PROTEOLYTIC ENZIMES: PROPERTIES, STRUCTURE AND FUNCTION
Main researcher
: VITALE, LJUBINKA (52520) Assistants
VUKELIĆ, BOJANA (74300)
ŠIMAGA, ŠUMSKI (46714)
ABRAMIĆ, MARIJA (22)
DRAŽIĆ, MENSURA (10576)
MOĆAN, SANJA (181196)
ŠKRTIĆ, IVAN (170093)
Type of research: basic Duration from: 01/01/91. to 12/31/95. Papers on project (total): 23
Papers on project quoted in Current Contents: 6
Institution name: Institut "Ruđer Bošković", Zagreb (98) Department/Institute: Department of Organic Chemistry and Biochemistry Address: Bijenička c. 54, City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (41) 424-987
Fax: 385 (41) 425-647
Summary: (1) To broaden the knowledge of proteolytic enzymes systems
in human blood cells and to elucidate the role of aminopeptidases, the
properties, localization and structure of these enzymes will be studied. In
particular, aminopeptidases which prefer arginine and those which prefer
methionine at the NH2-end of the substrate will be investigated. The
enzymes will be purified and characterized as catalysts and protein
molecules as well. Further, their distribution in different tissues and
cells and within the cell itself will be followed. Thus, aminopeptidases
localization with respect to different types of polymorphonuclear leukocyte
granules will be determined and concomitantly the granules better defined.
Enzymes from different sources will be compared. (2) Proteolytic and other
hydrolytic enzymes from industrial microorganism Streptomyces rimosus will
also be studied. Procedures for their isolation will be designed, and their
properties and partial structure determined. Immunochemical assay for
determination of relatedness of the same type enzymes from different
strains and species of streptomycetes will be developed, and its
applicability for taxonomy of these bacteria evaluated. (3) As a part of
the project a care for establishing a facility for determination of the
primary structure of proteins and peptides was foreseen (instrument,
running conditions, stuff training). The facility would be available to all
those in Croatia who have a need for determination of amino acids
sequences.
Research goals: One of the project aims is to determine a number and
type of enzymes responsible for the aminopeptidase activities found in
human blood cells, to determine their properties and specificity and to
establish to which subcellular compartment a particular aminopeptidase is
confined. Further, to determine relatedness of aminopeptidases from
different cells and their distribution among other tissues. For better
understanding of structure - mechanism of action relation, first a partial
and later on a complete primary structure of one of the isolated enzymes
will be determined, providing necessary facilities will be available. The
research should result with new data about aminopeptidases and their
physiological role, about blood cells and their differentiation, and in
particular about the function of polymorphonuclear leukocyte granules. For
microbial enzymes the aim is to find a suitable preparation procedure, to
evaluate their application possibility and to elaborate an immunochemical
method for determination of some of peptidases and other hydrolases, which
could at the same time diferentiate strains and species of streptomycetes.
For one of the enzymes isolated from S. rimosus partial primary structure
on protein and on gene level would be determined, hoping to get an insight
into its postsynthetic modifications. The new data on hydrolytic enzymes
and on streptomycetes are expected, whereas the procedures for isolation
and determination of enzymes might have a practical value. The aim of the
project is also a development of methods for separation and analysis of
proteins in general.
COOPERATION - INSTITUTIONS
Name of institution
: Odsek za biokemijo in molekularno biologijo
Institut "Jožef Stefan" Type of institution: University/Faculty City: 61000 - Ljubljana, Slovenija