Product-conformation-driven ligation of peptides by V8 protease

Sonati Srinivasulu, A. Seetharama Acharya

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Organic co-solvent-induced secondary conformation of α17-40 of human hemoglobin facilitates the splicing of E30-R31 in a mixture of its complementary segments by V8 protease. The amino acid sequence of α17-40 has been conceptualized by the general structure FR1-EALER-FRII and the pentapeptide sequence EALER playing a major role in inducing the α-helical conformation. The primary structure of α17-40 has been engineered in multiple ways to perturb one, two, or all three regions and the influence of the organic co-solvent-induced conformation and the concomitant resistance of E30-R31 peptide bond to V8 protease digestion has been investigated. The central pentapeptide (EALER), referred to here as splicedon,3 appears to dictate a primary role in facilitating the splicing reaction. When the same flanking regions are used, (1) splicedons that carry amino acid residues of low α-helical potential, for example G at position 2 or 3 of the splicedon, generate a conformational trap of very low thermodynamic stability, giving an equilibrium yield of only 3%-5%; (2) splicedons with amino acid residues of good α-helical potential generate a conformational trap of medium thermodynamic stability and give an equilibrium yield of 20%-25%; (3) the splicedons with amino residues of good α-helical potential and also an amino acid that can generate an i, i + 4 side-chain carboxylate-guanidino (amino) interaction, a conformational trap of maximum thermodynamic stability is generated, giving an equilibrium yield of 45%-50%; and (4) the thermodynamic stability of the conformational trap of the spliced peptide is also influenced by the amino acid composition of the flanking regions. The V8 protease resistance of the spliced peptide bond is not a direct correlate of the amount of α-helical conformation induced into the product. The results of this study reflect the unique role of the splicedon in translating the organic co-solvent-induced product conformation as a site-specific stabilization of the spliced peptide bond. It is speculated that the splicedon with higher α-helical potential as compared to either one of the flanking regions achieves this by integrating its potential with that of the flanking region(s). Exchange of flanking regions with the products of other V8 protease-catalyzed splicing reactions will help to establish the general primary structural requirements of this class of splicing reactions and facilitate their application in modular construction of proteins.

Original languageEnglish (US)
Pages (from-to)1384-1392
Number of pages9
JournalProtein Science
Volume11
Issue number6
DOIs
StatePublished - 2002

Fingerprint

Thermodynamics
Ligation
Conformations
Amino Acids
Thermodynamic stability
Peptides
Modular construction
Digestion
Amino Acid Sequence
Hemoglobins
Stabilization
glutamyl endopeptidase
Proteins
Chemical analysis

Keywords

  • Conformational trap
  • Cosolvent
  • Flanking region
  • Reverse proteolysis
  • Semisynthesis
  • Splicedon

ASJC Scopus subject areas

  • Biochemistry

Cite this

Product-conformation-driven ligation of peptides by V8 protease. / Srinivasulu, Sonati; Seetharama Acharya, A.

In: Protein Science, Vol. 11, No. 6, 2002, p. 1384-1392.

Research output: Contribution to journalArticle

Srinivasulu, S & Seetharama Acharya, A 2002, 'Product-conformation-driven ligation of peptides by V8 protease', Protein Science, vol. 11, no. 6, pp. 1384-1392. https://doi.org/10.1110/ps.0201302
Srinivasulu, Sonati ; Seetharama Acharya, A. / Product-conformation-driven ligation of peptides by V8 protease. In: Protein Science. 2002 ; Vol. 11, No. 6. pp. 1384-1392.
@article{675fb8cd581a4a47bebc6cf1ec7fea84,
title = "Product-conformation-driven ligation of peptides by V8 protease",
abstract = "Organic co-solvent-induced secondary conformation of α17-40 of human hemoglobin facilitates the splicing of E30-R31 in a mixture of its complementary segments by V8 protease. The amino acid sequence of α17-40 has been conceptualized by the general structure FR1-EALER-FRII and the pentapeptide sequence EALER playing a major role in inducing the α-helical conformation. The primary structure of α17-40 has been engineered in multiple ways to perturb one, two, or all three regions and the influence of the organic co-solvent-induced conformation and the concomitant resistance of E30-R31 peptide bond to V8 protease digestion has been investigated. The central pentapeptide (EALER), referred to here as splicedon,3 appears to dictate a primary role in facilitating the splicing reaction. When the same flanking regions are used, (1) splicedons that carry amino acid residues of low α-helical potential, for example G at position 2 or 3 of the splicedon, generate a conformational trap of very low thermodynamic stability, giving an equilibrium yield of only 3{\%}-5{\%}; (2) splicedons with amino acid residues of good α-helical potential generate a conformational trap of medium thermodynamic stability and give an equilibrium yield of 20{\%}-25{\%}; (3) the splicedons with amino residues of good α-helical potential and also an amino acid that can generate an i, i + 4 side-chain carboxylate-guanidino (amino) interaction, a conformational trap of maximum thermodynamic stability is generated, giving an equilibrium yield of 45{\%}-50{\%}; and (4) the thermodynamic stability of the conformational trap of the spliced peptide is also influenced by the amino acid composition of the flanking regions. The V8 protease resistance of the spliced peptide bond is not a direct correlate of the amount of α-helical conformation induced into the product. The results of this study reflect the unique role of the splicedon in translating the organic co-solvent-induced product conformation as a site-specific stabilization of the spliced peptide bond. It is speculated that the splicedon with higher α-helical potential as compared to either one of the flanking regions achieves this by integrating its potential with that of the flanking region(s). Exchange of flanking regions with the products of other V8 protease-catalyzed splicing reactions will help to establish the general primary structural requirements of this class of splicing reactions and facilitate their application in modular construction of proteins.",
keywords = "Conformational trap, Cosolvent, Flanking region, Reverse proteolysis, Semisynthesis, Splicedon",
author = "Sonati Srinivasulu and {Seetharama Acharya}, A.",
year = "2002",
doi = "10.1110/ps.0201302",
language = "English (US)",
volume = "11",
pages = "1384--1392",
journal = "Protein Science",
issn = "0961-8368",
publisher = "Cold Spring Harbor Laboratory Press",
number = "6",

}

TY - JOUR

T1 - Product-conformation-driven ligation of peptides by V8 protease

AU - Srinivasulu, Sonati

AU - Seetharama Acharya, A.

PY - 2002

Y1 - 2002

N2 - Organic co-solvent-induced secondary conformation of α17-40 of human hemoglobin facilitates the splicing of E30-R31 in a mixture of its complementary segments by V8 protease. The amino acid sequence of α17-40 has been conceptualized by the general structure FR1-EALER-FRII and the pentapeptide sequence EALER playing a major role in inducing the α-helical conformation. The primary structure of α17-40 has been engineered in multiple ways to perturb one, two, or all three regions and the influence of the organic co-solvent-induced conformation and the concomitant resistance of E30-R31 peptide bond to V8 protease digestion has been investigated. The central pentapeptide (EALER), referred to here as splicedon,3 appears to dictate a primary role in facilitating the splicing reaction. When the same flanking regions are used, (1) splicedons that carry amino acid residues of low α-helical potential, for example G at position 2 or 3 of the splicedon, generate a conformational trap of very low thermodynamic stability, giving an equilibrium yield of only 3%-5%; (2) splicedons with amino acid residues of good α-helical potential generate a conformational trap of medium thermodynamic stability and give an equilibrium yield of 20%-25%; (3) the splicedons with amino residues of good α-helical potential and also an amino acid that can generate an i, i + 4 side-chain carboxylate-guanidino (amino) interaction, a conformational trap of maximum thermodynamic stability is generated, giving an equilibrium yield of 45%-50%; and (4) the thermodynamic stability of the conformational trap of the spliced peptide is also influenced by the amino acid composition of the flanking regions. The V8 protease resistance of the spliced peptide bond is not a direct correlate of the amount of α-helical conformation induced into the product. The results of this study reflect the unique role of the splicedon in translating the organic co-solvent-induced product conformation as a site-specific stabilization of the spliced peptide bond. It is speculated that the splicedon with higher α-helical potential as compared to either one of the flanking regions achieves this by integrating its potential with that of the flanking region(s). Exchange of flanking regions with the products of other V8 protease-catalyzed splicing reactions will help to establish the general primary structural requirements of this class of splicing reactions and facilitate their application in modular construction of proteins.

AB - Organic co-solvent-induced secondary conformation of α17-40 of human hemoglobin facilitates the splicing of E30-R31 in a mixture of its complementary segments by V8 protease. The amino acid sequence of α17-40 has been conceptualized by the general structure FR1-EALER-FRII and the pentapeptide sequence EALER playing a major role in inducing the α-helical conformation. The primary structure of α17-40 has been engineered in multiple ways to perturb one, two, or all three regions and the influence of the organic co-solvent-induced conformation and the concomitant resistance of E30-R31 peptide bond to V8 protease digestion has been investigated. The central pentapeptide (EALER), referred to here as splicedon,3 appears to dictate a primary role in facilitating the splicing reaction. When the same flanking regions are used, (1) splicedons that carry amino acid residues of low α-helical potential, for example G at position 2 or 3 of the splicedon, generate a conformational trap of very low thermodynamic stability, giving an equilibrium yield of only 3%-5%; (2) splicedons with amino acid residues of good α-helical potential generate a conformational trap of medium thermodynamic stability and give an equilibrium yield of 20%-25%; (3) the splicedons with amino residues of good α-helical potential and also an amino acid that can generate an i, i + 4 side-chain carboxylate-guanidino (amino) interaction, a conformational trap of maximum thermodynamic stability is generated, giving an equilibrium yield of 45%-50%; and (4) the thermodynamic stability of the conformational trap of the spliced peptide is also influenced by the amino acid composition of the flanking regions. The V8 protease resistance of the spliced peptide bond is not a direct correlate of the amount of α-helical conformation induced into the product. The results of this study reflect the unique role of the splicedon in translating the organic co-solvent-induced product conformation as a site-specific stabilization of the spliced peptide bond. It is speculated that the splicedon with higher α-helical potential as compared to either one of the flanking regions achieves this by integrating its potential with that of the flanking region(s). Exchange of flanking regions with the products of other V8 protease-catalyzed splicing reactions will help to establish the general primary structural requirements of this class of splicing reactions and facilitate their application in modular construction of proteins.

KW - Conformational trap

KW - Cosolvent

KW - Flanking region

KW - Reverse proteolysis

KW - Semisynthesis

KW - Splicedon

UR - http://www.scopus.com/inward/record.url?scp=0036111751&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036111751&partnerID=8YFLogxK

U2 - 10.1110/ps.0201302

DO - 10.1110/ps.0201302

M3 - Article

VL - 11

SP - 1384

EP - 1392

JO - Protein Science

JF - Protein Science

SN - 0961-8368

IS - 6

ER -