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A rapid and precise method of measuring Kendrew‐model coordinates with theodolites
Author(s) -
Lebioda L.,
Hatada M. H.,
Tulinsky A.
Publication year - 1983
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889883010365
Subject(s) - theodolite , cartesian coordinate system , right ascension , geodesy , orthogonal coordinates , chemistry , mathematics , physics , geometry , geology , declination , astronomy
The Kendrew‐model coordinates of KDPG aldolase have been measured with the use of two theodolites which are improved versions of a conventional surveyor's transit. The four angular measurements are converted to Cartesian coordinates and a minimum‐error estimate with a minicomputer interfaced to the theodolites. The positions of 1677 atoms of the asymmetric unit of KDPG aldolase were measured by two of the authors in four working days or at the rate of about 60 atoms h −1 . The standard deviations of the bond distances and angles of the model obtained were ± 0.04 Å and about 7°, respectively. The mathematics of the various conversions are presented.