[Structure-activity domain of elongation factor EF-2. Analysis of fragments of limited EF-2 hydrolysis, obtained using trypsin and elastase].
Limited hydrolysis of EF-2 with trypsin in mild conditions leads to cleavage at the N-terminal part of the protein, at the region of phosphorylation, at the Arg54 and Arg65 residues. The trypsinolysis product, fragment T1', containing Thr56 and Thr58, which are phosphorylated in EF-2, is also phosphorylated by EF-2-kinase at the same residues. In the phosphorylated EF-2, digestion by trypsin takes place only at Arg65, resulting in a reduction of the rate of hydrolysis in comparison with the native EF-2. Digestion of EF-2 with elastase results in the formation of two fragments E1 and E2 (60 and 40 kDa, respectively). Fragment E1 represents the N-terminal part of EF-2. It is resistant to the further action of elastase, is not cleaved by trypsin, and loses its capability for phosphorylation. Fragment E2, the C-end part of the molecule, is not resistant to the further action of elastase and retains its capability for ADP-ribosylation with the A fragment of diptheria toxin and NAD+. Electrophoretic analysis of EF-2 and its proteolytic fragments according to O'Farrell showed that the modification, resulting in the presence of two initial forms of EF-2, is located between the amino acid residues 66 and 506 of the polypeptide chain. In conclusion a possibility of studying the formation of partial functional activities within the framework of individual structure-functional domains using a set of N-terminal fragments of various length is discussed.
Motuz
L P
LP
Plotnikov
A N
AN
Korotkov
K V
KV
Alakhov
Iu B
IuB
D000246:Adenosine Diphosphate Ribose / Q000737:chemistry; D000595:Amino Acid Sequence; D006868:Hydrolysis; D008969:Molecular Sequence Data; D010196:Pancreatic Elastase / Q000737:chemistry*; D020652:Peptide Elongation Factor 2; D010445:Peptide Elongation Factors / Q000737:chemistry*; D010750:Phosphoproteins / Q000737:chemistry*; D010766:Phosphorylation; D013329:Structure-Activity Relationship; D014357:Trypsin / Q000737:chemistry*
D020652:Peptide Elongation Factor 2; D010445:Peptide Elongation Factors; D010750:Phosphoproteins; D000246:Adenosine Diphosphate Ribose; D010196:Pancreatic Elastase; D014357:Trypsin
Strukturno-funktsional'nye domeny faktora élongatsii EF-2. Analiz fragmentov ogranichennogo gidroliza EF-2, poluchennykh s pomoshch'iu tripsina i élastazy.