Ullrich Keller

3.2k total citations
70 papers, 2.4k citations indexed

About

Ullrich Keller is a scholar working on Molecular Biology, Pharmacology and Organic Chemistry. According to data from OpenAlex, Ullrich Keller has authored 70 papers receiving a total of 2.4k indexed citations (citations by other indexed papers that have themselves been cited), including 49 papers in Molecular Biology, 47 papers in Pharmacology and 16 papers in Organic Chemistry. Recurrent topics in Ullrich Keller's work include Microbial Natural Products and Biosynthesis (35 papers), Chemical Synthesis and Analysis (23 papers) and Plant and fungal interactions (14 papers). Ullrich Keller is often cited by papers focused on Microbial Natural Products and Biosynthesis (35 papers), Chemical Synthesis and Analysis (23 papers) and Plant and fungal interactions (14 papers). Ullrich Keller collaborates with scholars based in Germany, France and Spain. Ullrich Keller's co-authors include Rainer Zocher, Horst Kleinkauf, Florian Schauwecker, Paul Tudzynski, Nicolas Grammel, Joachim Vater, Frank Pfennig, Hans von Döhren, Wilhelm Schlumbohm and Ivana Crnovčić and has published in prestigious journals such as Chemical Reviews, Journal of the American Chemical Society and Journal of Biological Chemistry.

In The Last Decade

Ullrich Keller

69 papers receiving 2.3k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Ullrich Keller Germany 28 1.4k 1.2k 523 469 364 70 2.4k
Tanetoshi Koyama Japan 30 3.0k 2.2× 1.1k 0.9× 57 0.1× 366 0.8× 193 0.5× 120 3.3k
Robert Finking Germany 10 1.2k 0.9× 930 0.8× 61 0.1× 231 0.5× 275 0.8× 11 1.7k
Mamoru Komatsu Japan 22 1.6k 1.2× 1.3k 1.1× 107 0.2× 217 0.5× 205 0.6× 45 2.2k
A. Ballio Italy 29 1.1k 0.8× 549 0.5× 214 0.4× 235 0.5× 1.4k 3.8× 103 2.4k
Linquan Bai China 34 2.3k 1.7× 2.2k 1.8× 68 0.1× 745 1.6× 524 1.4× 161 3.5k
John C. Gebler United States 32 2.5k 1.9× 171 0.1× 113 0.2× 364 0.8× 139 0.4× 63 3.9k
J. Ribas Spain 32 1.7k 1.3× 243 0.2× 93 0.2× 481 1.0× 978 2.7× 72 2.9k
Per Olof Nyman Sweden 30 2.1k 1.6× 441 0.4× 38 0.1× 287 0.6× 618 1.7× 74 3.0k
César Sánchez United States 18 1.3k 1.0× 1.2k 1.0× 64 0.1× 648 1.4× 127 0.3× 51 2.2k
Hideaki Oikawa Japan 45 4.5k 3.3× 4.3k 3.5× 284 0.5× 2.3k 4.8× 719 2.0× 230 7.5k

Countries citing papers authored by Ullrich Keller

Since Specialization
Citations

This map shows the geographic impact of Ullrich Keller's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Ullrich Keller with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ullrich Keller more than expected).

Fields of papers citing papers by Ullrich Keller

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ullrich Keller. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Ullrich Keller. The network helps show where Ullrich Keller may publish in the future.

Co-authorship network of co-authors of Ullrich Keller

This figure shows the co-authorship network connecting the top 25 collaborators of Ullrich Keller. A scholar is included among the top collaborators of Ullrich Keller based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Ullrich Keller. Ullrich Keller is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Crnovčić, Ivana, et al.. (2017). Genetic interrelations in the actinomycin biosynthetic gene clusters of Streptomyces antibioticus IMRU 3720 and Streptomyces chrysomallus ATCC11523, producers of actinomycin X and actinomycin C. SHILAP Revista de lepidopterología. 6 indexed citations
2.
3.
Crnovčić, Ivana, Joachim Vater, & Ullrich Keller. (2013). Occurrence and biosynthesis of C-demethylactinomycins in actinomycin-producing Streptomyces chrysomallus and Streptomyces parvulus. The Journal of Antibiotics. 66(4). 211–218. 17 indexed citations
4.
Vogel, Dominik, et al.. (2013). Cyclolization of D-Lysergic Acid Alkaloid Peptides. Chemistry & Biology. 21(1). 146–155. 44 indexed citations
5.
Keller, Ullrich, et al.. (2009). Phosphinothricin-tripeptide biosynthesis: An original version of bacterial secondary metabolism?. Phytochemistry. 70(15-16). 1787–1800. 18 indexed citations
6.
Haarmann, Thomas, et al.. (2006). Identification of the Cytochrome P450 Monooxygenase that Bridges the Clavine and Ergoline Alkaloid Pathways. ChemBioChem. 7(4). 645–652. 57 indexed citations
7.
Schmoock, Gernot, Frank Pfennig, Wilhelm Schlumbohm, et al.. (2004). Functional Cross-talk between Fatty Acid Synthesis and Nonribosomal Peptide Synthesis in Quinoxaline Antibiotic-producing Streptomycetes. Journal of Biological Chemistry. 280(6). 4339–4349. 35 indexed citations
8.
Grammel, Nicolas, et al.. (2003). Molecular Cloning and Analysis of the Ergopeptine Assembly System in the Ergot Fungus Claviceps purpurea. Chemistry & Biology. 10(12). 1281–1292. 79 indexed citations
9.
Keller, Ullrich & Florian Schauwecker. (2001). Nonribosomal biosynthesis of microbial chromopeptides. Progress in nucleic acid research and molecular biology. 70. 233–289. 11 indexed citations
10.
Schauwecker, Florian, Frank Pfennig, Nicolas Grammel, & Ullrich Keller. (2000). Construction and in vitro analysis of a new bi-modular polypeptide synthetase for synthesis of N-methylated acyl peptides. Chemistry & Biology. 7(4). 287–297. 47 indexed citations
11.
Pfennig, Frank, Florian Schauwecker, & Ullrich Keller. (1999). Molecular Characterization of the Genes of Actinomycin Synthetase I and of a 4-Methyl-3-hydroxyanthranilic Acid Carrier Protein Involved in the Assembly of the Acylpeptide Chain of Actinomycin in Streptomyces. Journal of Biological Chemistry. 274(18). 12508–12516. 38 indexed citations
12.
Walzel, Bernd, et al.. (1997). Mechanism of alkaloid cyclopeptide synthesis in the ergot fungus Claviceps purpurea. Chemistry & Biology. 4(3). 223–230. 56 indexed citations
13.
Keller, Ullrich, et al.. (1996). D-Lysergyl Peptide Synthetase from the Ergot Fungus Claviceps purpurea. Journal of Biological Chemistry. 271(44). 27524–27530. 58 indexed citations
14.
Keller, Ullrich. (1995). Peptidolactones. Elsevier eBooks. 28. 173–196. 2 indexed citations
15.
Keller, Ullrich, et al.. (1994). Epimerization of the D-Valine Portion in the Biosynthesis of Actinomycin D. Biochemistry. 33(31). 9358–9364. 34 indexed citations
16.
Zocher, Rainer, Ullrich Keller, Chan Lee, & Kai Hoffmann. (1992). A seventeen kilodaltons peptidyl-prolyl cis-trans isomerase of the cyclosporin-producer Tolypocladium inflatum is sensitive to cyclosporin A.. The Journal of Antibiotics. 45(2). 265–268. 11 indexed citations
17.
Pahl, Andreas, Monika Ühlein, Holger Bang, Wilhelm Schlumbohm, & Ullrich Keller. (1992). Streptomycetes possess peptidyl‐prolyl cis‐trans isomerases that strongly resemble cyclophilins from eukaryotic organisms. Molecular Microbiology. 6(23). 3551–3558. 27 indexed citations
18.
19.
Zocher, Rainer, Andreas Billich, Ullrich Keller, & Paul Messner. (1988). Destruction of Ethidium Bromide in Solution by Ozonolysis. Biological Chemistry Hoppe-Seyler. 369(2). 1191–1194. 6 indexed citations
20.
Keller, Ullrich, et al.. (1988). D-Lysergic acid activation and cell-free synthesis of D-lysergyl peptides in an enzyme fraction from the ergot fungus Claviceps purpurea. Biochemistry. 27(16). 6164–6170. 22 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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