I'm getting lots of broken bonds when I attempt to generate random structures using the random.inp script attached, as indicated in the log file (abbreviated). These of course persist in subsequent sa runs. Pls. advise. Thanks. David

Attachment: random.inp
Description: Binary data

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\f0\fs24 \cf0 X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR>X-PLOR> EVALUATE: symbol $INIT_T set to    1000.00     (real)\
X-PLOR> EVALUATE: symbol $TOL set to    1.00000     (real)\
X-PLOR>X-PLOR>PARRDR>PARRDR> ASSFIL: file /usr/share/xplor-nih-2.18/toppar/dnarnapar.cornish opened.\
 PARRDR>remark  file dnarnapar.cornish \
 PARRDR>remark   geometric energy function parameters for distance geometry and \
 PARRDR>remark   simulated annealing. \
 PARRDR>remark \
 PARRDR>remark  history: 05/30/01 \
 PARRDR>remark \
 PARRDR>remark  derived from parallhdg.dna \
 PARRDR>remark \
 PARRDR> \
 PARRDR> \
 PARRDR>set echo off end \
 EVALUATE: symbol $KBOND set to    1000.00     (real)\
 EVALUATE: symbol $KANGLE set to    500.000     (real)\
 EVALUATE: symbol $KIMPROPER set to    500.000     (real)\
 PARRDR>end \
 X-PLOR> \
 X-PLOR>\{====>\} \
 X-PLOR>structure @sl2.psf end                     \{*Read the structure file.*\} \
 ASSFIL: file /home/giedroc/structure_dg/sl2.psf opened.\
 STRUcture>PSF \
 REMARKS FILENAME="sl2.psf"\
 REMARKS  file dnarnapar.cornish\
 REMARKS   geometric energy function parameters for distance geometry and\
 REMARKS   simulated annealing.\
 REMARKS\
 REMARKS  history: 05/30/01\
 REMARKS\
 REMARKS  derived from parallhdg.dna\
 REMARKS\
 REMARKS DATE:11-Jul-06  10:14:07       created by user: [unknown]\
 XPLOR: current counts (number in parenthesis is maximum)\
 NATOM=        506(MAXA=         800)  NBOND=        544(MAXB=         800)\
 NTHETA=       973(MAXT=        1600)  NGRP=         163(MAXGRP=       200)\
 NPHI=         460(MAXP=         800)  NIMPHI=       328(MAXIMP=       400)  \
 NDON=          47(MAXPAD=       200)  NACC=         133(MAXPAD=       200)\
 NNB=           48(MAXNB=        100) \
 STRUcture> end                     \{*Read the structure file.*\} \
 X-PLOR> \
 X-PLOR>noe \
 NOE>\{====>\} \
 NOE>   nres=3000             \{*Estimate greater than the actual number of NOEs.*\} \
 NOE: allocating space for    3000 restraints.\
 NOE>   class all \
 NOE>\{====>\} \
 NOE>   @030206_noe_all_rev.tbl \
 ASSFIL: file /home/giedroc/structure_dg/030206_noe_all_rev.tbl opened.\
 NOE>assign (residue 42 and name H1') (residue 42 and name H8) 4.0 1.0 1.0 \
 SELRPN:      1 atoms have been selected out of    506\
 SELRPN:      1 atoms have been selected out of    506\
\
ETC. (noes and h-bonding constraints read in fine)\
\
X-PLOR>\{====>\} evaluate ($end_count=100)                  \{* Number of structures. *\} \
 X-PLOR> \
 X-PLOR>evaluate ($count = 0) \
 X-PLOR>while ($count < $end_count ) loop main \
 X-PLOR>    evaluate ($count=$count+1) \
 X-PLOR> \
 X-PLOR>                                         \{* Generate a starting structure. *\} \
 X-PLOR>    vector do (x = (random()-0.5)*20) (all) \
 X-PLOR>    vector do (y = (random()-0.5)*20) (all) \
 X-PLOR>    vector do (z = (random()-0.5)*20) (all) \
 X-PLOR> \
 X-PLOR>    vector do (fbeta=10) (all)      \{*Friction coefficient for MD heatbath.*\} \
 X-PLOR>    vector do (mass=100) (all)              \{*Uniform heavy masses to speed*\} \
 X-PLOR>                                            \{*molecular dynamics.          *\} \
 X-PLOR> \
 X-PLOR>    parameter nbonds \
 NBDSET>         atom cutnb 100 tolerance 45 repel=1.2 \
 NBDSET>         rexp=2 irexp=2 rcon=1.0 nbxmod 4 \
 NBDSET>    end end \
 X-PLOR> \
 X-PLOR>    flags exclude * include bonds angle impr vdw noe cdih  harm end \
 X-PLOR> \
 X-PLOR>    evaluate ($knoe = 0.5) \
 X-PLOR> \
 X-PLOR>    evaluate ($kbon = 0.00005  )                 \{* Bonds.                 *\} \
 X-PLOR>    evaluate ($kang = 0.00005  )                 \{* Angles.                *\} \
 X-PLOR>    evaluate ($kimp = 0.0  )                     \{* Impropers.             *\} \
 X-PLOR>    evaluate ($kvdw = 0.1)                       \{* Vdw.                   *\} \
 X-PLOR>    constraints \
 CONS>        interaction (not name ca) (all) \
 CONS>        weights bond $kbon angl $kang impr $kimp vdw 0 elec 0 end \
 CONS>        interaction (name ca) (name ca) \
 CONS>        weights bond $kbon angl $kang impr $kimp vdw $kvdw end \
 CONS>    end \
 X-PLOR> \
 X-PLOR> \
 X-PLOR>    \{* ======================================== High temperature dynamics. *\} \
 X-PLOR> \
 X-PLOR>    vector do (vx = maxwell($init_t)) (all) \
 X-PLOR>    vector do (vy = maxwell($init_t)) (all) \
 X-PLOR>    vector do (vz = maxwell($init_t)) (all) \
 X-PLOR> \
 X-PLOR>    evaluate ($timestep = 0.04) \
 X-PLOR>    evaluate ($nstep = 100) \
 X-PLOR>    evaluate ($endtime = $nstep*.002) \
 X-PLOR> \
 X-PLOR>    while ($kbon < 0.01) loop stage1 \
 X-PLOR> \
 X-PLOR>            evaluate ($kbon = min(0.25, $kbon * 1.25)) \
 X-PLOR>            evaluate ($kang = $kbon) \
 X-PLOR>            evaluate ($kimp = 0) \
 X-PLOR>	 \
 X-PLOR>            noe scale * $knoe end \
 X-PLOR>            restraints dihed scale 0. end \
 X-PLOR>            constraints \
 CONS>                interaction (not name ca) (all) \
 CONS>                weights bond $kbon angl $kang impr $kimp vdw 0 elec 0 end \
 CONS>                interaction (name ca) (name ca) \
 CONS>                weights bond $kbon angl $kang impr $kimp vdw $kvdw end \
 CONS>            end \
 X-PLOR>	    	 \
 X-PLOR>!            dynamics  verlet \
 X-PLOR>!                  nstep=$nstep   timestep=$timestep   iasvel=current \
 X-PLOR>!                  tcoupling=true tbath=$init_t  nprint=50  iprfrq=0 \
 X-PLOR>!            end	 \
 X-PLOR> \
 X-PLOR>             dynamics internal \
 Internal Dynamics>!                   itype=pc6 \
 Internal Dynamics>                   itype=verlet \
 Internal Dynamics>                   etol=$tol \
 Internal Dynamics>                   tbath=$init_t \
 Internal Dynamics>                   response=20 \
 Internal Dynamics>                   response=5 \
 Internal Dynamics>                   nstep=$nstep \
 Internal Dynamics>                   endtime=$endtime \
 Internal Dynamics>                   timestep=$timestep \
 Internal Dynamics>             end \
AT_Build::buildNode: cycle link found between atoms 22 GUA  42   C5   and 12 GUA  42   C4  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 24 GUA  42   C8   and 11 GUA  42   N9  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 30 GUA  42   C3'  and 6 GUA  42   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 55 ADE  43   C5   and 46 ADE  43   C4  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 57 ADE  43   C8   and 45 ADE  43   N9  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 63 ADE  43   C3'  and 40 ADE  43   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 79 URI  44   C6   and 78 URI  44   N1  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 93 URI  44   C3'  and 73 URI  44   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 109 CYT  45   C6   and 108 CYT  45   N1  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 124 CYT  45   C3'  and 103 CYT  45   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 140 URI  46   C6   and 139 URI  46   N1  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 154 URI  46   C3'  and 134 URI  46   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 170 CYT  47   C6   and 169 CYT  47   N1  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 185 CYT  47   C3'  and 164 CYT  47   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 201 URI  48   C6   and 200 URI  48   N1  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 215 URI  48   C3'  and 195 URI  48   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 231 URI  49   C6   and 230 URI  49   N1  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 245 URI  49   C3'  and 225 URI  49   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 271 GUA  50   C5   and 261 GUA  50   C4  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 273 GUA  50   C8   and 260 GUA  50   N9  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 279 GUA  50   C3'  and 255 GUA  50   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 295 URI  51   C6   and 294 URI  51   N1  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 309 URI  51   C3'  and 289 URI  51   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 334 ADE  52   C5   and 325 ADE  52   C4  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 336 ADE  52   C8   and 324 ADE  52   N9  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 342 ADE  52   C3'  and 319 ADE  52   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 368 GUA  53   C5   and 358 GUA  53   C4  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 370 GUA  53   C8   and 357 GUA  53   N9  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 376 GUA  53   C3'  and 352 GUA  53   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 401 ADE  54   C5   and 392 ADE  54   C4  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 403 ADE  54   C8   and 391 ADE  54   N9  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 409 ADE  54   C3'  and 386 ADE  54   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 425 URI  55   C6   and 424 URI  55   N1  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 439 URI  55   C3'  and 419 URI  55   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 455 CYT  56   C6   and 454 CYT  56   N1  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 470 CYT  56   C3'  and 449 CYT  56   C4' \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 495 ADE  57   C5   and 486 ADE  57   C4  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 497 ADE  57   C8   and 485 ADE  57   N9  \
	removing bond.\
AT_Build::buildNode: cycle link found between atoms 503 ADE  57   C3'  and 480 ADE  57   C4' \
	removing bond.\
 -- VERLET ------ step=      0 --- timestep=      0.04 --- energy evals=    1 --\
 | E(kin)+E(poten)=25756.96       E(kin)=1510.462       temperature=1001.448   |\
 | Etotal =24246.495  grad(E)=15.435     E(BOND)=5622.961   E(ANGL)=37.131     |\
 | E(IMPR)=0.000      E(VDW )=0.000      E(HARM)=0.000      E(CDIH)=0.000      |\
 | E(NOE )=18586.403                                                           |\
 -------------------------------------------------------------------------------\
 -- VERLET ------ step=      1 --- timestep=      0.04 --- energy evals=    1 --\
 | E(kin)+E(poten)=25756.96       E(kin)=1510.462       temperature=1001.448   |\
 | Etotal =24246.495  grad(E)=15.435     E(BOND)=5622.961   E(ANGL)=37.131     |\
 | E(IMPR)=0.000      E(VDW )=0.000      E(HARM)=0.000      E(CDIH)=0.000      |\
 | E(NOE )=18586.403                                                           |\
 -------------------------------------------------------------------------------\
 -- VERLET ------ step=      2 --- timestep=      0.04 --- energy evals=    1 --\
 | E(kin)+E(poten)=26217.44       E(kin)=4353.501       temperature=2886.405   |\
 | Etotal =21863.943  grad(E)=14.153     E(BOND)=5550.841   E(ANGL)=37.150     |\
 | E(IMPR)=0.000      E(VDW )=0.000      E(HARM)=0.000      E(CDIH)=0.000      |\
 | E(NOE )=16275.952                                                           |\
 -------------------------------------------------------------------------------\
 -- VERLET ------ step=      3 --- timestep=      0.04 --- energy evals=    1 --\
 | E(kin)+E(poten)=26308.83       E(kin)=8340.118       temperature=5529.563   |\
 | Etotal =17968.716  grad(E)=11.881     E(BOND)=5417.063   E(ANGL)=37.256     |\
 | E(IMPR)=0.000      E(VDW )=0.000      E(HARM)=0.000      E(CDIH)=0.000      |\
 | E(NOE )=12514.397                                                           |\
 -------------------------------------------------------------------------------\
 -- VERLET ------ step=      4 --- timestep=      0.04 --- energy evals=    1 --\
 | E(kin)+E(poten)=26237.32       E(kin)=12511.2        temperature=8295.019   |\
 | Etotal =13726.125  grad(E)=9.041      E(BOND)=5238.013   E(ANGL)=37.433     |\
 | E(IMPR)=0.000      E(VDW )=0.000      E(HARM)=0.000      E(CDIH)=0.000      |\
 | E(NOE )=8450.678                                                            |\
 -------------------------------------------------------------------------------\
 -- VERLET ------ step=      5 --- timestep=      0.04 --- energy evals=    1 --\
 | E(kin)+E(poten)=25870.47       E(kin)=15671.3        temperature=10390.19   |\
 | Etotal =10199.176  grad(E)=6.310      E(BOND)=5031.144   E(ANGL)=37.692     |\
 | E(IMPR)=0.000      E(VDW )=0.000      E(HARM)=0.000      E(CDIH)=0.000      |\
 | E(NOE )=5130.339                                                            |\
 -------------------------------------------------------------------------------\
 X-PLOR>	 \
 X-PLOR>    end loop stage1 \
 X-PLOR>    while ($kbon < 0.01) loop stage1 \
 X-PLOR> \
 X-PLOR>            evaluate ($kbon = min(0.25, $kbon * 1.25)) \
 X-PLOR>            evaluate ($kang = $kbon) \
 X-PLOR>            evaluate ($kimp = 0) \
 X-PLOR>	 \
 X-PLOR>            noe scale * $knoe end \
 X-PLOR>            restraints dihed scale 0. end \
 X-PLOR>            constraints \
 CONS>                interaction (not name ca) (all) \
 CONS>                weights bond $kbon angl $kang impr $kimp vdw 0 elec 0 end \
 CONS>                interaction (name ca) (name ca) \
 CONS>                weights bond $kbon angl $kang impr $kimp vdw $kvdw end \
 CONS>            end \
}
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