scholarly journals Delivery of a mucin domain enriched in cysteine residues strengthens the intestinal mucous barrier

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Valérie Gouyer ◽  
Laurent Dubuquoy ◽  
Catherine Robbe-Masselot ◽  
Christel Neut ◽  
Elisabeth Singer ◽  
...  
Keyword(s):  
Cysteine Residues ◽  
Mucous Barrier

scholarly journals Primary- and secondary-structural analysis of a unique prokaryotic metallothionein from a Synechococcus sp. cyanobacterium

1988 ◽  
Vol 251 (3) ◽  
pp. 691-699 ◽  
Author(s):  
R W Olafson ◽  
W D McCubbin ◽  
C M Kay
Keyword(s):  
Amino Acid ◽  
Metal Binding ◽  
Helical Structure ◽  
Basic Amino Acid ◽  
Cysteine Residues ◽  
Amino Acid Residues ◽  
C Terminus ◽  
Empirical Relations ◽  
Heavy Metal Binding ◽  
Synechococcus Sp

Biochemical and physiological studies of Synechococcus cyanobacteria have indicated the presence of a low-Mr heavy-metal-binding protein with marked similarity to eukaryotic metallothioneins (MTs). We report here the characterization of a Synechococcus prokaryotic MT isolated by gel-permeation and reverse-phase chromatography. The large number of variants of this molecule found during chromatographic separation could not be attributed to the presence of major isoproteins as assessed by amino acid analysis and amino acid sequencing of isoforms. Two of the latter were shown to have identical primary structures that differed substantially from the well-described eukaryotic MTs. In addition to six long-chain aliphatic residues, two aromatic residues were found adjacent to one another near the centre of the molecule, making this the most hydrophobic MT to be described. Other unusual features included a pair of histidine residues located in repeating Gly-His-Thr-Gly sequences near the C-terminus and a complete lack of association of hydroxylated residues with cysteine residues, as is commonly found in eukaryotes. Similarly, aside from a single lysine residue, no basic amino acid residues were found adjacent to cysteine residues in the sequence. Most importantly, sequence alignment analyses with mammalian, invertebrate and fungal MT sequences showed no statistically significant homology aside from the presence of Cys-Xaa-Cys structures common to all MTs. On the other hand, like other MTs, the prokaryotic molecule appears to be free of alpha-helical structure but has a considerable amount of beta-structure, as predicted by both c.d. measurements and the Chou & Fasman empirical relations. Considered together, these data suggested that some similarity between the metal-thiolate clusters of the prokaryote and eukaryote MTs may exist.

Antiviral and Antiproliferative Activities of Interferon-α1: The Role of Cysteine Residues

1986 ◽  
Vol 6 (6) ◽  
pp. 677-685 ◽  
Author(s):  
MANFRED W. BEILHARZ ◽  
IAN T. NISBET ◽  
MARTIN J. TYMMS ◽  
PAUL J. HERTZOG ◽  
ANTHONY W. LINNANE
Keyword(s):  
Cysteine Residues ◽  
Antiproliferative Activities

scholarly journals Oxidation of critical cysteine residues of type I adenylyl cyclase by o-iodosobenzoate or nitric oxide reversibly inhibits stimulation by calcium and calmodulin.

1994 ◽  
Vol 269 (10) ◽  
pp. 7290-7296
Author(s):  
R.J. Duhe ◽  
M.D. Nielsen ◽  
A.H. Dittman ◽  
E.C. Villacres ◽  
E.J. Choi ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Adenylyl Cyclase ◽  
Cysteine Residues ◽  
Type I
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