Awful
Matt is the worse professor I have ever had. It is like we already know the material! He through notes impossibly fast . You will get little to no partial credit. Kiss your GPA good bye. He will destroy it.
University of Wisconsin River Falls - Chemistry
Ph.D.
Organic Chemistry
The Lindsley Lab
Chemical Biology Association of Students Executive Board
Chemical Biology Certificate Program
Vanderbilt Institute for Chemical Biology Symposium Planning Committee
American Chemical Society
Vanderbilt University
B.S.
Biology
Phi Beta Kappa Honor Society
Mortar Board Honor Society
Alpha Epsilon Delta Honor Society
Manresa Orientation Team (Freshman Orientation)
Teacher's Assistant-Chemistry 105
Learning Assistance Center Supplemental Instructor and Tutor
Intramural (floor hockey
softball
volleyball)
Community Action Day Site Leader
South Asian Society Dance Team
Alternative Breaks-Service Trips to Baltimore and Tucson
Speaker at the First Year Student Retreat
Certificate in College Teaching
Vanderbilt University
Certificate in Chemical Biology
Vanderbilt University
Keri A. Tallman
Michelle D. Armstrong
David S. Myers
Hyekyung P. Cho
Thomas P. Mathews
Yun Xiang
Sarah A. Scott
Journal of Biological Chemistry
Phosphatidic acid (PA) is a lipid second messenger located at the intersection of several lipid metabolism and cell signaling events including membrane trafficking
survival
and proliferation. Generation of signaling PA has long been primarily attributed to the activation of phospholipase D (PLD). PLD catalyzes the hydrolysis of phosphatidylcholine into PA. A variety of both receptor-tyrosine kinase and G-protein-coupled receptor stimulations have been shown to lead to PLD activation and PA generation. This study focuses on profiling the PA pool upon P2Y6 receptor signaling manipulation to determine the major PA producing enzymes. Here we show that PLD
although highly active
is not responsible for the majority of stable PA being produced upon UDP stimulation of the P2Y6 receptor and that PA levels are tightly regulated. By following PA flux in the cell we show that PLD is involved in an initial increase in PA upon receptor stimulation; however
when PLD is blocked
the cell compensates by increasing PA production from other sources. We further delineate the P2Y6 signaling pathway showing that phospholipase Cβ3 (PLCβ3)
PLCδ1
DGKζ and PLD are all downstream of receptor activation. We also show that DGKζ is a novel negative regulator of PLD activity in this system that occurs through an inhibitory mechanism with PKCα. These results further define the downstream events resulting in PA production in the P2Y6 receptor signaling pathway.
Regulation of Phospholipase D activity and phosphatidic acid production downstream of the Purinergic (P2Y6) receptor
Development of dual PLD1/2 and PLD2 selective inhibitors from a common 1
8-triazaspiro[4.5]decane core: discovery of ML298 and ML299 that decrease invasive migration in U87-MG glioblastoma cells
H. Alex Brown
Ryan Morrison
J Scott Daniels
Paul G Thomas
Thomas H Oguin III
Kyle A Brown
Sarah A Scott
An iterative parallel synthesis effort identified a PLD2 selective inhibitor
ML298 (PLD1 IC50 > 20 000 nM
PLD2 IC50 = 355 nM) and a dual PLD1/2 inhibitor
ML299 (PLD1 IC50 = 6 nM
PLD2 IC50 = 20 nM). SAR studies revealAn iterative parallel synthesis effort identified a PLD2 selective inhibitor
ML298 (PLD1 IC50 > 20 000 nM
PLD2 IC50 = 355 nM) and a dual PLD1/2 inhibitor
ML299 (PLD1 IC50 = 6 nM
PLD2 IC50 = 20 nM). SAR studies revealed that a small structural change (incorporation of a methyl group) increased PLD1 activity within this classically PLD2-preferring core and that the effect was enantiospecific. Both probes decreased invasive migration in U87-MG glioblastoma cells.ed that a small structural change (incorporation of a methyl group) increased PLD1 activity within this classically PLD2-preferring core and that the effect was enantiospecific. Both probes decreased invasive migration in U87-MG glioblastoma cells.
Development of dual PLD1/2 and PLD2 selective inhibitors from a common 1
8-triazaspiro[4.5]decane core: discovery of ML298 and ML299 that decrease invasive migration in U87-MG glioblastoma cells
In this Letter
we describe a novel three-step
one-pot procedure for the enantioselective synthesis of N-benzyl protected morpholines and orthogonally N
N′-protected piperazines with chiral alkyl groups installed at the C2 position of each heterocyclic core via organocatalysis. This methodology allows for the rapid preparation of functionalized morpholines and piperazines that are not readily accessible through any other chemistry in good to excellent % ee (55–98% ee).
Enantioselective synthesis of C2-functionalized
N-protected morpholines and orthogonally N
N’-protected piperazines via organocatalysis
A short
high yielding protocol has been developed for the enantioselective and general synthesis of C2-functionalized
benzyl protected morpholines and orthogonally N
N′-protected piperazines from a common intermediate.
A General
Enantioselective Synthesis of Protected Morpholines and Piperazines
Gary A. Sulikowski
A short
high-yielding protocol involving the enantioselective α-chlorination of aldehydes has been developed for the enantioselective synthesis of C2-functionalized aziridines and N-alkyl terminal azetidines from a common intermediate. This methodology allows for the rapid preparation of functionalized aziridines in 50–73% overall yields and 88–94% ee
and azetidines in 22–32% overall yields and 84–92% ee. Moreover
we developed a scalable and cost-effective route to the key organocatalyst (54% overall yield
>95% dr).
A General
Enantioselective Synthesis of N-Alkyl Terminal Aziridines and C2-Functionalized Azetidines via Organocatalysis
O'Reilly
Nashville State Community College
University of Wisconsin-Madison
Vanderbilt University
University of Wisconsin-River Falls
Xavier University
- taught 3 study groups/week\n- study groups in general chemistry during my first year and organic chemistry in my second year
Xavier University
University of Wisconsin-Madison
Madison
Wisconsin
See Arnold O. Beckman Postdoctoral Fellow description above.
Postdoctoral Research Associate
- taught 2 semesters of general chemistry lecture and laboratory\n- class sizes were around 30 students\n- designed the syllabus
grading scales
tests
and homework assignments
Adjunct Professor
Greater Nashville Area
TN
Nashville State Community College
River Falls
WI
Teach chemistry in the classroom and research in the laboratory.
Assistant Professor
University of Wisconsin-River Falls
Madison
Wisconsin
I am one of two people in charge of a seminar series\n- organize monthly speakers that either present on current research or career development skills\n- the seminars are sponsored by Sigma-Aldrich
which provides lunch to those who attend
Co-Director
Postdoctoral Seminar Series
University of Wisconsin-Madison
Madison
Wisconsin
I perform chemical biology research in the Blackwell Laboratory at the University of Wisconsin-Madison. \n\n- I synthesize small molecules to explore their activity as quorum sensing inhibitors\n- I perform assays to evaluate the activity of various compounds at LuxR-type receptors in Gram-negative bacteria\n- I use site directed mutagenesis involving PCR
cloning
and transformations to evaluate how structural components of LuxR-type receptors relate to their ligand binding properties
Arnold O. Beckman Postdoctoral Fellow
University of Wisconsin-Madison
Department of Chemistry\nLaboratory of Craig W. Lindsley\nDissertation Title: Application of Organocatalysis to the Synthesis of Chiral Morpholines
Piperazines
Aziridines
Azetidines
B-Fluoroamines
and y-fluoroamines; Discovery of Selective Phospholipase D Inhibitors with Optimized in vivo Properties\n\n- applied enamine organocatalysis to develop general methods of synthesizing chiral pharmaceutically relevant heterocycles\n- effectively implemented modern medicinal chemistry methods while developing selective inhibitors of phospholipase D\n- collaborated with the laboratories of H. Alex Brown and Paul G. Thomas\n- utilized microwave assisted synthesis protocols
automated flash column chromatography
HPLC
LC-MS
and NMR techniques for compound synthesis
purification
and characterization\n- taught undergraduate level recitation for sections of 20-30 students\n- substituted taught for Prof. Michelle Sulikowski during her summer organic courses with class sizes of greater than 60 students\n- mentored various undergraduate students
and taught synthetic techniques to junior graduate students
Graduate Research Assistant
Greater Nashville Area
TN
Vanderbilt University
- involved in training and payroll for supplemental instructors
Student Leader
Supplemental Instruction
Cincinnati
Ohio Area
Xavier University
- planned and coordinated career development
social events
and seminars for graduate students and postdocs\n- engaged with over 80 research groups that are part of the Vanderbilt Institute of Chemical Biology\n- organized two annual Vanderbilt Institute of Chemical Biology Symposia that featured oral and poster presentations from over 70 graduate students and postdocs and an oral presentation from a non-Vanderbilt keynote speaker
Secretary and Executive Board Member
Chemical Biology Association of Students
Greater Nashville Area
TN
Vanderbilt University
Microsoft Office
Chemistry
Word
Biochemistry
Microsoft Word
Life Sciences
HPLC
Research
Organic Chemistry
PCR
Spectroscopy
Data Analysis
PowerPoint
Molecular Biology
Lunch
Science
UV/Vis
Mass Spectrometry
NMR
Cell Culture
Name Reactions for Carbocyclic Ring Formations
Richard J. Mullins
John Wiley and Sons
Inc.
We wrote a chapter in this book about the 'Houben-Hoesch Reaction.'
Name Reactions for Carbocyclic Ring Formations
H. Alex Brown
Sarah A. Scott
This Letter describes the on-going SAR efforts based on two scaffolds
a PLD1-biased piperidinyl benzimidazolone and a PLD2-biased piperidinyl triazaspirone
with the goal of enhancing PLD inhibitory potency and isoform selectivity. Here
we found that addition of an α-methyl moiety within the PLD2-biased piperidinyl triazaspirone scaffold abolished PLD2 preference
while the incorporation of substituents onto the piperidine moiety of the PLD1-biased piperidinyl benzimidazolone
or replacement with a bioisosteric [3.3.0] core
generally retained PLD1 preference
but at diminished significance. The SAR uncovered within these two allosteric PLD inhibitor series further highlights the inherent challenges of developing isoform selective PLD inhibitors.
Further evaluation of novel structural modifications to scaffolds that engender PLD isoform selective inhibition.
In this Letter
we describe a short
high yielding protocol for the enantioselective (87–96% ee) and general synthesis of β-fluoroamines and previously difficult to access γ-fluoroamines from commercial aldehydes via organocatalysis.
A general
enantioselective synthesis of β and γ-fluoroamines
Helen E. Blackwell
Many common bacterial pathogens utilize quorum sensing to coordinate group behaviors and initiate virulence at high cell densities. The use of small molecules to block quorum sensing provides a means of abrogating pathogenic phenotypes
but many known quorum sensing modulators have limitations
including hydrolytic instability and displaying non-monotonic dose curves (indicative of additional targets and/or modes of action). To address these issues
we undertook a structure-based scaffold-hopping approach to develop new chemical modulators of the LasR quorum sensing receptor in Pseudomonas aeruginosa. We combined components from a triphenyl derivative known to strongly agonize LasR with chemical moieties known for LasR antagonism and generated potent LasR antagonists that are hydrolytically stable across a range of pH values. Additionally
many of these antagonists do not exhibit non-monotonic dose effects
delivering probes that inhibit LasR across a wider range of assay conditions relative to known lactone-based ligands.
Structure-Based Design and Biological Evaluation of Triphenyl Scaffold-Based Hybrid Compounds as Hydrolytically Stable Modulators of a LuxR-Type Quorum Sensing Receptor
H. Alex Brown
Richard C. Larock
Dai-II Jung
Chul-Hee Cho
Kyle A Brown
Cierra T. Spencer
Sarah A. Scott
ACS Chemical Biology
Phospholipase D (PLD) hydrolyses cellular lipids to produce the important lipid second messenger phosphatidic acid. A PLD enzyme expressed by Pseudomonas aeruginosa (PldA) has been shown to be important in bacterial infection
and NAPE-PLD has emerged as being key in the synthesis of endocannabinoids. In order to better understand the biology and therapeutic potential of these less explored PLD enzymes
small molecule tools are required. Selective estrogen receptor modulators (SERMs) have been previously shown to inhibit mammalian PLD (PLD1 and PLD2). By targeted screening of a library of SERM analogues
additional parallel synthesis
and evaluation in multiple PLD assays
we discovered a novel desketoraloxifene-based scaffold that inhibited not only the two mammalian PLDs but also structurally divergent PldA and NAPE-PLD. This finding represents an important first step toward the development of small molecules possessing universal inhibition of divergent PLD enzymes to advance the field.
Discovery of desketoraloxifene analogues as inhibitors of mammalian
Pseudomonas aeruginosa
and NAPE phospholipase D enzymes.
Chemical strategies to block quorum sensing (QS) could provide a route to attenuate virulence in bacterial pathogens. Considerable research has focused on this approach in Pseudomonas aeruginosa
which uses the LuxR-type receptor LasR to regulate much of its QS network. Non-native ligands that antagonize LasR have been developed
yet we have little understanding of the mode by which these compounds interact with LasR and alter its function
as the receptor is unstable in their presence. Herein
we report an approach to circumvent this challenge through the study of a series of synthetic LasR agonists with varying levels of potency. Structural investigations of these ligands with the LasR ligand-binding domain reveal that certain agonists can enforce a conformation that deviates from that observed for other
often more potent agonists. These results
when combined with cell-based and biophysical analyses
suggest a functional model for LasR that could guide future ligand design.
Structural and Biochemical Studies of Non-native Agonists of the LasR Quorum-Sensing Receptor Reveal an L3 Loop “Out” Conformation for LasR
H. Alex Brown
J. Scott Daniels
Ryan D. Morrison
Paul G. Thomas
Sarah A. Scott
Thomas H. Oguin III
Further chemical optimization of the halopemide-derived family of dual phospholipase D1/2 (PLD1/2) inhibitors afforded ML395 (VU0468809)
a potent
>80-fold PLD2 selective allosteric inhibitor (cellular PLD1
IC50>30 000 nm; cellular PLD2
IC50=360 nm). Moreover
ML395 possesses an attractive in vitro DMPK profile
improved physiochemical properties
ancillary pharmacology (Eurofins Panel) cleaner than any other reported PLD inhibitor
and has been found to possess interesting activity as an antiviral agent in cellular assays against a range of influenza strains (H1
H3
H5 and H7).
Discovery of a highly selective PLD2 inhibitor (ML395): a new probe with improved physiochemical properties and broad-spectrum antiviral activity against influenza strains
H. Alex Brown
The following profiles may or may not be the same professor: