2BW9

Laue Structure of L29W MbCO

Summary for 2BW9

• Entry DOI: 10.2210/pdb2bw9/pdb
• Related: 101M 102M 103M 104M 105M 106M 107M 108M 109M 110M 111M 112M 1A6G 1A6K 1A6M 1A6N 1ABS 1AJG 1AJH 1BVC 1BVD 1BZ6 1BZP 1BZR 1CH1 1CH2 1CH3 1CH5 1CH7 1CH9 1CIK 1CIO 1CO8 1CO9 1CP0 1CP5 1CPW 1CQ2 1DO1 1DO3 1DO4 1DO7 1DTI 1DTM 1DUK 1DUO 1DXC 1DXD 1EBC 1F63 1F65 1F6H 1FCS 1H1X 1HJT 1IOP 1IRC 1J3F 1J52 1JDO 1JP6 1JP8 1JP9 1JPB 1JW8 1L2K 1LTW 1LUE 1MBC 1MBD 1MBI 1MBN 1MBO 1MCY 1MGN 1MLF 1MLG 1MLH 1MLJ 1MLK 1MLL 1MLM 1MLN 1MLO 1MLQ 1MLR 1MLS 1MLU 1MOA 1MOB 1MOC 1MOD 1MTI 1MTJ 1MTK 1MYF 1MYM 1MYZ 1MZ0 1N9F 1N9H 1N9I 1N9X 1NAZ 1O16 1OBM 1OFJ 1OFK 1SPE 1SWM 1TES 1UFJ 1UFP 1VXA 1VXB 1VXC 1VXD 1VXE 1VXF 1VXG 1VXH 1WVP 1YOG 1YOH 1YOI 2BLH 2BLI 2BLJ 2CMM 2MB5 2MBW 2MGA 2MGB 2MGC 2MGD 2MGE 2MGF 2MGG 2MGH 2MGI 2MGJ 2MGK 2MGL 2MGM 2MYA 2MYB 2MYC 2MYD 2MYE 2SPL 2SPM 2SPN 2SPO 4MBN 5MBN
• Descriptor: MYOGLOBIN, PROTOPORPHYRIN IX CONTAINING FE, CARBON MONOXIDE, ... (4 entities in total)
• Functional Keywords: oxygen transport, myoglobin mutant l29w, l29w mbco, laue crystallography
• Biological source: PHYSETER CATODON (SPERM WHALE)
• Total number of polymer chains: 1
• Total formula weight: 17951.52

Authors

Schmidt, M.,Nienhaus, K.,Pahl, R.,Krasselt, A.,Anderson, S.,Parak, F.,Nienhaus, G.U.,Srajer, V. (deposition date: 2005-07-13, release date: 2005-07-13, Last modification date: 2023-12-13)

Primary citation

Schmidt, M.,Nienhaus, K.,Pahl, R.,Krasselt, A.,Anderson, S.,Parak, F.,Nienhaus, G.U.,Srajer, V.
Ligand Migration Pathway and Protein Dynamics in Myoglobin: A Time-Resolved Crystallographic Study on L29W Mbco.
Proc.Natl.Acad.Sci.USA, 102:11704-, 2005

PubMed Abstract: By using time-resolved x-ray crystallography at room temperature, structural relaxations and ligand migration were examined in myoglobin (Mb) mutant L29W from nanoseconds to seconds after photodissociation of carbon monoxide (CO) from the heme iron by nanosecond laser pulses. The data were analyzed in terms of transient kinetics by fitting trial functions to integrated difference electron density values obtained from select structural moieties, thus allowing a quantitative description of the processes involved. The observed relaxations are linked to other investigations on protein dynamics. At the earliest times, the heme has already completely relaxed into its domed deoxy structure, and there is no photo-dissociated CO visible at the primary docking site. Initial relaxations of larger globin moieties are completed within several hundred nanoseconds. They influence the concomitant migration of photo-dissociated CO to the Xe1 site, where it appears at approximately 300 ns and leaves again at approximately 1.5 ms. The extremely long residence time in Xe1 as compared with wild-type MbCO implies that, in the latter protein, the CO exits the protein from Xe1 predominantly via the distal pocket. A well-defined deligated state is populated between approximately 2 micros and approximately 1 ms; its structure is very similar to the equilibrium deoxy structure. Between 1.5 and 20 ms, no CO is visible in the protein interior; it is either distributed among many sites within the protein or has escaped to the solvent. Finally, recombination at the heme iron occurs after >20 ms.

PubMed: 16085709
DOI: 10.1073/PNAS.0504932102

Experimental method

X-RAY DIFFRACTION (1.68 Å)