Table of Contents Appendix figure legends p. 2 Appendix Figure S1

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p. 2. Appendix Figure S1 - Analog-sensitive CDKL5 phosphorylates AMPH1 in vitro. p. 4. Appendix Figure S2 - Replicate comparison of MS1 peak areas. p. 5.
Table of Contents Appendix figure legends

p. 2

Appendix Figure S1 - Analog-sensitive CDKL5 phosphorylates AMPH1 in vitro.

p. 4

Appendix Figure S2 - Replicate comparison of MS1 peak areas.

p. 5

Appendix Figure S3 - MS1 precursor ion chromatograms.

p. 6

Appendix Figure S4 - ARHGEF2 and EB2 are efficiently phosphorylated by CDKL5 in vitro.

p. 7

Appendix Figure S5 - MAP1S LC S786/812D is not phosphomimetic.

p. 8

Appendix Figure S6 - IPSC pluripotency markers.

p. 9

1

Appendix Figure S1 - Analog-sensitive CDKL5 phosphorylates AMPH1 in vitro. A

CDKL5 gatekeeper residue identified by sequence alignment with kinase domains of NDR1

and MST3. Gatekeeper mutations are highlighted in bold. B

CDKL5 C152A rescue mutation was determined by sequence alignment with NDR1 S229A

rescue mutation. Both are at -1 of conserved DFG motif of the kinase domain. Rescue mutations are highlighted in bold. C

In vitro kinase assay showing that 50 ng (40 nM) AS-CDKL5 directly phosphorylates 300 ng

(130 nM) AMPH1 in 60 minutes incubation. Thio-P = anti-thiophosphate ester antibody.

Appendix Figure S2 – Replicate comparison of MS1 peak areas. A-C

Peak areas of precursor ion chromatograms are extracted after MS1 filtering for peaks picked

based on MS2 peptide identification in three independent experiments. Peaks for all three putative CDKL5 substrate peptides were found in experiment 1 (A), but only ARHGEF2 and EB2 peaks were present in experiment 2 (B) and 3 (C). Peak areas are averaged for multiple injections (n = 2 for experiment 1 and 2, n = 3 for experiment 3). Isotope dot product is depicted above the respective bars.

Appendix Figure S3 - MS1 precursor ion chromatograms. A-E

Precursor ion chromatograms extracted after MS1 filtering for peaks picked based on MS2

peptide identification in experiment 1. Black arrowheads point towards peaks for ARHGEF2 (A), EB2 double charged (B) and triple charged (C), and MAP1S double charged (D) and triple charged (E) precursor ions. Retention time and mass error are depicted above the respective peaks.

Appendix Figure S4 - ARHGEF2 and EB2 are efficiently phosphorylated by CDKL5 in vitro. A - D In vitro kinase assays showing efficient ARHGEF2 phosphorylation by CDKL5. 50 ng (40 nM) AS-CDKL5 phosphorylates 150 ng (50 nM) ARHGEF2 (A, B). In 60 minutes of incubation, 150 ng ARHGEF2 is phosphorylated by small amounts of CDKL5 (C, D). Quantification of phosphorylated ARHGEF2 is normalized to maximum intensity. E-H

In vitro kinase assays showing efficient EB2 phosphorylation by CDKL5. 50 ng (40 nM) AS-

CDKL5 phosphorylates 200 ng (170 nM) EB2 very rapidly (E, F). In 30 minutes of incubation, 200 ng

2

EB2 is phosphorylated by small amounts of CDKL5 (G, H). Quantification of phosphorylated ARHGEF2 is normalized to maximum intensity.

Appendix Figure S5 - MAP1S LC S786/812D is not phosphomimetic. A, B

Taxol-stabilised microtubule co-sedimentation assay with a 1:1 MT:MAP1S LC ratio shows a

higher percentage of soluble MAP1S LC (48 ± 5 %). MAP1S pS786 and pS812 are not restricted to the soluble or MT-bound fraction. Quantification of MAP1S phosphorylation is normalized for total protein level. Student’s t-test: n = 4 replicates. C

Taxol-stabilised microtubule co-sedimentation assay including MAP1S LC S786/812D.

MAP1S LC S786/812D in the soluble supernatant (s/n) fraction is reduced compared to WT MAP1S LC and therefore does not act like a phosphomimetic variant. D

COS-7 cell expressing HA-MAP1S LC S786/812D is shown with endogenous α-tubulin

staining. MAP1S LC localizes to microtubules and is not phosphomimetic. Scale bar is 20 μm.

Appendix Figure S6 - IPSC pluripotency markers. Representative images showing the expression of pluripotency markers OCT4 and TRA-1-60 in human CDKL5-mutant and control IPSCs. Scale bar is 100 µm.

3

Appendix Figure S1 A

B

C

Gatekeeper mutation CDKL5

Y L V F89A

NDR1

Y L

I M166A

E F L

MST3

W I

I M99I

E Y L

E F M

AMPH1

WT

CDKL5 KD

150 kD

Thio-P

100 kD 150 kD

Rescue mutation CDKL5 NDR1

K L C152A D F G K L S229A D F G

AS

Coomassie (AMPH1)

100 kD

4

AS 1 AS 2 KD 1

0

0.98

0.97

0.94

2

0.94

4

0.95

0.99

0.97

0

MAP1S 492.9155+++ KAPARPSSASATPR

0.99

6

0.99

8

0.96

Peak area (10^7)

0.92

0.89

0.5

precursor precursor [M+1] precursor [M+2]

1.00

0.97

2

0.98

5

1

0.99

MAP1S 738.8696++ KAPARPSSASATPR

4

0.97

EB2 904.9306++ SSPASKPGSTPSRPSSAK

1.5

AS 1 AS 2 KD 1

0

Peak area (10^8)

0.96

0.96

1

0

AS 1 AS 2 AS 3 AS 4 KD 1 KD 2 KD 3

0

0.77

0.5

2

0.99

6

C3

1.5 1

A5

EB2 603.6228+++ SSPASKPGSTPSRPSSAK

0.97

2

3

0.88

0.99

Peak area (10^7)

0.98

0.99

8

2.5

0.96

Peak area (10^7)

10

4

AS 1 AS 2 KD 1 KD 2

Peak area (10^7)

0.97

AS 1 AS 2 KD 1 KD 2 0.82

0

ARHGEF2 853.3827++ ERPTSAIYPSDSFR

AS 1 AS 2 KD 1

0

AS 1 AS 2 AS 3 AS 4 KD 1 KD 2 KD 3

Exp. 3

0.81

0.5

0.72

0.93

1

0.75

2 1.5

1

0

C2

0.93

0.94

2.5

2

EB2 904.9306++ SSPASKPGSTPSRPSSAK

AS 1 AS 2 AS 3 AS 4 KD 1 KD 2 KD 3

Peak area (10^7)

ARHGEF2 853.3827++ ERPTSAIYPSDSFR

C1

0.5

0.71

0.44

0.55

0.84

AS 1 AS 2 KD 1 KD 2

0

3

B3

1.5 1

A4

4

EB2 603.6228+++ SSPASKPGSTPSRPSSAK

0.99

0.96

4 2

0.97

0

0.99

B2

6

0.98

2

Peak area (10^7)

Peak area (10^6)

4

EB2 904.9306++ SSPASKPGSTPSRPSSAK

8

Exp. 2

6

AS 1 AS 2 KD 1

ARHGEF2 853.3827++ ERPTSAIYPSDSFR

B1

A3

AS 1 AS 2 KD 1

0

Exp. 1

8

Peak area (10^7)

5

10

0.97

0.96

1

Peak area (10^6)

A2

0.99

2 1.5

0.96

A1

Peak area (10^7)

Appendix Figure S2

EB2 603.6228+++ SSPASKPGSTPSRPSSAK

Appendix Figure S3 AS1 injection 1

A1

A2

ARHGEF2

B1

EB2

C1

EB2

D1

MAP1S

E1

MAP1S

AS1 injection 2

ERPTSAIYPSDSFR

B2

SSPASKPGSTPSRPSSAK

C2

SSPASKPGSTPSRPSSAK

D2

KAPARPSSASATPR

E2

KAPARPSSASATPR

AS2 injection 1

AS2 injection 2

A3

A4

precursor - 853.3827++

KD1 injection 1

A5

precursor [M+1] - 853.8842++

B3

B4

precursor - 904.9306++

B5

precursor [M+1] - 905.4320++

C3

C4

precursor - 603.6228+++

C5

precursor [M+1] - 603.9571+++

D3

D4

precursor - 738.8696++

D5

precursor [M+1] - 739.3710++

E3

E4

precursor - 492.9155+++

E5

precursor [M+1] - 493.2497+++

6

KD1 injection 2

A6

precursor [M+2] - 854.3855++

B6

precursor [M+2] - 905.9333++

C6

precursor [M+2] - 604.2913+++

D6

precursor [M+2] - 739.8722++

E6

precursor [M+2] - 493.5839+++

Appendix Figure S4 A

C

ARHGEF2 WT + AS-CDKL5 0

10 20 30 40 50 60 min

150 kD

Thio-P

100 kD

Coomassie (ARHGEF2)

10 20 35 50 ng Thio-P

100 kD

50 0 0

10

20

30

40

Time (min)

50

60

100 50 0 0

10

G

EB2 WT + AS-CDKL5 0

Coomassie (ARHGEF2)

150 kD

D

100

E

10 20 30 40 50 60 min

50 kD

Thio-P

20

30

CDKL5 (ng)

40

50

EB2 WT

CDKL5 0

2

5

10 20 35 50 ng

50 kD

Thio-P

37 kD

37 kD

Coomassie (EB2)

50 kD 37 kD

37 kD

H

100 50 0

Coomassie (EB2)

50 kD

pEB2 (%)

pEB2 (%)

5

150 kD

pARHGEF2 (%)

pARHGEF2 (%)

100 kD

F

2

100 kD

150 kD

B

ARHGEF2 WT

CDKL5 0

100 50 0

0

10

20

30

40

Time (min)

50

60

0

10

20

30

CDKL5 (ng)

7

40

50

B

pellet

25 kD

MAP1S LC

50 kD

Tubulin

0.0

pS786

pS812

input

S786/ 812D pellet

s/n

pellet

s/n

0.5

25 kD

MAP1S LC

50 kD

Tubulin

Tubulin

MAP1S LC

Tubulin / MAP1S LC

CDKL5 WT MAP1S LC S786/812D

D

1.0

S786/ 812A

WT input

MAP1S LC

n.s.

pellet

pS812

n.s.

1.5

s/n

25 kD

phospho / total MAP1S (a.u.)

25 kD

C

Soluble MAP1S LC MT-bound MAP1S LC

pS786

input

input

A

s/n

Appendix Figure S5

8

Appendix Figure S6 OCT4

TRA-1-60

human control

human CDKL5-mutant

DAPI

9

DAPI / OCT4 / TRA-1-60

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