1. AtDi19. At1g56280 1 206aa 28 206aa 32 206aa 1 34 206aa 8 7 1 1 7 1 # PB1 domain-containing protein. At3g26510 1 196aa 1 # 3 152aa Heat shock protein 1. At4g14830 1 152aa 1 # 12 152aa Serine rich protein. At5g21940 1 264aa 1 # 2 248aa 53 1 254aa 56 1 258aa 59 1 264aa 63 1 264aa 107 1 Zn finger protein. At3g48360 1 364aa # 223 1 364aa 225 1 364aa 280 2 364aa 282 2 297aa AtToc33. At1g02280 1 297aa 1 # 3 264aa 1 1 NAD-dependent protein. At3g23820 1 460aa # 348 1 460aa 350 1 460aa 445 1 Alpha 1,2-mannosidase. At3g21160 1 572aa # 432 1 572aa 440 2 Figure S3 Summary of redundant prey clones recovered using AtCPK4 as bait. Dark line indicates full-length open reading frame. Length is indicated in amino acids (aa). Open lines indicate recovered prey clones and coordinates of open reading frame. Number (#) to the right of each line indicates the number of times each prey clone was recovered during screens.

2. Auxin transport protein (Pin7). At1g23080 1 619aa # 601aa 397 1 591aa 397 1 SEC5a. At1g76850 1 1090aa # 606aa 332 1 602aa 332 1 170aa Endo/exonuclease. At5g43210 1 170aa 1 # 2 Unknown protein. At5g55660 1 579aa # 242 2 242aa Ribosomal protein L7. At2g01250 1 242aa 1 # 1 134aa 1 1 242aa 10 1 Unknown protein. At3g42800 1 341aa # 205aa 1 1 299aa 108 1 315aa 108 1 Figure S3, continued

3. 297aa Cytochrome c oxidase assembly protein. At1g02410 1 287aa 51 300aa Chloroplast thylakoid formation 1. At2g20890 1 300aa 126 150aa Glutaredoxin-like protein. At1g03850 1 150aa 1 609aa Amino acid acetyltransferase. At2g22910 1 609aa 529 509aa Beta-ketoacyl-CoA synthetase. At2g26640 1 509aa 414 236aa Unknown protein. At2g36420 1 439aa 6 Unknown protein. At3g11960 1 1379aa 1242 530aa Calcium-binding EF hand family protein. At3g20290 1 545aa 265 691aa ABC transporter. At3g21090 1 691aa 529 198aa Heat shock protein 2. At3g22530 1 198aa 31 411-417aa Fructose-bisphosphatase precursor. At3g54050 1 417aa 371aa PB1 domain-containing protein 2. At4g32070 1 811aa 103 450-461aa Unknown protein. At5g03040 1 461aa ATP-dependent Clp protease. At5g50920 1 929aa 920-929aa 244aa 60S ribosomal protein L7. At3g13580 1 244aa 1 642aa RNA polymerase beta subunit-1 (rpoC1) 1 680aa 343 Figure S4 Summary of single-hit prey clones recovered using AtCPK4 as bait. Dark line indicates full-length open reading frame. Length is indicated in amino acids (aa). Open lines indicate recovered prey clones and coordinates of open reading frame.

4. Figure S5 Summary of redundant prey clones recovered using AtCPK11 as bait. Dark line indicates full-length open reading frame. Length is indicated in amino acids (aa). Open lines indicate recovered prey clones and coordinates of open reading frame. Number (#) to the right of each line indicates the number of times each prey clone was recovered during screens.

5. Figure S6 Summary of single-hit prey clones recovered using AtCPK11 as bait. Dark line indicates full-length open reading frame. Length is indicated in amino acids (aa). Open lines indicate recovered prey clones and coordinates of open reading frame.