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[ccp4bb]: Problems with SCALA



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Hi all,

	I have recently collected data from crystals containing 90 Se-Met in ASU 
from a protein forming an hexamer in Space Group P21. Data were collected 
at ESRF with a CCD ADSC Q210 detector at 2.5A resolution.
Spots looked very good and a complete data set was collected at the SE-Peak 
Wavelength.
I used MOSFLM for indexing and everything looked pretty good.
But when i started SCALA everyting went WRONG !

I don't understand....

Scaling failed and my I/SIGMA after SCALA (even if i don't scale) are very 
low (about 4-5) in all of the resolution zones !!!!
In input, my MTZ file contains reflexions with I/SIGMA > 40, but after 
SCALA the MTZ files does not contain any reflexion with I/SIGMA more than 8 
!! Even if i don't reject anything !!!

Of course my Rsyms are very high !

Here is a part of my SCALA log :

    N 1/d^2 Dmin(A) Rfac  Rfull   Rcum  Ranom  Nanom    Av_I   SIGMA 
I/sigma  sd Mn(I)/sd Nmeas  Nref  Ncent FRCBIAS  Nbias

   1 0.0160  7.91 
0.130  0.104  0.130  0.111   2365    1357.   305.5   4.4   120. 
24.4   15493   2539   178  -0.005   5848
   2 0.0320  5.59 
0.128  0.115  0.129  0.113   4565     865.   184.5   4.7    90. 
20.7   31356   4778   211  -0.009  12360
   3 0.0480  4.56 
0.119  0.109  0.123  0.085   5949    1774.   384.3   4.6   163. 
24.0   40331   6154   205   0.011  15656
   4 0.0640  3.95 
0.121  0.112  0.122  0.081   7056    1863.   389.8   4.8   176. 
23.6   48489   7265   207   0.010  19107
   5 0.0800  3.54 
0.128  0.111  0.124  0.083   8008    1342.   277.6   4.8   153. 
20.1   55806   8213   207  -0.002  22647
   6 0.0960  3.23 
0.134  0.119  0.126  0.087   8889    1041.   221.1   4.7   148. 
17.0   62204   9099   210   0.004  25574
   7 0.1120  2.99 
0.151  0.128  0.128  0.101   9650     644.   149.6   4.3   133. 
12.9   67699   9853   204   0.001  28037
   8 0.1280  2.80 
0.178  0.148  0.132  0.112  10405     424.   115.5   3.7   129.  9.7 
72920  10617   213   0.002  30262
   9 0.1440  2.64 
0.215  0.179  0.136  0.127  11101     304.   101.6   3.0   133.  7.5 
77706  11309   210  -0.010  32402
  10 0.1600  2.50 
0.258  0.218  0.141  0.148  11522     241.    99.9   2.4   140.  5.6 
70613  11580   199  -0.019  26198


  Overall:        0.141  0.125  0.141  0.095  79510     857.   223.8   3.8 
  140. 14.5  542617  81407  2044   0.002 218091
                  Rfac  Rfull   Rcum  Ranom  Nanom    Av_I   SIGMA 
I/sigma  sd Mn(I)/sd Nmeas  Nref  Ncent FRCBIAS  Nbias


N 1/resol^2 Dmin    Nmeas    Nref  Ncent   %poss Cm%poss Mlplcty AnomCmpl 
AnomFrc  Rmeas  Rmeas0  (Rsym)    PCV     PCV0   $$
  $$
    1  0.016    7.91    15722    2605    193    97.9    97.9     6.0 
96.2    96.9   0.158   0.184   0.130   0.182   0.224
    2  0.032    5.59    31487    4787    213   100.0    99.3     6.6 
99.8    99.8   0.153   0.183   0.128   0.175   0.222
    3  0.048    4.56    40547    6172    211   100.0    99.6     6.6 
99.8    99.8   0.143   0.157   0.119   0.165   0.192
    4  0.064    3.95    48676    7277    210   100.0    99.7     6.7 
99.8    99.8   0.145   0.156   0.121   0.167   0.192
    5  0.080    3.54    55929    8219    209   100.0    99.8     6.8 
100.0   100.0   0.152   0.163   0.128   0.176   0.199
    6  0.096    3.23    62312    9104    211   100.0    99.9     6.8 
100.0   100.0   0.159   0.171   0.134   0.185   0.210
    7  0.112    2.99    67806    9859    207   100.0    99.9     6.9 
100.0   100.0   0.179   0.194   0.151   0.212   0.242
    8  0.128    2.80    73020   10623    216   100.0    99.9     6.9 
100.0   100.0   0.211   0.227   0.178   0.254   0.286
    9  0.144    2.64    77819   11314    211   100.0    99.9     6.9 
100.0   100.0   0.255   0.272   0.215   0.314   0.351
   10  0.160    2.50    71464   11823    205    99.1    99.8     6.0 
98.3    99.2   0.314   0.328   0.258   0.395   0.436

            Overall    544782   81783   2086    99.8    99.8     6.7 
99.6    99.7   0.168   0.183   0.141   0.198   0.227
                        Nmeas    Nref  Ncent   %poss Cm%poss Mlplcty 
AnomCmpl AnomFrc  Rmeas  Rmeas0  (Rsym)    PCV     PCV0

Were does it come from ? Could the very high anomalous signal be a problem ?

Thanx to help me.

Thomas BERTRAND
Laboratoire d'Enzymologie et Biochimie Structurales
L.E.B.S CNRS
Gif-sur-Yvette FRANCE.
bertrand@lebs.cnrs-gif.fr