HEADER GROWTH FACTOR 08-OCT-93 1POS TITLE CRYSTAL STRUCTURE OF A NOVEL DISULFIDE-LINKED "TREFOIL" MOTIF FOUND TITLE 2 IN A LARGE FAMILY OF PUTATIVE GROWTH FACTORS COMPND MOL_ID: 1; COMPND 2 MOLECULE: PORCINE PANCREATIC SPASMOLYTIC POLYPEPTIDE; COMPND 3 CHAIN: A, B; COMPND 4 ENGINEERED: YES; EXPDTA X-RAY DIFFRACTION REMARK 2 RESOLUTION. 2.60 ANGSTORMS DBREF 1POS A 2 106 UNP P01359 TFF2_PIG 23 127 MODRES 1POS PCA A 1 GLU PYROGLUTAMIC ACID SEQRES 1 A 53 GLU LYS PRO ALA ALA CYS ARG CYS SER ARG GLN ASP PRO SEQRES 2 A 53 LYS ASN ARG VAL ASN CYS GLY PHE PRO GLY ILE THR SER SEQRES 3 A 53 ASP GLN CYS PHE THR SER GLY CYS CYS PHE ASP SER GLN SEQRES 4 A 53 VAL PRO GLY VAL PRO TRP CYS PHE LYS PRO LEU PRO ALA SEQRES 5 A 53 GLN ATOM 1 CA PCA A 1 83.339 28.789 29.151 1.00 37.50 ATOM 2 CA LYS A 2 82.507 25.124 29.874 1.00 29.61 ATOM 3 CA PRO A 3 79.182 23.339 29.741 1.00 25.66 ATOM 4 CA ALA A 4 78.543 21.615 33.030 1.00 14.09 ATOM 5 CA ALA A 5 78.782 17.899 32.421 1.00 16.12 ATOM 6 CA CYS A 6 75.047 17.244 32.222 1.00 17.77 ATOM 7 CA ARG A 7 74.776 19.422 29.158 1.00 10.12 ATOM 8 CA CYS A 8 77.348 17.126 27.509 1.00 12.04 ATOM 9 CA SER A 9 76.760 13.962 29.380 1.00 17.02 ATOM 10 CA ARG A 10 73.068 13.748 28.425 1.00 23.53 ATOM 11 CA GLN A 11 72.997 13.957 24.614 1.00 20.60 ATOM 12 CA ASP A 12 73.094 10.740 22.597 1.00 26.36 ATOM 13 CA PRO A 13 76.394 10.398 20.698 1.00 27.31 ATOM 14 CA LYS A 14 74.494 9.987 17.397 1.00 26.92 ATOM 15 CA ASN A 15 72.972 13.387 17.960 1.00 26.11 ATOM 16 CA ARG A 16 76.054 15.378 18.697 1.00 19.70 ATOM 17 CA VAL A 17 76.410 18.490 16.617 1.00 18.23 ATOM 18 CA ASN A 18 80.020 19.254 15.767 1.00 25.36 ATOM 19 CA CYS A 19 81.538 22.345 17.414 1.00 19.69 ATOM 20 CA GLY A 20 84.783 24.200 16.765 1.00 24.38 ATOM 21 CA PHE A 21 87.185 23.855 13.797 1.00 27.69 ATOM 22 CA PRO A 22 88.771 20.507 13.046 1.00 32.67 ATOM 23 CA GLY A 23 91.736 19.450 15.216 1.00 29.19 ATOM 24 CA ILE A 24 90.751 21.827 18.015 1.00 18.67 ATOM 25 CA THR A 25 92.237 20.604 21.305 1.00 16.53 ATOM 26 CA SER A 26 90.133 19.617 24.289 1.00 16.08 ATOM 27 CA ASP A 27 90.893 22.861 26.009 1.00 24.87 ATOM 28 CA GLN A 28 89.898 25.018 23.007 1.00 22.81 ATOM 29 CA CYS A 29 86.699 23.061 22.554 1.00 18.67 ATOM 30 CA PHE A 30 85.655 23.371 26.241 1.00 13.61 ATOM 31 CA THR A 31 86.618 27.000 26.644 1.00 22.60 ATOM 32 CA SER A 32 84.867 28.105 23.513 1.00 22.24 ATOM 33 CA GLY A 33 81.789 26.760 25.296 1.00 17.87 ATOM 34 CA CYS A 34 81.386 23.231 23.948 1.00 9.62 ATOM 35 CA CYS A 35 81.814 19.642 25.053 1.00 12.16 ATOM 36 CA PHE A 36 84.914 17.606 24.376 1.00 14.05 ATOM 37 CA ASP A 37 84.599 13.843 24.817 1.00 8.85 ATOM 38 CA SER A 38 87.111 11.392 23.348 1.00 14.07 ATOM 39 CA GLN A 39 85.704 8.049 24.456 1.00 17.64 ATOM 40 CA VAL A 40 83.090 7.395 21.773 1.00 12.01 ATOM 41 CA PRO A 41 84.051 6.555 18.162 1.00 18.44 ATOM 42 CA GLY A 42 82.276 7.816 15.129 1.00 25.31 ATOM 43 CA VAL A 43 80.865 11.022 16.508 1.00 14.45 ATOM 44 CA PRO A 44 82.022 14.567 17.069 1.00 12.56 ATOM 45 CA TRP A 45 84.516 14.653 19.927 1.00 9.34 ATOM 46 CA CYS A 46 83.853 18.381 20.211 1.00 9.36 ATOM 47 CA PHE A 47 80.102 19.115 20.201 1.00 12.89 ATOM 48 CA LYS A 48 77.459 21.676 21.142 1.00 14.13 ATOM 49 CA PRO A 49 75.903 21.334 24.603 1.00 13.70 ATOM 50 CA LEU A 50 72.224 20.748 25.558 1.00 8.83 ATOM 51 CA PRO A 51 70.771 24.157 26.429 1.00 17.22 ATOM 52 CA ALA A 52 71.057 25.260 30.022 1.00 26.86 ATOM 53 CA GLN A 53 68.476 25.176 32.734 1.00 35.11 TER