Nikolay G Kolev, PhD
Research Scientist in Epidemiology (Microbial Diseases)Cards
About
Research
Publications
2025
Deep mutational scanning of the Trypanosoma brucei developmental regulator RBP6 reveals an essential disordered region influenced by positive residues
Rojas-Sánchez S, Kolev N, Tschudi C. Deep mutational scanning of the Trypanosoma brucei developmental regulator RBP6 reveals an essential disordered region influenced by positive residues. Nature Communications 2025, 16: 1168. PMID: 39885181, PMCID: PMC11782513, DOI: 10.1038/s41467-025-56553-y.Peer-Reviewed Original ResearchConceptsN-terminal intrinsically disordered regionRNA binding protein 6RNA recognition motifDeep mutational scanningMutational scanningDisordered regionsProtein-RNA interactionsIntrinsically disordered regionsComplex developmental programPositively charged residuesSingle-point variantsProtein-RNARNA recognitionDeleterious mutationsMutational constraintsProcyclic formsAnimal African trypanosomiasisTrypanosoma bruceiCharged residuesPrimary structureRegained infectivityDevelopmental programRegulatory roleProtein 6Positive residues
2019
The vault RNA of Trypanosoma brucei plays a role in the production of trans-spliced mRNA
Kolev NG, Rajan KS, Tycowski KT, Toh JY, Shi H, Lei Y, Michaeli S, Tschudi C. The vault RNA of Trypanosoma brucei plays a role in the production of trans-spliced mRNA. Journal Of Biological Chemistry 2019, 294: 15559-15574. PMID: 31439669, PMCID: PMC6816085, DOI: 10.1074/jbc.ra119.008580.Peer-Reviewed Original ResearchConceptsTelomerase-associated protein 1Vault RNAY RNAsRNA quality controlRNA polymerase IIISmall nuclear RNATrans-spliced mRNAPermeabilized cell systemNcRNA repertoireRNP biogenesisMRNA metabolismRNA speciesSequence similarityRNA classesMammalian cellsNuclear RNAPolymerase IIIRo functionTrypanosoma bruceiVtRNAsGene expressionRo proteinBloodstream formsRNACell nuclei
2018
Temperature shift activates bloodstream VSG expression site promoters in Trypanosoma brucei
Kolev NG, Ramsdell TK, Tschudi C. Temperature shift activates bloodstream VSG expression site promoters in Trypanosoma brucei. Molecular And Biochemical Parasitology 2018, 226: 20-23. PMID: 30399391, PMCID: PMC6258174, DOI: 10.1016/j.molbiopara.2018.10.003.Peer-Reviewed Original Research
2017
The proteome and transcriptome of the infectious metacyclic form of Trypanosoma brucei define quiescent cells primed for mammalian invasion
Christiano R, Kolev NG, Shi H, Ullu E, Walther TC, Tschudi C. The proteome and transcriptome of the infectious metacyclic form of Trypanosoma brucei define quiescent cells primed for mammalian invasion. Molecular Microbiology 2017, 106: 74-92. PMID: 28742275, PMCID: PMC5607103, DOI: 10.1111/mmi.13754.Peer-Reviewed Original ResearchConceptsInfectious metacyclic formsTsetse fly vectorMetacyclic formsVariant surface glycoprotein expression sitesQuiescent cellsGene expression profilesFly vectorsAvailability of nutrientsMammalian invasionsCell surface componentsCell divisionProcyclic trypanosomesMammalian hostsTrypanosoma bruceiMRNA sequencingExpression profilesExpression sitesMetabolic enzymesBloodstream formsInfectious metacyclicsProtein 6TranscriptomeTsetse fliesProteomeProtein levelsMetacyclic VSG expression site promoters are recognized by the same general transcription factor that is required for RNA polymerase I transcription of bloodstream expression sites
Kolev NG, Günzl A, Tschudi C. Metacyclic VSG expression site promoters are recognized by the same general transcription factor that is required for RNA polymerase I transcription of bloodstream expression sites. Molecular And Biochemical Parasitology 2017, 216: 52-55. PMID: 28716719, PMCID: PMC5582990, DOI: 10.1016/j.molbiopara.2017.07.002.Peer-Reviewed Original ResearchConceptsBloodstream VSG expression sitesVSG expression sitesVSG ES promoterExpression sitesPol IVSG genesES promoterRNA polymerase I transcriptionGeneral transcription factorsBloodstream expression sitesVariant surface glycoprotein (VSG) coatPolymerase I transcriptionRNA polymerase IDistinct promoter sequencesMetacyclic VSG geneTrypanosoma brucei cellsProcyclin genesTypes of promotersBrucei cellsDevelopmental programDistinct binding affinitiesTranscription factorsI transcriptionInitiation factorsPromoter sequencesThe Canonical Poly (A) Polymerase PAP1 Polyadenylates Non-Coding RNAs and Is Essential for snoRNA Biogenesis in Trypanosoma brucei
Chikne V, Gupta SK, Doniger T, K. SR, Cohen-Chalamish S, Ben-Asher HW, Kolet L, Yahia NH, Unger R, Ullu E, Kolev NG, Tschudi C, Michaeli S. The Canonical Poly (A) Polymerase PAP1 Polyadenylates Non-Coding RNAs and Is Essential for snoRNA Biogenesis in Trypanosoma brucei. Journal Of Molecular Biology 2017, 429: 3301-3318. PMID: 28456523, DOI: 10.1016/j.jmb.2017.04.015.Peer-Reviewed Original ResearchConceptsNon-coding RNAsPoly (ADP-ribose) polymeraseUnique RNA processing mechanismsCis-spliced intronsRNA processing mechanismsSmall nucleolar RNAsLong non-coding RNAsPolyadenylation of mRNAParasite Trypanosoma bruceiSnoRNA biogenesisTrans splicingPrecursor snoRNASnoRNA processingNucleolar RNAsPAP1Trypanosoma bruceiPolyadenylationMajor substrateSnoRNAsTrypanosoma cruziPAP2RNAPolymerase Pap1TrypanosomesCausative agent
2016
Transcriptome Profiling of Trypanosoma brucei Development in the Tsetse Fly Vector Glossina morsitans
Savage AF, Kolev NG, Franklin JB, Vigneron A, Aksoy S, Tschudi C. Transcriptome Profiling of Trypanosoma brucei Development in the Tsetse Fly Vector Glossina morsitans. PLOS ONE 2016, 11: e0168877. PMID: 28002435, PMCID: PMC5176191, DOI: 10.1371/journal.pone.0168877.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsElectron Transport Complex IVGene Expression ProfilingGene LibraryHigh-Throughput Nucleotide SequencingInsect VectorsIntestinal MucosaLife Cycle StagesMembrane GlycoproteinsProtozoan ProteinsProventriculusSalivary GlandsSequence Analysis, RNATranscriptomeTrypanosoma brucei bruceiTsetse FliesUp-RegulationConceptsSalivary gland transcriptomeMetacyclic VSGsInsect vectorsHigh-throughput RNA sequencingBlood-feeding tsetse fliesDigenetic life cycleRNA-binding proteinGene ontology analysisAlanine-rich proteinCytochrome oxidase complexTsetse fliesMidgut transcriptomeGlobal regulatorDNA metabolismTrypanosome developmentOntology analysisDNA replicationSignal transductionTransporter familyMammalian hostsRNA sequencingDistinct tissuesTranscript levelsTranscriptomeRich protein
2015
Genome-wide analysis of small nucleolar RNAs of Leishmania major reveals a rich repertoire of RNAs involved in modification and processing of rRNA
Eliaz D, Doniger T, Tkacz ID, Biswas VK, Gupta SK, Kolev NG, Unger R, Ullu E, Tschudi C, Michaeli S. Genome-wide analysis of small nucleolar RNAs of Leishmania major reveals a rich repertoire of RNAs involved in modification and processing of rRNA. RNA Biology 2015, 12: 1222-1255. PMID: 25970223, PMCID: PMC4829279, DOI: 10.1080/15476286.2015.1038019.Peer-Reviewed Original ResearchConceptsSmall nucleolar RNAsNucleolar RNAsGenome-wide analysisRNA processing mechanismsRRNA secondary structurePost-transcriptional levelCore proteinProcessing of rRNARNA-seq analysisFunctional homologueGene clusterRNA speciesTrypanosoma bruceiSnoRNAsComplete repertoireGene expressionRRNA cleavageAnalogous functionsSecondary structureRNAProtozoan parasiteRich repertoireOrganismsSpeciesProteinSynchronous expression of individual metacyclic variant surface glycoprotein genes in Trypanosoma brucei
Ramey-Butler K, Ullu E, Kolev NG, Tschudi C. Synchronous expression of individual metacyclic variant surface glycoprotein genes in Trypanosoma brucei. Molecular And Biochemical Parasitology 2015, 200: 1-4. PMID: 25896436, PMCID: PMC4470760, DOI: 10.1016/j.molbiopara.2015.04.001.Peer-Reviewed Original ResearchConceptsVariant surface glycoproteinMetacyclic variant surface glycoproteinInfectious metacyclic formsVariant surface glycoprotein genesVSG gene expressionSurface glycoprotein genesNew mammalian hostInsect vectorsParasite biologyMammalian hostsDifferentiation systemGene expressionTsetse vectorBloodstream trypanosomesDifferential expressionGlycoprotein geneProtein 6Molecular aspectsIndividual cellsMetacyclic formsBlood mealProtein levelsDiscrete populationsSurface glycoproteinLife cycle
2014
Construction of Trypanosoma brucei Illumina RNA-Seq Libraries Enriched for Transcript Ends
Kolev NG, Ullu E, Tschudi C. Construction of Trypanosoma brucei Illumina RNA-Seq Libraries Enriched for Transcript Ends. Methods In Molecular Biology 2014, 1201: 165-175. PMID: 25388113, DOI: 10.1007/978-1-4939-1438-8_9.Peer-Reviewed Original ResearchConceptsHuman pathogen Trypanosoma bruceiHigh-throughput RNA sequencingLong polycistronic precursorsGenome-wide scaleIllumina RNA-seqPathogen Trypanosoma bruceiRNA polymerase IIRNA-seq librariesSingle-nucleotide resolutionTranscript endsTranscript boundariesTranscriptome annotationUnannotated genesPolymerase IICellular abundancePolycistronic precursorsTranscription initiationGene clusterRNA-seqPolyadenylation sitesRNA sequencingMRNA precursorsTrypanosoma bruceiRNA moleculesMRNA molecules
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- The vault RNA (vtRNA) of Trypanosoma brucei, the unicellular eukaryote causing African sleeping sickness, is shown set against an image of live procyclic form parasites in this cover photo for the October 25, 2019 issue of the Journal of Biological Chemistry.
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