Navigation Links
Postcards from the photosynthetic edge
Date:7/9/2014

phy of the Mn4Ca ion in action but the molecule is highly sensitive to radiation. The LCLS is the world's only source of x-rays capable of providing femtosecond pulses at the high intensities that allow intact photosystem II crystals to be imaged before they are destroyed by exposure to the x-ray beams.

"In an earlier study at the LCLS, we reported combined XRD and XES data from photosystem II samples in the dark S1 state and the one visible-flash illuminated S2 (1-flash) state," says Junko Yano, a chemist also with Berkeley Lab's Physical Biosciences Division and also a leader of this research. "In this new study we report data from the S3 (2-flash) and S0 (3-flash) states, which are the intermediate states directly before and after the evolution of the oxygen molecule. In addition, we report data for the first time from a light-induced transient state between the S3 and S0 states, which opens the window for elucidating the mechanism of oxygen-oxygen bond formation that occurs between these two states."

XRD data of all the flash states studied revealed an anomalous diffraction signal from Mn that is not complicated by signals from the overall protein matrix of carbon, nitrogen, oxygen and other metals, or even by the Ca atom, which is a part of the five atom Mn4Ca metalloenzyme complex.

"The detection of this anomalous Mn scattering signal not only validates the quality of our data, but also the procedures used for analyzing the data," says computational scientist Nicholas Sauter. Sauter and Paul Adams, both with Berkeley Lab's Physical Biosciences Division and both contributors to this study, are leading an effort to develop methods for analyzing data from the LCLS.

Yachandra and Yano believe that the detection of an anomalous Mn scattering signal opens up the possibility for detecting changes pertaining only to the Mn cluster as it advances through the S-state cycles and the oxygen-oxygen bond formation, which is where the ca
'/>"/>

Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Scientists stitch up photosynthetic megacomplex
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Postcards from the photosynthetic edge
(Date:9/29/2014)... research team says recently identified radiation detection properties of ... doors for homeland security and medical advances. , In ... issue of Optics Letters , UT Arlington Physics ... method to fabricate transparent nanoscintillators by heating nanoparticles composed ... is formed. A scintillator refers to a material ...
(Date:9/29/2014)... has presented Dr. Cristin Samper, president and CEO ... Order of San Carlos. , The Order of ... military officers who have made outstanding contributions to ... relations. , An international authority on conservation biology ... the Colombian Residence in New York to receive ...
(Date:9/29/2014)... annual Advocacy Awards will ... advancing medical progress to improve the health and ... take place on Wednesday, March 11, 2015, at ... , The 2015 Advocacy Award winners are ABC,s ... founder of the Milken Institute and FasterCures; Dr. ...
Breaking Biology News(10 mins):UT Arlington researchers develop new transparent nanoscintillators for radiation detection 2UT Arlington researchers develop new transparent nanoscintillators for radiation detection 3Research!America to honor leaders in medical and health research advocacy 2Research!America to honor leaders in medical and health research advocacy 3Research!America to honor leaders in medical and health research advocacy 4
... warming despite emitting small amounts of an important greenhouse gas, ... of Edinburgh suggests that plant leaves account for less than ... is considered to be about 25 times more effective than ... a previous scientific study which had suggested that plants were ...
... WASHINGTON, April 29, 2010 The American Chemical ... has awarded its 2010 research grant to Scottish ... strides in expanding green chemistry and engineering practices ... the one-year $150,000-grant to further his study of ...
... Thomas Miller , an internationally recognized expert at ... and genetics, has been chosen by the U.S. Department ... Fellowship . Miller is one of only ten ... applicants undergo a rigorous selection process, are highly accomplished ...
Cached Biology News:ACS Green Chemistry Institute Pharmaceutical Roundtable award goes to Scottish chemist 2US Department of State names UCR entomologist a Jefferson Science Fellow 2US Department of State names UCR entomologist a Jefferson Science Fellow 3
(Date:9/30/2014)... September 30, 2014 Rainbow Scientific, ... research products, recently opened an online store to ... culture product lines developed and manufactured by Biological ... store include Biological Industries’ Nutristem® serum-free, xeno-free reagents ... embryonic stem cell (hESC) culture. , The ...
(Date:9/30/2014)... Whitehouse Laboratories is pleased to ... Parenteral Drug Association (PDA) to host a unique ... closure integrity testing. This lecture/laboratory course will examine the ... detailed in the recently proposed revision to USP 1207 ... will span container closure integrity testing (leak testing) critical ...
(Date:9/29/2014)... 30, 2014 Each year in ... require medical attention. In the military, burn injury ... to battlefield medical care. More than 800 service ... Burn wounds heal slowly, remain inflamed and often ... physically debilitating and functionally damaging. While developments in ...
(Date:9/29/2014)... BEACH, Va. , Sept. 29, 2014 /PRNewswire-USNewswire/ ... from the fields of cartilage repair, regeneration, allograft ... attendees from around the world gathered to discuss ... LifeNet Health Institute of Regenerative Medicine symposium, ... Direction . Topics included Orthopedic Biosurgery, Minced Juvenile ...
Breaking Biology Technology:Rainbow Scientific, Inc. opens online store for state-of-the-art stem cell culture and cytogenetic reagents 2Whitehouse Laboratories to Partner with PDA for Educational Course on Container Closure Integrity Testing 2Whitehouse Laboratories to Partner with PDA for Educational Course on Container Closure Integrity Testing 3Whitehouse Laboratories to Partner with PDA for Educational Course on Container Closure Integrity Testing 4Faster Healing with Fewer Scars 2World Renowned Experts Discuss Future Of Cartilage Regeneration 2World Renowned Experts Discuss Future Of Cartilage Regeneration 3
... Organization Exceeds Expectations, MEMPHIS, Tenn., Nov. ... exclusively focused on oncology, announced today that ... as the company continues,to experience banner growth. ... to consistently exceed client expectations, and we ...
... N.J., Nov. 10 Aton Pharma, Inc., ... a recent,survey of ophthalmologists regarding issues in ... dry eye. Aton provides the dry eye ... sustained release prescription insert that helps to ...
... 3SBio Inc. (Nasdaq:,SSRX), a leading biotechnology company focused ... in China,today announced that it has filed with ... approval of NuLeusin for the treatment of late,stage ... expected to,be the only treatment of this kind ...
Cached Biology Technology:ACORN CRO Continues Growth in Strong Third Quarter 2Dry Eye Survey: Ophthalmologists Cite Treatment Limitations/Gaps in Treatment of Moderate to Severe Dry Eye 2Dry Eye Survey: Ophthalmologists Cite Treatment Limitations/Gaps in Treatment of Moderate to Severe Dry Eye 3Dry Eye Survey: Ophthalmologists Cite Treatment Limitations/Gaps in Treatment of Moderate to Severe Dry Eye 4Dry Eye Survey: Ophthalmologists Cite Treatment Limitations/Gaps in Treatment of Moderate to Severe Dry Eye 53SBio Inc. Files for SFDA Approval of NuLeusin 23SBio Inc. Files for SFDA Approval of NuLeusin 33SBio Inc. Files for SFDA Approval of NuLeusin 4