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1

Stereoselective synthesis of stable isotope-labeled L-α-amino acids: Chemomicrobiological synthesis of 13C- and 2H-labeled L-cysteine

Clifford J. Unkefer, John L. Hanners, Deborah S. Ehler

Journal:

Journal of Labelled Compounds and Radiopharmaceuticals

Year:

1991

Language:

english

File:

PDF, 284 KB

english, 1991

2

Stereoselective synthesis of stable isotope-labeled L-α-amino acids: Biosynthesis of 2H-, 13C-, and 15N-labeled L-serines

John Hanners, Rowena Gibson, Karen Velarde, Judy Hammer, Mark Alvarez, Janet Griego, Clifford J. Unkefer

Journal:

Journal of Labelled Compounds and Radiopharmaceuticals

Year:

1991

Language:

english

File:

PDF, 460 KB

english, 1991

3

Conformational changes on substrate binding revealed by structures of Methylobacterium extorquens malate dehydrogenase

González, Javier M., Marti-Arbona, Ricardo, Chen, Julian C.-H., Broom-Peltz, Brian, Unkefer, Clifford J.

Journal:

Acta Crystallographica Section F Structural Biology Communications

Year:

2018

Language:

english

File:

PDF, 1.90 MB

english, 2018

4

Stereoselective synthesis of L-[4-13C]carnitine

Clifford J. Unkefer, Deborah S. Ehler

Journal:

Journal of Labelled Compounds and Radiopharmaceuticals

Year:

1991

Language:

english

File:

PDF, 328 KB

english, 1991

5

Structure of Methylobacterium extorquens malyl-CoA lyase: CoA-substrate binding correlates with domain shift

González, Javier M., Marti-Arbona, Ricardo, Chen, Julian C.-H., Unkefer, Clifford J.

Journal:

Acta Crystallographica Section F Structural Biology Communications

Year:

2017

Language:

english

File:

PDF, 1.30 MB

english, 2017

6

Stereoselective Synthesis of Stable Isotope Labeled L-α-Amino Acids: Synthesis of L−[4−13C] and L−[3,4−13C2]Aspartic Acid

Siegfried N. Lodwig, Clifford J. Unkefer

Journal:

Journal of Labelled Compounds and Radiopharmaceuticals

Year:

1992

Language:

english

File:

PDF, 542 KB

english, 1992

7

Hydrogen-1 and carbon-13 nuclear magnetic resonance conformational studies of the His-Pro peptide bond: conformational behavior of TRH

CLIFFORD J. UNKEFER, ROBIN D. WALKER, ROBERT E. LONDON

Journal:

Chemical Biology & Drug Design

Year:

1983

Language:

english

File:

PDF, 479 KB

english, 1983

8

Excretion and Metabolism of 1-Nitropyrene in Rats after Oral or Intraperitoneal Administration

DUTCHER, JOHN S., SUN, JAMES D., BECHTOLD, WILLIAM E., UNKEFER, CLIFFORD J.

Journal:

Toxicological Sciences

Year:

1985

Language:

english

File:

PDF, 643 KB

english, 1985

9

Synthesis of tert-butyl-[1-13C]glycolic acid

Rodolfo A. Martinez, Louis A. Silks III, Clifford J. Unkefer

Journal:

Journal of Labelled Compounds and Radiopharmaceuticals

Year:

1999

File:

PDF, 147 KB

1999

10

Carbon-13 and nitrogen-15 nuclear magnetic resonance evidence of the ionization state of substrates bound to bovine dihydrofolate reductase

Selinsky, Barry S., Perlman, Michael E., London, Robert E., Unkefer, Clifford J., Mitchell, John, Blakley, Raymond L.

Journal:

Year:

1990

Language:

english

File:

PDF, 914 KB

english, 1990

11

The Synthesis of Carbon-13 Enriched Monosaccharides Derived from Glucose and Mannose

Walker, Thomas E., Unkefer, Clifford J., Ehler, Deborah S.

Journal:

Journal of Carbohydrate Chemistry

Year:

1988

Language:

english

File:

PDF, 782 KB

english, 1988

12

Joint neutron crystallographic and NMR solution studies of Tyr residue ionization and hydrogen bonding: Implications for enzyme-mediated proton transfer

Michalczyk, Ryszard, Unkefer, Clifford J., Bacik, John-Paul, Schrader, Tobias E., Ostermann, Andreas, Kovalevsky, Andrey Y., McKenna, Robert, Fisher, Suzanne Zoë

Journal:

Proceedings of the National Academy of Sciences

Year:

2015

Language:

english

File:

PDF, 1.03 MB

english, 2015

13

Troponin I Inhibitory Peptide (96−115) Has an Extended Conformation When Bound to Skeletal Muscle Troponin C †

Hernández, Griselda, Blumenthal, Donald K., Kennedy, Michael A., Unkefer, Clifford J., Trewhella, Jill

Journal:

Year:

1999

Language:

english

File:

PDF, 92 KB

english, 1999

14

Stereoselective Synthesis and X-Ray Structure Determination of Labeled [1, 2, 3-13C3]-1-(Phenylsulfinyl)-3-Benzyloxyacetone

Ernest M. Asani, Victor N. Khrustalev, Rachel M. Williamson, Rodolfo A. Martinez, Clifford J. Unkefer, Tatiana V. Timofeeva

Journal:

Journal of Chemical Crystallography

Year:

2007

Language:

english

File:

PDF, 342 KB

english, 2007

15

Molecular hydrogen complexes of the transition metals. 7. Kinetics and thermodynamics of the interconversion between dihydride and dihydrogen forms of W(CO)3(PR3)2H2 where R = isopropyl and cyclopentyl

Khalsa, G. Rattan K., Kubas, Gregory J., Unkefer, Clifford J., Van der Sluys, Lori Stepan, Kubat-Martin, Kimberly A.

Journal:

Journal of the American Chemical Society

Year:

1990

Language:

english

File:

PDF, 828 KB

english, 1990

16

Studies on the Biosynthesis of Paraherquamide A. Origin of the β-Methylproline Ring J. Am. Chem. Soc. 1996 , 118 , 7008−7009

Stocking, Emily M., Sanz-Cervera, Juan F., Williams, Robert M., Unkefer, Clifford J.

Journal:

Journal of the American Chemical Society

Year:

1997

Language:

english

File:

PDF, 122 KB

english, 1997

17

Large-scale preparation of 13 C-labeled 2-(phenylthio)acetic acid and the corresponding labeled sulfoxides and sulfones

Martinez, Rodolfo A., Glass, David R., Ortiz, Erick G., Alvarez, Marc A., Juarez, Ernesto, Lodwig, Siegfried N., Unkefer, Clifford J.

Journal:

Journal of Labelled Compounds and Radiopharmaceuticals

Year:

2013

Language:

english

File:

PDF, 284 KB

english, 2013

18

SINGLE CELL ENDOCRINOLOGY: ANALYSIS OF P-450scc ACTIVITY BY FLUORESCENCE DETECTION METHODS

Marrone, Babetta L., Simpson, Daniel J., Yoshida, Thomas M., Unkefer, Clifford J., Whaley, Thomas W., Buican, Tudor N.

Journal:

Year:

1991

Language:

english

File:

PDF, 375 KB

english, 1991

19

Neutron diffraction studies towards deciphering the protonation state of catalytic residues in the bacterial KDN9P phosphatase

Bryan, Tyrel, González, Javier M., Bacik, John P., DeNunzio, Nicholas J., Unkefer, Clifford J., Schrader, Tobias E., Ostermann, Andreas, Dunaway-Mariano, Debra, Allen, Karen N., Fisher, S. Zoë

Journal:

Acta Crystallographica Section F Structural Biology and Crystallization Communications

Year:

2013

Language:

english

File:

PDF, 536 KB

english, 2013

20

The CFTA Method: A Reliable Procedure for the Determination of the Absolute Configuration of Chiral Primary Amines by 1H NMR Spectroscopic Analysis

Yoshio Takeuchi, Masaru Segawa, Hidehito Fujisawa, Kenji Omata, Siegfried N. Lodwig, Clifford J. Unkefer

Journal:

Angewandte Chemie International Edition

Year:

2006

Language:

english

File:

PDF, 146 KB

english, 2006

21

Direct Infrared Detection of the Covalently Ring Linked His−Tyr Structure in the Active Site of the Heme−Copper Oxidases †

Tomson, Farol, Bailey, James A., Gennis, Robert B., Unkefer, Clifford J., Li, Zizhong, Silks, Louis A., Martinez, Rodolfo A., Donohoe, Robert J., Dyer, R. Brian, Woodruff, William H.

Journal:

Year:

2002

Language:

english

File:

PDF, 119 KB

english, 2002

22

A Comprehensive Approach for Accurate Measurement of Proton–Proton Coupling Constants in the Sugar Ring of DNA

Jiping Yang, Kathleen McAteer, Louis A.“Pete” Silks, Ruilian Wu, Nancy G Isern, Clifford J Unkefer, Michael A Kennedy

Journal:

Journal of Magnetic Resonance

Year:

2000

Language:

english

File:

PDF, 348 KB

english, 2000

23

PQQ: Biosynthetic studies inMethylobacteriumAM1 andHyphomicrobiumX using specific13C labeling and NMR

David R. Houck, John L. Hanners, Clifford J. Unkefer, Mario A. G. Kleef, Johannis A. Duine

Journal:

Antonie van Leeuwenhoek

Year:

1989

Language:

english

File:

PDF, 461 KB

english, 1989

24

Biosynthesis of pyrroloquinoline quinone. 1. Identification of biosynthetic precursors using carbon-13 labeling and NMR spectroscopy

Houck, David R., Hanners, John L., Unkefer, Clifford J.

Journal:

Journal of the American Chemical Society

Year:

1988

Language:

english

File:

PDF, 300 KB

english, 1988

25

A reinvestigation of the synthesis of [15N2]hydroxymethylimidazole: Useful in an improved synthesis of (D,L)-[τ,π-15N2]histidine

Louis A. Silks III, Erik Dunkle, Clifford J. Ünkefer, James L. Sudmeier, Michael Butler, William W. Bachovchin

Journal:

Journal of Labelled Compounds and Radiopharmaceuticals

Year:

1995

Language:

english

File:

PDF, 297 KB

english, 1995

26

The use of stable isotope labelling for the analytical chemistry of drugs

Clifford J. Unkefer, Rodolfo A. Martinez

Journal:

Drug Testing and Analysis

Year:

2012

Language:

english

File:

PDF, 198 KB

english, 2012

27

Synthesis of the First Examples of Transition Metal .eta.2-SiH4 Complexes, cis-Mo(.eta.2-SiH4)(CO)(R2PC2H4PR2)2, and Evidence for an Unprecedented Tautomeric Equilibrium between an .eta.2-SiH4 Complex and a Hydridosilyl Species: A Model for Methane Coordination and Activation

Luo, Xiao-Liang, Kubas, Gregory J., Burns, Carol J., Bryan, Jeffrey C., Unkefer, Clifford J.

Journal:

Journal of the American Chemical Society

Year:

1995

Language:

english

File:

PDF, 302 KB

english, 1995

28

Biosynthesis of the antibiotic thiostrepton. Methylation of tryptophan in the formation of the quinaldic acid moiety by transfer of the methionine methyl group with net retention of configuration

Zhou, Pei, O'Hagan, David, Mocek, Ursula, Zeng, Zhaopie, Yuen, Lai Duien, Frenzel, Thomas, Unkefer, Clifford J., Beale, John M., Floss, Heinz G.

Journal:

Journal of the American Chemical Society

Year:

1989

Language:

english

File:

PDF, 357 KB

english, 1989

29

A combination of inadequate and carbon-13 saturation for spectral implification

Clifford J Unkefer, William L Earl

Journal:

Journal of Magnetic Resonance (1969)

Year:

1969

Language:

english

File:

PDF, 337 KB

english, 1969

30

Low-frequency single-crystal Raman, far-infrared, and inelastic neutron scattering studies of acetanilide at low temperature

Johnston, Clifford T., Agnew, Stephen F., Eckert, Juergen, Jones, Llewellyn H., Swanson, Basil I., Unkefer, Clifford J.

Journal:

Journal of Physical Chemistry

Year:

1991

Language:

english

File:

PDF, 707 KB

english, 1991

31

ChemInform Abstract: Studies on the Biosynthesis of Paraherquamide. Construction of the Amino Acid Framework.

Emily M. Stocking, Juan F. Sanz-Cervera, Clifford J. Unkefer, Robert M. Williams

Journal:

Year:

2001

File:

PDF, 26 KB

2001

32

Stereoselective synthesis of stable isotope-labeled L-α-amino acids: Chemomicrobiological synthesis of L-[β-13C]-, L-[2′-13C]-, and L-[1′15N]tryptophan

Clifford J. Unkefer, Siegfried N. Lodwig, Louis A. Silks III, John L. Hanners, Deborah S. Ehler, Rowena Gibson

Journal:

Journal of Labelled Compounds and Radiopharmaceuticals

Year:

1991

Language:

english

File:

PDF, 494 KB

english, 1991

33

Studies on the Biosynthesis of Paraherquamide A. Origin of the β-Methylproline Ring

Stocking, Emily M., Sanz-Cervera, Juan F., Williams, Robert M., Unkefer, Clifford J.

Journal:

Journal of the American Chemical Society

Year:

1996

Language:

english

File:

PDF, 204 KB

english, 1996

34

Producing Glucose 6-Phosphate from Cellulosic Biomass

Bacik, John-Paul, Klesmith, Justin R., Whitehead, Timothy A., Jarboe, Laura R., Unkefer, Clifford J., Mark, Brian L., Michalczyk, Ryszard

Journal:

Journal of Biological Chemistry

Year:

2015

Language:

english

File:

PDF, 3.28 MB

english, 2015

35

The CFTA Method: A Reliable Procedure for the Determination of the Absolute Configuration of Chiral Primary Amines by 1H NMR Spectroscopic Analysis

Yoshio Takeuchi, Masaru Segawa, Hidehito Fujisawa, Kenji Omata, Siegfried N. Lodwig, Clifford J. Unkefer

Journal:

Angewandte Chemie

Year:

2006

Language:

english

File:

PDF, 146 KB

english, 2006

36

In vivo screening of haloalkane dehalogenase mutants

Chia-Hwa Chang, John F. Schindler, Clifford J. Unkefer, Laura A. Vanderberg, James R. Brainard, Thomas C. Terwilliger

Journal:

Bioorganic & Medicinal Chemistry

Year:

1999

Language:

english

File:

PDF, 247 KB

english, 1999

37

Neutron structure and inelastic-neutron-scattering and theoretical studies of molybdenum complex Mo(CO)(H2)[(C6D5)2PC2H4P(C6D5)2]2.cntdot.4.5C6D6, a complex with an extremely low barrier to hydrogen rotation. Implications on the reaction coordinate for H-H cleavage to dihydride

Kubas, Gregory J., Burns, Carol J., Eckert, Juergen, Johnson, Susanna W., Larson, Allen C., Vergamini, Phillip J., Unkefer, Clifford J., Khalsa, G. R. K., Jackson, Sarah A., Eisenstein, Odile

Journal:

Journal of the American Chemical Society

Year:

1993

Language:

english

File:

PDF, 2.26 MB

english, 1993

38

A mechanism-based fluorogenic probe for the cytochrome P-450 cholesterol side chain cleavage enzyme

Simpson, Daniel J., Unkefer, Clifford J., Whaley, Thomas W., Marrone, Babetta L.

Journal:

Journal of Organic Chemistry

Year:

1991

Language:

english

File:

PDF, 813 KB

english, 1991

39

Molecular hydrogen complexes of the transition metals. 4. Preparation and characterization of M(CO)3(PR3)2(.eta.2-H2) (M = molybdenum, tungsten) and evidence for equilibrium dissociation of the H-H bond to give MH2(CO)3(PR3)2

Kubas, Gregory J., Unkefer, Clifford J., Swanson, Basil I., Fukushima, Eiichi.

Journal:

Journal of the American Chemical Society

Year:

1986

Language:

english

File:

PDF, 1.33 MB

english, 1986

40

Large-Scale Preparation of [ 13 C]Methyl Phenyl Sulfide from [ 13 C]Methanol by a One-Step Process

Martinez, Rodolfo A., Alvarez, Marc A., Velarde, Stephen P., Silks, Louis A. “Pete”, Stotter, Philip L., Schmidt, Jürgen G., Unkefer, Clifford J.

Journal:

Organic Process Research & Development

Year:

2002

Language:

english

File:

PDF, 132 KB

english, 2002

41

Poly(γ -glutamylcysteinyl)glycine: Its Role in Cadmium Resistance in Plant Cells

Paul J. Jackson, Clifford J. Unkefer, Jane A. Doolen, Ken Watt and Nigel J. Robinson

Journal:

Proceedings of the National Academy of Sciences

Year:

1987

Language:

english

File:

PDF, 912 KB

english, 1987

42

Molecular hydrogen complexes. 5. Electronic control of .eta.2-H2 vs. dihydride coordination. Dihydride structure of MoH2(CO)(R2PC2H4PR2)2 for R = Et, iso-Bu versus .eta.2-H2 for R = Ph

Kubas, Gregory J., Ryan, R. R., Unkefer, Clifford J.

Journal:

Journal of the American Chemical Society

Year:

1987

Language:

english

File:

PDF, 970 KB

english, 1987

43

Synthesis of 1-chloro-1-[15N]nitrosocyclohexane, an electrophilic aminating reagent

Siegfried N. Lodwig, Louis A. Silks III, Clifford J. Unkefer

Journal:

Journal of Labelled Compounds and Radiopharmaceuticals

Year:

1996

Language:

english

File:

PDF, 331 KB

english, 1996

44

ChemInform Abstract: Synthesis of Stable Isotope Labeled Nucleic Acids and Carbohydrates

Ryszard Michalczyk, Zizhong Li, Charles C. Orji, Ruilian Wu, Rodolfo A. Martinez, Clifford J. Unkefer, L. A. Pete Silks

Journal:

Year:

2000

File:

PDF, 25 KB

2000

45

Synthesis of 2-deoxy-d-arabino-(6-13C)hexose

Thomas E. Walker, Deborah S. Ehler, Clifford J. Unkefer

Journal:

Carbohydrate Research

Year:

1988

Language:

english

File:

PDF, 667 KB

english, 1988

46

Neutron and atomic resolution X-ray structures of a lytic polysac-charide monooxygenase reveal copper-mediated dioxygen binding and evidence for N-terminal deprotonation

Bacik, John-Paul, Mekasha, Sophanit, Forsberg, Zarah, Kovalevsky, Andrey Y., Vaaje-Kolstad, Gustav, Eijsink, Vincent G.H., Nix, Jay C., Coates, Leighton, Cuneo, Matthew J., Unkefer, Clifford J, Chen,

Journal:

Year:

2017

Language:

english

File:

PDF, 544 KB

english, 2017

47

The assignment of carbonyl resonances in 13C-N.M.R. spectra of peracetylated mono- and oligo-saccharides containing d-glucose and d-mannose: An alternative method for structural determination of complex carbohydrates

Warren J. Goux, Clifford J. Unkefer

Journal:

Carbohydrate Research

Year:

1987

Language:

english

File:

PDF, 1.22 MB

english, 1987

48

Carbon-13 and proton NMR analysis of isotopically labeled benzo[a]pyrenes

Unkefer, Clifford J., London, Robert E., Whaley, Thomas W., Daub, Guido H.

Journal:

Journal of the American Chemical Society

Year:

1983

Language:

english

File:

PDF, 386 KB

english, 1983

49

CD-n.m.r. study of the solution conformation of bradykinin analogs containing α-aminoisobutyric acid

JOHN R. CANN, ROBERT E. LONDON, CLIFFORD J. UNKEFER, RAYMOND J. VAVREK, JOHN M. STEWART

Journal:

Chemical Biology & Drug Design

Year:

1987

Language:

english

File:

PDF, 704 KB

english, 1987

50

Determination of Lysine pK Values Using [5- 13 C]Lysine: Application to the Lyase Domain of DNA Pol β

Gao, Guanghua, Prasad, Rajendra, Lodwig, Siegfried N., Unkefer, Clifford J., Beard, William A., Wilson, Samuel H., London, Robert E.

Journal:

Journal of the American Chemical Society

Year:

2006

Language:

english

File:

PDF, 72 KB

english, 2006

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