- Steven Block
Dr. Steven M. Block (born 1952) is a professor at
Stanford University with a joint appointment in the departments of Biological Sciences and Applied Physics. In addition, he is a member of the scientific advisory groupJASON , a senior fellow of Stanford'sFreeman Spogli Institute for International Studies , and an amateur bluegrass musician. Block received his B.A. and M.A. fromOxford University . He has been elected to the U.S. National Academy of Sciences (2007) and theAmerican Academy of Arts and Sciences (2000), and is a winner of theMax Delbruck Prize [http://www.aps.org/programs/honors/prizes/delbruck.cfm] of theAmerican Physical Society (2008), as well as the Single Molecule Biophysics Prize of theBiophysical Society (2007). He served as President of the Biophysical Society during 2005-6. His graduate work was completed in the laboratory ofHoward Berg at the University of Colorado andCaltech . He received his Ph.D. in 1983 and went on to do postdoctoral research at Stanford. Since that time, Block has held positions at theRowland Institute for Science ,Harvard University , andPrinceton University before returning to Stanford in 1999.As a graduate student, Block picked apart the
adaptation kinetics involved in bacterialchemotaxis . As an independent scientist, Block has pioneered the use ofoptical tweezers , a technique developed byArthur Ashkin , to study biological enzymes and polymers at the single-molecule level. Work in his lab has led to the direct observation of the 8-m steps taken bykinesin [ Svoboda K, Schmidt CF, Schnapp BJ, Block SM, [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=8413650&query_hl=1&itool=pubmed_docsum "Direct observation of kinesin stepping by optical trapping interferometry"] , Nature. 1993 Oct 21; 365: 721-726. ] and the sub-nanometer stepping motions ofRNA polymerase on aDNA template [ Abbondanzieri E, Greenleaf WJ, Shaevitz JW, Landick R, Block SM [http://www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=16284617&ordinalpos=2&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum. "Direct observation of base-pair stepping by RNA polymerase"] , Nature. 2005 Nov. 24; 438: 460-465. ] . While consulting for the United States government throughJASON , Block has researched the many threats associated with bioterrorism and headed influential studies on how advances in genetic engineering have impacted biological warfare.Work in his lab has led to the direct observation of the 8-m steps taken by kinesin [3] and the demonstration that these steps consume as fuel only a single molecule of adenosine triphosphate (ATP),up to applied loads on the motor enzyme of several picoNewtons (pN) [4] .
References
[3] Schnitzer MJ, Block SM. (1997) Kinesin hydrolyses one ATP per 8-m step. Nature. 388(6640):386-90.
[4] Visscher K, Schnitzer MJ, Block SM. (1999) Single kinesin molecules studied with a molecular force clamp. Nature. 400(6740):184-9.
External links
* [http://www.stanford.edu/group/blocklab/ Blocklab Home Page]
* [http://scienceday.llnl.gov/Bios/block.htm Scienceday profile]
* [http://www.americanscientist.org/articles/01articles/Block.html Bioterrorism article]
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