scholarly journals Cytochrome c-specific protein methylase III from Neurospora crassa

1977 ◽  
Vol 165 (1) ◽  
pp. 11-18 ◽  
Author(s):  
S Nochumson ◽  
E Durban ◽  
S Kim ◽  
W K Paik
Keyword(s):  
Amino Acid ◽  
Cytochrome C ◽  
Neurospora Crassa ◽  
Specific Protein ◽  
Methyl Groups ◽  
Horse Heart Cytochrome ◽  
Specific Amino Acid ◽  
Chymotryptic Peptide ◽  
Horse Heart Cytochrome C ◽  
Hydrolysis Of

A protein methylase III responsible for specifically methylating the cytochrome c in Neurospora crassa was partially characterized by using unmethylated horse heart cytochrome c as a substrate. This enzyme utilizes S-adenosyl-L-methionine as the methyl donor. An analysis of the distribution of [14C]methyl groups in the peptides obtained by chymotrypsin digestion of the enzymically methylated cytochrome c showed that all of the radioactivity could be recovered within a single peak after chromatography. This indicates that the enzyme methylates a specific amino acid sequence within cytochrome c. On hydrolysis of the radioactive chymotryptic peptide, Me-14C-labelled epsilon -N-mono-methyl-lysine, epsilon-N-dimethyl-lysine and epsilon-N-trimethyl-lysine were identified. The enzyme can easily be extracted from the N. crassa mycelial pads and was purified approx. 30-fold.

scholarly journals Enzyme-assisted semisynthesis of polypeptide active esters and their use

1988 ◽  
Vol 249 (1) ◽  
pp. 83-88 ◽  
Author(s):  
K Rose ◽  
C Herrero ◽  
A E I Proudfoot ◽  
R E Offord ◽  
C J A Wallace
Keyword(s):  
Amino Acid ◽  
Cytochrome C ◽  
Amino Acid Ester ◽  
Amino Group ◽  
Horse Heart Cytochrome ◽  
C Terminus ◽  
Active Ester ◽  
Chemical Coupling ◽  
Concentrated Solution ◽  
Horse Heart Cytochrome C

A method is described for the preparation of polypeptides activated uniquely at the C-terminus. The polypeptide is incubated in a concentrated solution of an amino acid active ester, the latter having its amino group free but adequately protected by protonation. The amino acid ester is coupled via its amino group to the C-terminus of the polypeptide by enzymic catalysis (reverse proteolysis). The resulting polypeptide C-terminal active ester is then isolated and coupled to a suitable amino component (generally a polypeptide) in a subsequent chemical coupling. The method appears to be generally applicable; fragments of horse heart cytochrome c, and porcine insulin, are used as examples. Two new analogues of cytochrome c have been prepared by using this method, with yields of up to 60% in the final coupling. Scope and limitations of the method are discussed.

Site-specific hydrolysis of horse heart cytochrome c and apocytochrome c promoted by palladium(II) complex

Polyhedron ◽  
1999 ◽  
Vol 18 (11) ◽  
pp. 1629-1633 ◽  
Author(s):  
Feng Qiao ◽  
Jianzhong Hu ◽  
Haizhong Zhu ◽  
Xuemei Luo ◽  
Longgen Zhu ◽  
...  
Keyword(s):  
Cytochrome C ◽  
Horse Heart Cytochrome ◽  
Site Specific ◽  
Apocytochrome C ◽  
Horse Heart Cytochrome C ◽  
Hydrolysis Of

Amino-Acid Sequence of Horse Heart Cytochrome C : The Complete Amino-acid Sequence

Nature ◽  
1961 ◽  
Vol 192 (4808) ◽  
pp. 1125-1127 ◽  
Author(s):  
E. MARGOLIASH ◽  
EMIL L. SMITH ◽  
GUNTHER KREIL ◽  
HANS TUPPY
Keyword(s):  
Amino Acid ◽  
Cytochrome C ◽  
Amino Acid Sequence ◽  
Horse Heart Cytochrome ◽  
Complete Amino Acid Sequence ◽  
Horse Heart Cytochrome C

scholarly journals The semisynthesis of fragments corresponding to residues 66-104 of horse heart cytochrome c

1979 ◽  
Vol 179 (1) ◽  
pp. 169-182 ◽  
Author(s):  
C J Wallace ◽  
R E Offord
Keyword(s):  
Biological Activity ◽  
Amino Acid ◽  
Cytochrome C ◽  
Amino Acid Sequences ◽  
Side Chain ◽  
Horse Heart Cytochrome ◽  
Natural Sequence ◽  
C Terminus ◽  
N Terminus ◽  
Horse Heart Cytochrome C

We describe the N epsilon-acetimidylation of horse heart cytochrome c with retention of biological activity, the cleavage of the modified protein by CNBr, the separation of the fragments, and their further side-chain protection. We describe the manipulation of the amino acid sequences of the fragments by stepwise semisynthetic methods. We have prepared fragments corresponding to residues 66-78 and 66-79 of the protein, as well as the [Asp66] analogue of fragment 66-79. We have prepared the natural sequence and the [o-fluoro-Phe82] analogue of the fragment corresponding to residues 81-104 of the protein, and the [N epsilon-trifluoroacetyl-Lys79], the [N epsilon-dinitrophenyl-Lys79] and the [S-acetamidomethyl-Cys79] analogues of fragment 79-104, and the [N epsilon-Cbz-Lys81] analogue of fragment 80-104. We have coupled back the fragments of natural sequence to form a semisynthetic fragment corresponding to residues 66-104 of the protein. Modified fragments were also coupled to give analogues of the 66-104-residue sequence. In every case the homoserine residue representing methionine-80 was removed from the C-terminus of the 66-80-residue fragment and replaced by methionine on the N-terminus of the 81-104 residue fragment during the preparation of the fragments for coupling. The semisynthetic fragments are ready for specific deprotection and further coupling. We have coupled one such fragment to the (1-65)-peptide to produce semisynthetic [Hse65]cytochrome c. The product has satisfactory characteristics on chemical analysis, and on assay of its biological activity.

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