenson, Justin M
AU  - Jenson JM
AUID- ORCID: http://orcid.org/0000-0003-1960-0447
AD  - Department of Biology, Massachusetts Institute of Technology, Cambridge, United
      States.
FAU - Ryan, Jeremy A
AU  - Ryan JA
AUID- ORCID: http://orcid.org/0000-0002-3327-1283
AD  - Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, United
      States.
FAU - Grant, Robert A
AU  - Grant RA
AD  - Department of Biology, Massachusetts Institute of Technology, Cambridge, United
      States.
FAU - Letai, Anthony
AU  - Letai A
AD  - Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, United
      States.
FAU - Keating, Amy E
AU  - Keating AE
AUID- ORCID: http://orcid.org/0000-0003-4074-8980
AD  - Department of Biology, Massachusetts Institute of Technology, Cambridge, United
      States.
AD  - Department of Biology, Department of Biological Engineering, Massachusetts
      Institute of Technology, Cambridge, United States.
LA  - eng
PT  - Journal Article
DEP - 20170608
PL  - England
TA  - Elife
JT  - eLife
JID - 101579614
PMC - PMC5464773
OTO - NOTNLM
OT  - apoptosis
OT  - binding specificity
OT  - biochemistry
OT  - biophysics
OT  - human
OT  - protein-protein interaction
OT  - structural biology
EDAT- 2017/06/09 06:00
MHDA- 2017/06/09 06:00
CRDT- 2017/06/09 06:00
PHST- 2017/01/30 00:00 [received]
PHST- 2017/05/16 00:00 [accepted]
PHST- 2017/06/09 06:00 [entrez]
PHST- 2017/06/09 06:00 [pubmed]
PHST- 2017/06/09 06:00 [medline]
AID - 10.7554/eLife.25541 [doi]
PST - epublish
SO  - Elife. 2017 Jun 8;6. doi: 10.7554/eLife.25541.