(A) iBAQ plot showing MS-enrichment of FBW7 and ...

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Peptidyl-prolyl cis-trans isomerase FKBP8. Chaperon. FKBP4. Peptidyl-prolyl cis-trans isomerase FKBP4. Chaperon. PSMA2. Proteasome subunit alpha type-2.
A

B 10

s

ol

ntr

o hC

s

7

W

B hF

USP9X

log iBAQ FBW7 IP 6 8

FBW7α Actin

FBW7

C

USP9X

MG132 Flag-FBW7β

shControl

− +

+ +

shUSP9x

− +

+ +

USP9X

4

Flag-FBW7β

4

6 8 log iBAQ control IP

10 Actin

Supplementary Figure 1. (A) iBAQ plot showing MS-enrichment of FBW7 and interaction partners over a control IgG. (B) Western blots for indicated proteins in cells transfected with indicated shRNAs. (C) Western blots for indicated proteins in cells co-transfected with Flag-FBW7β and indicated shRNAs.

Ubi-c-JUN

260 140

IP: HA/ HA-peptide Elution Flag-M2 IP on pooled sequentially eluted HA-ubiquitin complexes 3x wash

9X

US P

SH

AM

2

TU BA

UM

100 75

Ubi-Crest Assay on beads bound HA-ubiquitylated FBW7 α−K48: WB

50 40 Flag

α-Flag: WB

US P

HA-Ubiquitin & Flag-FBW7 overexpression in HCT116

USP9X

IP: HA WB: Flag

No

DU B

+ + +

Ubi-Flag-FBW7α

− + +

Western blotting for K48 specific linkage

K48-Ubi-FBW7α

GST-USP9X Flag-c-Jun HA-Ub

IN 1

C

B

O

A

Stripped/reprobed

INPUT

Supplementary Figure 2. USP9X cleaves K48-linked polyubiquitin chains on FBW7. (A) Recombinant USP9X does not affect polyubiquitination of c-JUN in an in vitro deubiquitylation reaction. (B) Schematic for experiment in C. (C) Ubiquitin chain restriction (UbiCRest) experiment with indicated deubiquitinases: USP2 (promiscuous), OTUBAIN1 (K48-linked), and AMSH (K63-linked).

l tro #4 #3 U9 hU9 h s s

on

C sh

USP9x Cyclin E c-Myc c-Jun Actin HCT116

Supplementary Figure 3. Accumulation of SCF(FBW7) substrates in cells transfected with USP9X-shRNA compared to a non-targeting control.

A

B MCM6

+/+

BrdU

BrdU+ cells/colonic crypt

9

Usp9x *

ΔG

6 3 0

Usp9x

ΔG

Usp9x

ΔG

Usp9x

+/+

Usp9x

Usp9x+/+

Usp9x

Chromogranin

+/+

+/+

+/+

Alkaline phosphatase

F

Relative mRNA expression (normalized to Actin)

Olfm4 ISH

Usp9x

E

D

Usp9x

C

Usp9x+/+

2

Usp9x

1.5

ΔG

*

1.0

0

x

p9

Us

w7

Fb

Usp9x

Usp9x

ΔG

ΔG

Usp9x

ΔG

0.5

Supplementary Figure 4. (A) IHC sections stained for proliferating cells (MCM6) from the intestine of indicated mice. Scale bar = 50 μm. (B) BrdU staining for proliferating cells in colonic crypts from indicated mice, quantification shown in right panel. Scale bar = 100 μm, n = 3–4 mice/group. (C) In situ hybridization for Olfm4 (stem cells) on the sections from the intestine of indicated mice. Scale bar = 100 μm. (D and E) IHC for enterocytes (Alkaline phosphatase) and enteroendocrine cells (Chromogranin) in gut from indicated mice. Scale bars = 100 μm. (F) qRT-PCR analysis showing mRNA levels of indicated genes normalised to actin and represented as fold change over control, in isolated crypts from Usp9x+/+ (wildtype) and Usp9xΔG gut, n = 5–8 mice/group.

A

B 12 BrdU+ cells/crypt

Goblet cells/villus

6 4 2 0

-

/+

ΔG

/+

8 6 4 2 0

ΔG

yc Jun c-M c-

Usp9x

10

ΔG

U

+

+/

x

9 sp

e icl DBZ

h Ve

ΔG

Usp9x

Supplementary Figure 5. (A) Average goblet cell number per villus from indicated mice. (B) Average BrdU+ cell number per crypt from indicated mice.

A

B 150

Usp9x ΔG Usp9x

130 110 90 70 50

p