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Digestion of the lambda cI repressor with various serine proteases and correlation with its three dimensional structure.

Abstract：

:Partial proteolysis of the lambda cI repressor has been carried out systematically with trypsin, chymotrypsin, elastase, endoproteinase Glu-C, kallikrein, and thrombin. The cleavage sites have been determined by (i) comparison of fragments produced and observed in SDS-polyacrylamide gel with known fragments and plots of distance migrated versus log (molecular weight of fragment), (ii) partial Edman sequencing of the stable C-terminal fragments to identify cleavage points, and (iii) electrospray mass spectrometry of fragments produced. Most cleavage points are found to occur in the region 86-137, saving some in the N-terminal domain observed for trypsin and Glu-C. Region 86-137 can be further subdivided into three regions 86-91, 114-121, and 128-137 prone to cleavage, with intermediate regions resistant to cleavage to all six proteases. These resistant regions show that much of the region 93-131 previously called a 'linker' is actually part of the C-domain as first proposed in all models from our laboratory. Region 92-114 includes the cleavage site Ala-Gly, which must be buried in the intact repressor. The observed cleavage points in region 114-137 can be used to judge the best among three previously proposed models since they differ from each other in the structure of region 93-131. Model 1j5g is adjudged to be better than model 1lwq (which is based on 1kca, a crystal structure) as susceptible residues are more exposed in the former and lack of cleavages at six sites is better explained. Likewise, the models 1j5g and 1lwq are compared with a recent crystal structure of fragment 101-229 in 2ho0 and another low resolution crystal structure in 3bdn.

journal_name

J Biomol Struct Dyn

journal_title

Journal of biomolecular structure & dynamics

authors

Pal A,Chattopadhyaya R

doi

10.1080/07391102.2008.10507249

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

339-54

issue

3

eissn

0739-1102

issn

1538-0254

pii

d=3031&c=4271&p=16878&do=detail

journal_volume

26

pub_type

杂志文章

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