scholarly journals The evolutionary appearance of non-cyanogenic hydroxynitrile glucosides in theLotusgenus is accompanied by the substrate specialization of paralogous β-glucosidases resulting from a crucial amino acid substitution

2014 ◽  
Vol 79 (2) ◽  
pp. 299-311 ◽  
Author(s):  
Daniela Lai ◽  
Maher Abou Hachem ◽  
Fran Robson ◽  
Carl Erik Olsen ◽  
Trevor L. Wang ◽  
...  
Keyword(s):  
Amino Acid ◽  
Amino Acid Substitution ◽  
Substrate Specialization ◽  
Hydroxynitrile Glucosides

Hubsm: A Novel Amino Acid Substitution Matrix for Comparing Hub Proteins

2017 ◽  
Vol 7 (8) ◽  
pp. 212
Author(s):  
Renganayaki G. ◽  
Achuthsankar S. Nair
Keyword(s):  
Amino Acid ◽  
Amino Acid Substitution ◽  
Low Complexity ◽  
Database Search ◽  
Substitution Matrix ◽  
Compositional Bias ◽  
Sequence Alignments ◽  
Amino Acid Substitution Matrix ◽  
Alignment Algorithms ◽  
Hub Proteins

Sequence alignment algorithms and  database search methods use BLOSUM and PAM substitution matrices constructed from general proteins. These de facto matrices are not optimal to align sequences accurately, for the proteins with markedly different compositional bias in the amino acid.   In this work, a new amino acid substitution matrix is calculated for the disorder and low complexity rich region of Hub proteins, based on residue characteristics. Insights into the amino acid background frequencies and the substitution scores obtained from the Hubsm unveils the  residue substitution patterns which differs from commonly used scoring matrices .When comparing the Hub protein sequences for detecting homologs,  the use of this Hubsm matrix yields better results than PAM and BLOSUM matrices. Usage of Hubsm matrix can be optimal in database search and for the construction of more accurate sequence alignments of Hub proteins.

scholarly journals A large compressibility change of protein induced by a single amino acid substitution

1996 ◽  
Vol 5 (3) ◽  
pp. 542-545 ◽  
Author(s):  
Kunihiko Gekko ◽  
Youjiro Tamura ◽  
Eiji Ohmae ◽  
Hideyuki Hayashi ◽  
Hiroyuki Kagamiyama ◽  
...  
Keyword(s):  
Amino Acid ◽  
Amino Acid Substitution ◽  
Single Amino Acid Substitution ◽  
Single Amino Acid

Identification of a Functional Domain Within the Essential Core of Histone H3 That Is Required for Telomeric and HM Silencing in Saccharomyces cerevisiae

Genetics ◽  
2003 ◽  
Vol 163 (1) ◽  
pp. 447-452 ◽  
Author(s):  
Jeffrey S Thompson ◽  
Marilyn L Snow ◽  
Summer Giles ◽  
Leslie E McPherson ◽  
Michael Grunstein
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Amino Acid ◽  
Amino Acid Substitution ◽  
Histone H3 ◽  
Single Amino Acid ◽  
Functional Domain ◽  
Partial Loss ◽  
Histone Fold ◽  
Gal1 Promoter ◽  
Substitution Mutations

Abstract Fourteen novel single-amino-acid substitution mutations in histone H3 that disrupt telomeric silencing in Saccharomyces cerevisiae were identified, 10 of which are clustered within the α1 helix and L1 loop of the essential histone fold. Several of these mutations cause derepression of silent mating locus HML, and an additional subset cause partial loss of basal repression at the GAL1 promoter. Our results identify a new domain within the essential core of histone H3 that is required for heterochromatin-mediated silencing.

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