The Mechanism of Dis2 Phosphorylation by Chk1 and Cell Cycle Dissertation

The Mechanism of Dis2 Phosphorylation by Chk1 and Cell Cycle Regulation - Dissertation Example PP1 and its role as a mitotic checkpoint xxxii 1.6. PP1 and cell cycle control xxxiv 1.7. Importance of regulatory subunits and their role in diseases xxxv 1.8. Human paralogues of Dis2 xli 1.9. Conclusion xliv Chapter 2 xlvii Materials and Methods xlvii 2.1. Preparation of media xlvii 2.2. Preparation of buffers xlviii 2.3. Preparation of stain l 2.4. Preparation of normal SDS-PAGE buffer and gels l 2.5. Preparation of PEMS solutions liii 2.6. Preparation of protein extracts for use in SDS-PAGE liv 2.7. Running of SDS-PAGE: lvii 2.8. Construction of yeast strains lviii 2.9. Preparation of membrane lx 2.10. Chk1-HA shift experiment lx 2.11. TCA protein extraction lxii 2.12. Immune localization of proteins in yeast cells lxiv 2.13. Drop test lxviii 2.14. Preparation of cells for imaging lxix 2.15. Acute cell survival lxxi Chapter 3 lxxiv Results lxxiv 3.1. Dephosphorylation of Chk1 at 40Â °C is not affected by Dis2 phosphatase lxxiv 3.2. Dephosphorylation of Hus1 at 40Â ° lxxviii 3. 3. Hypersensitivity to DNA damaging agent lxxxi 3.4. Structural changes to cells lxxxiv 3.5. Study on cell survival lxxxvi 3.6. Identification of hus1 isoforms xcii 3.7. Comparison of Dis2 with other proteins xciv Chapter 4 xcix Discussion xcix 4.1. Conclusion civ 5. Appendix cvi 5.1. Appendix – 1 Multiple sequence alignment of dis2 protein cvi 5.2. Appendix – 2 Alignment of dis2 from S. pombe with human protein serine/threonine phosphatase cviii 5.3. Appendix - 3 Significance sequence alignment of protein serine/threonine phosphatase-1 cxi Acknowledgment This thesis was made possible by the unrelenting support of my supervisors and peers. I thank the university and the department for providing me with the technical as well as educational support apart from laboratory facilities for carrying out this research. It has been a great pleasure to complete this thesis under the support and guidance of my professors. Hypothesis Chk1 kinase is phosphorylated at serine 345 in r esponse to DNA damage. Dis2 dephosphorylated this residue slowly when cells recover from a DNA damage-induced cell cycle arrest. A rise in temperature from 30Â °C to 40Â °C results in the rapid dephosphorylation of S345 by a yet unknown phosphatase. The purpose of this experiment is to investigate the requirement of Dis2 for the heat-induced phosphorylation and to investigate the cell cycle roles of this enzyme. Other phosphor-proteins such as Hus1 and Rad9 are also investigated. 1. Abstract Protein phosphatases are a group of enzymes which have very specific role in biological cell activities. Dis2 is a PP1 enzyme (serine-threonine phosphatase-1) which plays a key role in regulation of DNA damage signaling. Fission yeast Dis2 regulates the DNA damage respons by dephosphorylation of chk1 kinase at Ser 345. In eukaryotic cells, phosphorylation mainly occurs on three hydroxyl-containing amino acids, namely – serine, threonine, and tyrosine, of which serine is the predominant target. Dis2 dephosphorylates the DNA damage checkpoint kinase Chk1 (at Ser-345) to switch off the checkpoint signal. Interestingly, heat stress results in very rapid removal of the phosphate from Ser 345 by a yet unknown phosphatase. Given the requirement of Dis2 for the dephosphorylation of Ser 345 at the normal growth temperature of 30Â °C, this study was conducted to investigate the role of this phosphatase under heat stress condition modification of Ser 345 is easily detected as a band shift of the protein which changes from a closed, low activity conformation

Complete work Essay Example | Topics and Well Written Essays - 750 words

Complete work - Essay Example For the few women who owned businesses, and were married â€Å"in manu† (meaning their husbands were in control of them), the groom together with his family was in charge of all the woman’s possessions. This law prevented women from owning anything they earned with the inclusion of her inheritance and dowry (Kidner, 2014). Women almost had no say in the ‘manus’ marriage and what the husband said was the last word on all the matters. I believe that if the women were given the opportunity to own property in the manus marriage, their families would have benefited more, as there would be two providers. In politics, women could not support their husbands in privacy and not in the public. Their public role was to attend to the traditional activities of household chores. At home they could weave, spin yarn in order to make clothes for their families (Kidner, 2014). If women had a say in politics and even participated in things like voting, most of the empire probl ems would be unheard of and the empire governed in a much better way. Women were also made to think that their role was to sit pretty at home, nurture their children and heed to their husband's decisions. Unlike today's society, fathers chose husbands for their daughters and girls got married at the legal age of 12 years (Kidner, 2014). Fathers allowing their daughters to become of age and then get married to the men of their choice would have resulted in decreasing the number of divorces as well as sexual promiscuity. The male dominance in the Roman Empire was a great influence on how women led their lives. The men were the determinants of what was good or bad for the women. They suppressed the voice of the women who only had an option of doing that which their husbands or fathers demanded from them. Their opinions did not matter and therefore were in no way an influence to the social norms nor the political attributes in the empire. This did not stop the women but they raised high above the norms and laws and managed to change their world. This persuasive paper shows how women changed some of the social factors of the Roman Empire. Women in the Roman Empire may not have had any political office or any voting rights but made great contributions in religion. They did this amidst the fact that they could not stand for their rights. Women always had to serve under a male figure, be it a husband or a father. Men dominated in the social field and politics but the amazing thing is that they were not a great influence on religion. As it was customary, the women took care of the homestead’s shrines, altars, and offering daily prayers. They would perform the necessary rituals to keep the household gods appeased. The Romans believed that these gods, when women appeased them, would live in harmony with the family. The appeased spirits would protect the home and family from any harm and so the women had to pay attention to how well they kept the gods. However, thi s changed over time as women became goddesses and there are coins present in the empire that have images of these goddesses. Helena was the woman who saw it that Christianity was the foundation of the Roman Empire (Winter, 2003). The chauvinistic male society made it clear that only males would assess education. Women, as per

The ultimate achievemet of the Land Registration Act Essay

The ultimate achievemet of the Land Registration Act - Essay Example In analysing the practical ramifications of the LRA 2002, this paper will critically evaluate the procedural and substantive changes in the law on land registration as brought in by the LRA. Moreover, this paper will argue that a central issue in the evaluation of the LRA 2002 is whether property purchase post 2002 has become easier as intended by the extrapolations of the Law Commission Report7. A central issue of concern in contemporary conveyancing is the applicability of any third party â€Å"off the record† proprietary rights and to this end I shall undertake a contextual and comparative analysis with the unregistered system for enforceability of third party rights. Moreover, I shall further evaluate the system for enforceability of third party equitable rights under the registered land system post 2002. It is submitted at the outset that such an evaluation is vital to the overall consideration of the substantive and procedural changes brought about by the LRA in order to determine whether or not the LRA has in fact created a â€Å"rational legal order† as suggested. In assessing the extent of changes introduced by the LRA 2002, it is further necessary to consider the essential objectives of the Law Commission Report, particularly in terms of its hailing the LRA bill as a revolution for conveyancing practice8. Firstly, the Law Commission argued that the reforms proposed by the LRA were bold particularly in respect of the: â€Å"Move from a paper based system of conveyancing to one that is entirely electronic is a very major one and it will transform fundamentally the manner in which the process is conducted9.† Indeed, in the Law Commission Report, in addressing the fundamental objectives of the Bill, it asserts that â€Å"dispositions of... The system for protection of third party interests appears to remain intrinsically complex for purchasers notwithstanding the objectives of the LRA. Moreover, the above analysis demonstrates that it is incorrect to argue that the changes brought introduced by the LRA have automatically culminated in a rationale and simplified system of land registration with limited scope for off the record interests. Indeed, the complex rules of the LRA highlight that in reality, the extent to which a purchaser can be subject to third party interests will ultimately depend on the nature of the right. Additionally, the drafting of the LRA 2002 retains some the core provisions of the 1925 Land Registration Act, which effectively creates a dual system of protection. To this end, it is submitted that it is questionable whether the LRA 2002 has met the objectives extrapolated by the Law Commission, which is arguably a significant opportunity missed.

Legal Perspectives Essay Example | Topics and Well Written Essays - 1000 words

Legal Perspectives - Essay Example Under the doctrine, original owners retain ownership interest, although the salvage is entitled to a very liberal salvage award. However, when property is abandoned, the way the plane was in this situation, the owner gives up the reasonable expectation of privacy concerning it. The finder of abandoned property is entitled to keep it, and a police officer may take possession of abandoned property as evidence without violating the Fourth Amendment to the U.S. Constitution. As deciding factor Federal law may have been given the monopoly on a subject preempting the state laws, when the federal court must try the case, it will apply the laws of the state where the controversy happened. Do you think that Mr. Champlin should have consulted with the Navy before spending his time and money on this project Should he (or the general public for that matter) have known about this special rule regarding federal property Consider whether there should be a time limit or statute of limitations regarding the forfeiture or non-forfeiture of title. Also, consider whether property should be considered lost or abandoned by the failure to protect or attempt recovery of the property. Mr. Champlin should have consulted with the Navy first. If he had taken the proper steps in notifying the Navy of what he was doing, he might have had more rights to fight the Navy. If the Government would ensure the public knew about the rules of federal property, perhaps this might not have even been a case. A time statute should be in effect. If you look at the Estray Statues it says many states have enacted estray statues that give a finder of mislaid of lost property clear title to the property if certain requirements are met. The requirements are 1. Reporting the find to an appropriate government agency 2. Advertising the lost property 3. The owner not claiming the property within a stated time (e.g., one year). The finder acquires title to the property and is thereafter not required to return the property if the rightful owner appears to claim it (Cheeseman, 2003 pg 918). Since there are special rules that apply to federal property maybe this statues wouldn't have helped him. However, if he and the public were aware of the special rules he might have reconsidered doing the project in the first place. I think there should be a time limit regarding forfeiture or non-forfeiture of title. If the owner doesn't claim the property in a certain amount of time th

Parents play an essential role in the development of their child's Essay

Parents play an essential role in the development of their child's language.Discuss - Essay Example As Gordon Wells (1986) indicates, the entire function of learning language and interacting socially is geared toward making connections with other people as well as to help the individual make sense of their experiences. â€Å"Language occurs through an interaction among genes (which hold innate tendencies to communicate and be sociable), environment, and the child’s own thinking abilities† (Genishi, 2006). But just how does this happen? How do children learn to use sounds to communicate and then to place those sounds in the correct order to make themselves understood? While much of this behavior can be attributed to imitation of the caregivers, there remain aspects to the development of language and communication that cannot be so easily explained. To provide a more complete understanding of how language and communication develop in the young child, it is necessary to understand not only the primary terms that are applied, but also the parts and components that make up language. This helps to inform the various theories that have been developed relating to language development which then begins to identify how environmental aspects of the child’s world may contribute to the development of language and identify those strategies that are used to encourage language development. There are several terms used in a discussion of language development that may not be quite as obvious as they might seem at first glance. Generally speaking, language is defined as a set of symbols, typically in the form of articulatory gestures and the creation of sounds, which are used to communicate or store information (Eccardt, 2003). â€Å"The symbols are words, and their meanings cover everything we humans deal with †¦ Generally, the above definition puts the label ‘language’ on English, Spanish, Chinese, etc. It also covers sign languages for deaf people† (Eccardt, 2003).

Specific patients Case Management (Instruction Below, and patients Essay

Specific patients Case Management (Instruction Below, and patients info faxed) - Essay Example The presented complexity of health problems experienced by the patient is very similar to the case presented by Dr. Sheehan (2008) of Joslin Diabetes Center, Inc. where the case talks about a patient having type 2 diabetes, dyslipidemia, hypertension and all of the microvascular complications. There are essentially two primary defects in type 2 diabetes. One is insulin resistance. At the level of the liver, there is uncontrolled liver glucose output; in skeletal muscle, there is defective skeletal muscle glucose uptake, and nonoxidative glucose metabolism. There are defects in the adipocyte in terms of storing fat, excessive lipolysis, and high levels of free fatty acids in the circulation that can worsen insulin resistance. The adipose tissue can release inflammatory cytokines. Additionally, we have known for a great many years that there are defects in glucagon regulation at the level of the pancreas. The alpha cell, which makes glucagon, overproduces glucagon both in the fasting a nd the fed state. This is another major defect in type 2 diabetes (Sheehan, 2008). Long-term research has demonstrated the benefits of maintaining good control over blood glucose levels. The United Kingdom Prospective Diabetes Study (UKPDS) found that the diabetes-related complications of retinopathy, nephropathy, and neuropathy were reduced significantly in study subjects with type 2 diabetes who practiced intensive blood glucose control. In addition, for every percentage point reduction in A1C (a blood test that measures the three-month average of blood glucose levels), study participants achieved a 35% reduction in the risk of complications (American Diabetes Association, 2002). The best nursing theory applicable in this case is Dorothea Orem’s Self-Care Deficit theory. The theory essentially defines the need for nursing care. Since Mrs. X experiences some limitations or deficit which interferes with her ability to maintain self-care, she

Visual Arts and Film Studies Assignment Example | Topics and Well Written Essays - 1000 words

Visual Arts and Film Studies - Assignment Example I smiled at the answers I got and felt like nodding because, indeed, I see those things in myself as well. I will try to relay to you what they told me so far. Positivity. I was told that this is definitely one of my strongest characteristic. All three of my friends agreed that they feel lighter when they are around me. I was told that there were several times when they felt down due to a bad thing, and I would point out the good side of it and make them feel better. I know that most of the times, I see the brighter side of a dark situation. Individualization. My friends told me that I am one of those who hate stereotypes. They reminded me of the times when they would make generalized comments about a person based on fashion taste or circle of friends, and I would stand up for that person and insist that no one knows anything until we get to know that person well. I had been stereotyped a lot so probably that's why I hate to see it happening to anyone. Includer. I know that I have al ways been warm to everyone. My friends told me that I am always the one to invite a person to join a conversation, or an activity, etc. It makes me feel awkward to see anyone being left on the sides. I know that everyone has a potential and it makes me feel good to be the one to actually cause a person to show his or her skills in a group because of my welcoming attitude. Activator. My friends made me laugh on this one, because they told me they sometimes feel like having a hard time keeping up with my activities. I don't like dull moments and I always feel like there is still something better to do than just idle away. Developer. Friends say that if they ever need encouragement, they will just come looking for me. It is as if I know how they will best be able to flaunt their skills because of the ideas I give them. I like it a lot when people discover something in themselves, and I like it better when I know I am a part of that progress. 2. I feel that positivity is the overall cau se of all the other dominant themes of talent in me. I feel positive in me, for me, and for others, that I want everybody to act and feel the same. 3. I believe that being an activator develops most of the talents. This is because I always search for something new to do and learn. I always tap into the unknown, which I think is a good thing in loosening our imaginative freedom. I don't want to get stuck in something that is redundant, so I tend to be fearless in exploring and learning new things. 4. The surprising thing is how my friends see these dominant characteristics so well, and how they respond so positively to these. I never want to imagine that people see me as â€Å"overwhelming,† so it is nice to know that they enjoy my personality. 5. The talent that I want to develop more is â€Å"individualization† because I know that every person has their own qualities worth knowing about, and I would really like to be able to be one of those who makes a difference, and tap into those hidden talents that most other people choose to ignore and be prejudice about. However, I know that I need to work on my verbal interaction with people because despite these positive qualities, I know that there are still others who see me as just the quiet typical art student. II. Networking Event I went to a networking event, which is a screening of a short film entitled â€Å"Wallenda.† It is produced by RareForm pictures --- an independent film production company founded in 2009. The screening was held in Gnomon, last December 3, at around 7;00 p.m. The film is directed by V.W. Scheich, and written by V.W. Scheich and Uyen Le. You can find out more about the film at http://www.imdb.com/title/tt2094183/. I found out about