Genetic and molecular characterizations of hydrogenases and sulfate metabolism proteins of Desulfovibrio vulgaris Miyazaki F [Elektronische Ressource] / vorgelegt von Amrit Pal Kaur

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• Biologie

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• Publié par: heinrich-heine-universitat_dusseldorf
• Publié le: 01 janvier 2009
• Nombre de lectures: 19
• Langue: Deutsch
• Poids de l'ouvrage: 12 Mo

Extrait

Genetic and Molecular Characterizations of
Hydrogenases and Sulfate Metabolism Proteins of
Desulfovibrio vulgaris Miyazaki F
Inaugural-Dissertation
zur Erlangung des Doktorgrades
der Mathematisch-Naturwissenschaftlichen Fakultät
der Heinrich-Heine-Universität Düsseldorf
vorgelegt von
Amrit Pal Kaur
aus Amritsar (Indien)
Düsseldorf, January 2009Zusammenfassung
Der hier untersuchte Organismus Desulfovibrio vulgaris Miyazaki F (DvMF) ist seit langem
bekannt auf Grund detaillierter Untersuchungen an seiner [NiFe] Hydrogenase und an Sulfat-
Stoffwechselproteinen sowie einiger anderer Metallo-Enzyme, die in Zusammenhang mit den
Hydrogenasen stehen. Unabhängig von den relativ guten Ausbeuten, die man für diese Proteine
erzielt, ist die funktionale und genetische Manipulation schwierig, da die Sequenzen der
kodierenden Gene nicht bekannt waren sind. In dieser Arbeit wurden genetische und
molekularbiologische Fortschritte erzielt und weitere Informationen über den Stoffwechsel der
Hydrogenasen von DvMF erhalten. Das gesamte Genom von DvMF wurde in eine Cosmid-Bank
kloniert. Die Verwendung von dioxygenin-markierten DNA-Sonden aus bekannten homologen
D. vulgaris Hildenborough (DvH) führte zur Identifizierung der gesuchten Gene.Sequenzen von
Sie kodieren zwei zusätzliche Hydrogenasen, eine aus zwei Untereinheiten bestehende [NiFeSe]
Hydrogenase (hysA und hysB) und eine sechs Untereinheiten große Ech Hydrogenase (echA -
echF). Zusätzlich wurden die Gensequenzen für fünf „Maturierungs“-Proteine aufgeklärt (hypA -
hypF). Diese Methode wurde auch angewandt auf die Gene von Proteinen des
Sulfatmetabolismus, 5'-Adenylyl Sulfatreduktase (aprA und aprB) und Desulfoviridin (dsvA,
dsvB, dsvD und DsvC). Ein weiteres wichtiges Ergebnis ist der eindeutige Nachweis, dass ein
[FeFe] Hydrogenase-kodierendes Gen in DvMF nicht vorhanden ist. Methodisch wurden
sämtliche Gene sequenziert, indem mittels degenerierter "primer" aus identifizierten,
konservierten Genbereichen heraus sequenziert wurde. Die Gene der [NiFe] - und der [NiFeSe] -
Hydrogenasen wurden zusammen mit den Maturierungsgenen Epitop-getaggt. Die Verwendung
von E. coli als Wirtszelle mit einem T7-Promotor Expressionsvektor ergab die Reinigung von
Strep-getaggter [NiFe] Hydrogenase, die Integration von Selenocystein in die [NiFeSe]
Hydrogenase und die gleichzeitige Expression von zwei-Gen operons (hypAB und hypDE).
Hiermit wurden wichtige Fortschritte hin zu einer heterologen Expression von physiologisch
aktiven Hydrogenasen erzielt. Zusätzlich zu den Untersuchungen an Hydrogenasen konnten in
gemeinsamer Arbeit die Protein-Komplexe der 5'-Adenylyl-sulfatreduktase und von
Desulfoviridin gereinigt und kristallisiert werden. Regulatorische Sequenzen der Gene wurden
mit verschiedenen Programmen detektiert, ebenfalls wurden dreidimensionale Modelle für die
Proteine generiert und eine phylogenetische Analyse durchgeführt.Abstract
The studied organism Desulfovibrio vulgaris Miyazaki F (DvMF) has long been known from
detailed investigations of its [NiFe] hydrogenase, of its proteins involved in sulfate metabolism
proteins and of some other metallo-enzymes associated with hydrogenases. Although the yields
of such proteins from DvMF are high, the functional and genetic manipulations have been a
daunting task due to non-availability of the sequences of the coding genes. In this work, genetic
and molecular biological advances have been made to add on information on hydrogenase
metabolism of DvMF. The entire genome of DvMF was cloned into a cosmid genomic library.
Probing by means of dioxygenin-labeled DNA probes derived from the known homologous
sequences of Desulfovibrio vulgaris Hildenborough (DvH) led to the identification of several
genes of focus. These genes included two additional hydrogenases, a two subunit [NiFeSe]
hydrogenase (hysA and hysB) and a six subunit Ech hydrogenase (echA, echB, echC, echD, echE
and echF), as well as five maturation genes hypA, hypB, hypD, hypE and hypF. This method was
extended to sequence the genes coding for the sulfate metabolism proteins 5’-adenylyl sulfate
reductase (aprA and aprB) and desulfoviridin (dsvA, dsvB, dsvD and dsvC). The presence of an
[FeFe] hydrogenase could be ruled out. All of the identified genes were sequenced by designing
degenerate primes from the conserved domains. The [NiFe]- and [NiFeSe]- hydrogenases along
with maturation gene operons were epitope tagged by means of PCR and cloning. Using E. coli
as a host along with a T7 promoter expression vector, the purification of strep-tagged [NiFe]
hydrogenase, integration of selenocysteine into the [NiFeSe] hydrogenase and the simultaneous
expression of two-gene operons (hypAB and hypDE) of hyp maturation genes happened to be
significant observations for advancing in the direction of heterologous expression and
modification of hydrogenases in physiological functional forms. In addition to the work aiming
at hydrogenases, the protein complexes of 5’-adenylyl sulfate reductase and desulfoviridin were
purified and crystallized in a collaborative effort. Using various software, the possible regulatory
sequences for the sequenced genes, the three dimensional models for the translated proteins and
the phylogenetic analysis based on amino acid sequence conservation were also successfully
performed.Curriculum Vitae
Personal Information
Name Amrit Pal Kaur
Birth Date 9th Oct., 1978
Birth place Amritsar, India
Education
1993 Basic Schooling
th1995 12 standard (Physics, Chemistry, Biology)
1996-1999 Bachelors of Science (Industrial Microbiology) at G.N.D university,
Amritsar, India.
1999-2001 Masters of Science (Biotechnology) at G.N.D university, Amritsar, India.
2000 Two months summer training research ‘’Molecular diversity analysis in
Capsicum annuum using RAPD and AFLP profiling of morphological
variants’’ carried under supervision of Dr. S. P. S. Khanuja at CIMAP,
Lucknow, India.
2001 Master thesis ‘’Glutamate Excitotoxicity: Its correlation with neuronal
plasticity in adult rats’’ carried under supervision of Prof. G Kaur, at
G.N.D university, Amritsar, India.
08-12/2002 Research work ‘’Deletion of chromosome 3p14.2-p25 involving the VHL
and FHIT genes in conventional renal cell carcinoma’’ carried under
supervision of Prof. G Kovacs at R.K. Universität, Heidelberg, Germany.
2003-2004 Research work ‘Transcriptional fusions of regulatory sequences of lipase
of Pseudomonas aeruginosa with GFP (green fluorescent protein) carried
under supervision of Prof. K.E. Jäger, at IMET, FZ-Jülich, Germany.
07/2004-present Working on doctoral thesis ‘‘Genetic and Molecular Characterizations of
Hydorgenases and Sulfate metabolism proteins of Desulfovibrio vulgaris
Miyazaki F’’ under supervision of Prof. W. Gärtner, at MPI-BAC,
Mülheim a.d. Ruhr, GermanyPublications
Kaur G., Basu A., and Kaur A.P. (2003) Glutamate Excitotoxicity: Its Correlation with
Neuronal Plasticity in Young Adult and Neonate Rats. Journal of Neurological Sciences,
20(4:40)
Sukosad F., Kuroda N., Beothe T., Kaur A. P., and Kovacs G. (2003) Deletion of
Chromosome 3p14.2-p25 involving the VHL and FHIT genes in Conventional renal carcinoma.
Cancer Res. 63(2), 455-457.
In this work
Ogata, H., Goenka Agrawal, A., Kaur, A. P., Goddard, R., Gärtner, W., and Lubitz W.
(2008) Purification, crystallization and preliminary X-ray analysis of adenylylsulfate reductase
from Desulfovibrio vulgaris Miyazaki F. Acta. Cryst., 64(11), 1010-1012.Acknowledgement
I would like to extend my sincere gratitude to Prof. Dr. Wolfgang Gärtner for giving me the
opportunity to work in his group and providing an excellent guidance for carrying this doctoral
thesis research on hydrogenases. I am thankful for his insightful inputs and for getting a very
liberal working environment where it was possible to learn new things and apply own ideas.
Prof. Gärtner gave an indispensible help to edit and organize the scientific content of this thesis
as well as improving the grammar. His help was again needed to translate the English text of the
presented abstract to Deutsch language. I am equally thankful to Prof. Dr. Wolfgang Lubitz for
arranging the basic and auxiliary funding of this project and for his constant interest in the
development of the molecular biology of the hydrogenases at MPI-BAC, Mülheim an der Ruhr. I
am also grateful to Prof. Dr. Karl-Erich Jäger, who has agreed to co-evaluate my thesis.
I am thankful to Dr. Hideaki Ogata and Dr. Aruna Goenka Agrawal for fruitful collaborations
over purification and crystallization of APS reductase and desulfoviridin proteins. I am also
thankful to Dr. Aruna Goenka Agrawal for providing a [NiFe] hydrogenase deletion mutant of
Desulfovibrio vulgaris subsp Hildenborough.
I am grateful to Dr. Marcus Ludwig of (Department of Biology) Humboldt University, Berlin,
for teaching me to perform hydrogenase activity assays. At the same time, I wish to thank Dr.
Oliver Lenz of the same institute for sharing his experience with the molecular biology of
Ralstonia eutropha H16. It has been very kind of Dr. Inês C. Pereira of ITQB, Portugal for
providing the purified [NiFeSe] hydrogenase protei