In blood coagulation, the enzyme thrombin cleaves fibrinogen, sites for fibrin polymerization are revealed, and fibrin clot formation begins. Activated Factor XIII, a transglutaminase, is responsible for catalyzing the formation of covalent crosslinks between fibrin molecules and in fibrin-enzyme complexes. Thrombin activates Factor XIII by cleaving a peptide sequence that lies across the Factor XIII catalytic site. The thrust of this research project will be to examine in solution the structural features that govern the activation and substrate specificity of Factor XIII.
The specific aims are designed to prove the following hypotheses: 1) There is no obvious consensus sequence for defining the substrate specificity of Factor XIII for glutamine donating groups. The glutamine containing substrates are hypothesized to interact with the Factor XIII enzyme surface using similar bound conformations with defined flexible and/or solvent exposed regions. Peptides based on natural and synthetic substrates will be examined. 2) The Factor XIII activation peptide segment has components that resemble the fibrinogen Aalpha chain, the thrombin receptor, and PPACK, all of which interact with thrombin. The Factor XIII activation peptide segment is hypothesized to adopt a bound conformation that allows for the most effective interactions with the thrombin surface. An understanding of how unique amino acid positions within this segment participate in binding may lead to the design of Factor XIII enzymes whose degree of activation and optimal target site can be controlled. A model system for these studies is Factor XIII V34L, a common polymorphism that has been correlated with protection against myocardial infarction and is more susceptible to thrombin cleavage than the native sequence. To address these specific aims, a combination of kinetic studies, hydrogen/deuterium exchange followed by MALDI-TOF mass spectrometry, 1D proton line broadening NMR, 2D TOCSY, 2D transferred NOESY, and molecular modeling will be used. Understanding the molecular details of how Factor XIII is activated and how its substrate specificity is regulated is critical considering the role this enzyme plays in increasing the risk of heart disease, stroke, and arteriosclerosis.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL068440-02
Application #
6608053
Study Section
Hematology Subcommittee 2 (HEM)
Program Officer
Link, Rebecca P
Project Start
2002-07-08
Project End
2006-05-31
Budget Start
2003-06-01
Budget End
2004-05-31
Support Year
2
Fiscal Year
2003
Total Cost
$214,500
Indirect Cost
Name
University of Louisville
Department
Chemistry
Type
Schools of Arts and Sciences
DUNS #
057588857
City
Louisville
State
KY
Country
United States
Zip Code
40292
Hethershaw, E L; Adamson, P J; Smith, K A et al. (2018) The role of ?-barrels 1 and 2 in the enzymatic activity of factor XIII A-subunit. J Thromb Haemost 16:1391-1401
Billur, Ramya; Ban, David; Sabo, T Michael et al. (2017) Deciphering Conformational Changes Associated with the Maturation of Thrombin Anion Binding Exosite I. Biochemistry 56:6343-6354
Jadhav, Madhavi A; Goldsberry, Whitney N; Zink, Sara E et al. (2017) Screening cleavage of Factor XIII V34X Activation Peptides by thrombin mutants: A strategy for controlling fibrin architecture. Biochim Biophys Acta Proteins Proteom 1865:1246-1254
Mouapi, Kelly Njine; Bell, Jacob D; Smith, Kerrie A et al. (2016) Ranking reactive glutamines in the fibrinogen ?C region that are targeted by blood coagulant factor XIII. Blood 127:2241-8
Doiphode, Prakash G; Malovichko, Marina V; Mouapi, Kelly Njine et al. (2014) Evaluating factor XIII specificity for glutamine-containing substrates using a matrix-assisted laser desorption/ionization time-of-flight mass spectrometry assay. Anal Biochem 457:74-84
Malovichko, Marina V; Sabo, T Michael; Maurer, Muriel C (2013) Ligand binding to anion-binding exosites regulates conformational properties of thrombin. J Biol Chem 288:8667-78
Woofter, Ricky T; Maurer, Muriel C (2011) Role of calcium in the conformational dynamics of factor XIII activation examined by hydrogen-deuterium exchange coupled with MALDI-TOF MS. Arch Biochem Biophys 512:87-95
Jadhav, Madhavi A; Lucas, R Cory; Goldsberry, Whitney N et al. (2011) Design of Factor XIII V34X activation peptides to control ability to interact with thrombin mutants. Biochim Biophys Acta 1814:1955-63
Jadhav, Madhavi A; Isetti, Giulia; Trumbo, Toni A et al. (2010) Effects of introducing fibrinogen Aalpha character into the factor XIII activation peptide segment. Biochemistry 49:2918-24
Cleary, D B; Doiphode, P G; Sabo, T M et al. (2009) A non-reactive glutamine residue of alpha2-antiplasmin promotes interactions with the factor XIII active site region. J Thromb Haemost 7:1947-9

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