Investigation of coiled-coil interactions between proteins of the spindle pole body

The spindle pole body (SPB) is a large multi-protein complex that organizes microtubules in yeast. Through its function of nucleating and anchoring microtubules, the SPB is essential for cell viability. High-resolution structures of the SPB have not been achieved using x-ray crystallography, due to its low copy number, large size, heterogeneous composition, and association with the nuclear membrane. However, structural information may be deciphered through a variety of other techniques. Cryo-electron microscopy images have provided a low-resolution model of the SPB. Experiments testing which proteins interact provide additional structural data, although in most cases, it is not known precisely how these interactions occur. Interestingly, a large proportion of SPB proteins are predicted to contain one or more coiled coils. The coiled coil is a common protein-protein interaction domain, consisting of two or more supercoiled [alpha]-helices. The high frequency of coiled coils predicted in SPB proteins suggests that this structure may be important for establishing the overall architecture of the complex. This thesis describes work towards determining whether coiled coils form interactions within or between SPB proteins. All coiled-coil regions predicted in SPB proteins were produced and tested for interactions as individual peptides, taking advantage of the often-observed ability of coiled coils to fold and interact cooperatively, isolated from the rest of the protein. Many self-associating coiled coils and several hetero-associating coiled coils were identified, and structural features of several complexes were determined.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Biology.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2010

Author dc:creator

• Zizlsperger, Nora (Nora A. E.)

Advisor dc:contributor.advisor

• Amy E. Keating.

• Biology.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/57519

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/57519